DT1 Manual

DT1 DATA SHEET

INTRODUCTION

As a leading manufacturer of smart function modules, NAI offers over 100 different modules that cover a wide range of I/O, measurements and simulation, communications, Ethernet switch, and SBC functions. Our standard function (SF) discrete I/O multichannel smart function modules provide interfacing solutions for almost embedded or test application due to their unparalleled programming flexibility, wide range of operating characteristics, and a unique design that eliminates the need for pull-up resistors or mechanical jumpers. This user manual is designed to help you get the most out of our discrete I/O smart function modules.

DT1 Overview

NAI’s DT1 module offers a range of features designed to suit a variety of system requirements, including:

24 Channels of Programmable Discrete Input/Output: The DT1 module features 24 channels programmable for either discrete input or output that provide the following:

Input - voltage or contact sensing with programmable, pull-up/pull-down current sources, eliminating the need for external resistors or mechanical jumpers.
Output - programmable current source (high-side), sink (low-side) or push-pull switching up to 500 mA per channel from an applied 3- 60V external VCC source (or sink to ISO-GND).

Current Sharing: The module enables current sharing* by connecting multiple outputs in parallel, capable of sinking or sourcing up to 2A per bank, enhancing your system’s capacity and reliability.

(*) Current Share: The maximum output load per-channel is ±0.5A. Channels can be connected and operated in parallel to provide > 0.5A to act as a single channel. The load current between paralleled channels cannot be effectively characterized and is not expected to be equal due to factors including:

Channel/bank position, module position, motherboard/system platform configuration, operating temperature range including external application/configuration influences (e.g., external cabling).

Therefore, when operating in shared current (parallel channel) configuration, it is recommended to de-rate the per-channel maximum current output to at least 66% (or 333 mA/channel) to ensure that no single channel is overburdened by handling most of the load current.

For example: If the maximum continuous load current is expected to be 1A: 1/0.33 ≅ 3 channels (minimum).

Inrush Current Handling: The DT1 module can efficiently handle high inrush current loads, such as connecting two #327 incandescent lamps in parallel, without compromising performance.

Dual Turn-On Application Support: The module supports ‘dual turn-on’ applications, such as dual series ‘key’ missile launch control, providing seamless control in critical operations.

Debounce Circuitry: Programmable debounce circuitry with selectable time delay eliminates false signals caused by relay contact bounce, ensuring accurate data acquisition.

Background Built-In-Test (BIT): All channels have continuous background Built-In-Test (BIT), which provides real-time channel health to ensure reliable operation in mission-critical systems. This feature runs in the background and is transparent in normal operations.

Input Diagnostics: The DT1 module can sense broken input connections and detect if inputs are shorted to +V or ground, allowing for early detection and troubleshooting.

Voltage and Current Readings: The module offers the ability to read I/O voltage and output current, facilitating improved diagnostics and load status identification (indicates if load is connected).

PRINCIPLE OF OPERATION

DT1 provides up to 24 individual digital I/O channels with BIT fault detection, which enables flagging of non-compliant outputs or inconsistent input readings between dual input measurements.

When channels are programmed as inputs, they can be used for either voltage or contact sensing. Channels set for contact sensing (e.g., sensing a relay contact position; OPEN-CLOSED) can be configured with a programmable “pull-up” or “pull-down” (current source or sink) which effectively provides the proper voltage level change to sense the open state of the contact. This unique design eliminates the need for external resistors or mechanical jumpers. Instead, this design offers a current source/sink (in banks of 6 channels) that the user programs to a desired current (0-5 mA) level.

When programmed as outputs, each channel can be set for high-side current-source), low-side (current-sink) or push-pull (current-source-sink) operation. The load impedance determines the delivered switched output current drive - up to 500 mA per channel. Diode clamping is provided (useful for inductive loads, such as relays) and thermal protection.

Overcurrent protection is implemented using current sensing technology. When the current exceeds a programmed threshold of 650 mA steady state, or a higher short duration, the overcurrent/short-circuit protection is triggered, shutting down the output drivers for safety. The overcurrent fault status will be indicated for the affected channels and will require a reset operation to restore output. To reset this condition, a reset command needs to be issued to the Overcurrent Reset register, which will restore drive output and allow the latched status to be reset. This is separate from the reset for the Overcurrent Interrupt Enable register on this module. It is recommended that a reset command is done whenever status is cleared to avoid a non-apparent output reset condition.

The 24 channels are configured as 4 banks of 6 channels. Each bank is provided with a separate external input VCC and a ground return (GND) pin. The GND pins are common within the module but are isolated from system (power) GND.

Operational requirements/assumptions:

An external source VCC supply must be wired for proper:
- Output operation as a current source..
- Input operation when requiring a programmed pull-up current (i.e., programmed “pull-up” for input contact sense; OPEN/GND detect/state change).
An external source Ground/Return must be wired for all I/O configurations. The Ground/Return must be the input signal or the load current sink ground/reference.

Input/Output Interface

Each channel can be configured as an input or one of three types of outputs.

Output

When configured as an output, the interface can act as a “High-Side”, “Low-Side” or “Push-Pull” drive, providing up to 500 mA per channel or 1 A when two channels are connected in parallel. The total output per module is 8 A (2 A per bank).

Note

Maximum source current ‘rules’ for rear I/O connectors still apply - see specifications.

Input

When configured as an input, output drivers are disabled. The I/O interface can act as a constant current source, current sink or voltage sensing circuit. For contact sensing, each channel may be set for pull-up or pull-down using the Select Pull-Up or Pull-Down register and by entering the appropriate current level in the Pull-Up/Down Current register. Contact closure and hysteresis may be defined using the Upper Voltage and Lower Voltage Threshold registers. No additional resistors or hardware are required to provide for current flow. A current value of zero disables the current source/sink circuits and configures the module for voltage sensing. Default is voltage sensing. Level or contact sensing can be mixed within a channel bank, if the contact sensing channels are externally pulled up or pulled down.

Note

If this module supplies the current for the contact sensing, then level and contact sensing cannot be mixed within a channel bank.

All four threshold levels must be programmed in monotonic, increasing order of: Minimum Low, Lower, Upper and Maximum High. For input and output, threshold levels define logic state. For output, threshold levels are used in BIT test (wrap-around) signal monitoring. A pair of drive FETs and current circuits are provided at each I/O pin. See the functional representation of the drivers in the I/O Circuits interface diagram below.

Input/Output Circuits

Discrete Input/Output Voltage Threshold Programming

Four threshold levels: Max High Voltage Threshold, Upper Voltage Threshold, Lower Voltage Threshold, and Min Low Voltage Threshold offer maximum user flexibility. All four threshold levels must be programmed. For input or output, the threshold levels will define the logic states. For proper operation, the threshold values should be programmed such that:

Max High Voltage Threshold > Upper Voltage Threshold > Lower Voltage Threshold > Min Low Voltage Threshold

Program Upper and Lower Voltage Thresholds, keeping the 0.25 V min. differential in mind, and then add debounce time as required. When the input signal exceeds the Upper Voltage Threshold, a logic high 1 is maintained until the input signal falls below the Lower Voltage Threshold. Conversely, when the input signal falls below the Lower Voltage Threshold, a logic low 0 is maintained until the input signal rises above the Upper Voltage Threshold.

Debounce Programming

The Debounce register, when programmed for a non-zero value, is used with channels programmed as input to “filter” or “ignore” expected application spurious initial transitions. Once a signal level is a logic voltage level period longer than the Debounce Time (Logic High and Logic Low), a logic transition is validated. Signal pulse widths less than programmed Debounce Time are filtered. Once valid, the transition status register flag is set for the channel and the output logic changes state.

Automatic Background Built-In Test (BIT)/Diagnostic Capability

The Discrete module supports automatic background BIT testing that verifies channel processing. The testing is totally transparent to the user, requires no external programming and has no effect on the operation of the module. This capability is accomplished by an additional test comparator that is incorporated into each module. The test comparator checks each channel and is compared against the operational channel. Depending upon the configuration, the Input data read, or Output logic written of the operational channel and test comparator must agree or a fault is indicated with the results available in the associated status register. The results of the tests are stored in the BIT Dynamic Status and BIT Latched Status registers.

The technique used by the continuous background BIT (CBIT) test consists of an “add-2, subtract-1” counting scheme. The BIT counter is incremented by 2 when a BIT-fault is detected and decremented by 1 when there is no BIT fault detected and the BIT counter is greater than 0. When the BIT counter exceeds the (programmed) Background BIT Threshold value, the specific channel’s fault bit in the BIT status register will be set. Note, the interval at which BIT is performed is dependent and differs between module types. Rather than specifying the BIT Threshold as a “count”, the BIT Threshold is specified as a time in milliseconds. The module will convert the time specified to the BIT Threshold “count” based on the BIT interval for that module. The “add-2, subtract-1” counting scheme effectively filters momentary or intermittent anomalies by allowing them to “come and go“ before a BIT fault status or indication is flagged (e.g., BIT faults would register when sustained; i.e. at a ten second interval, not a 10-millisecond interval). This prevents spurious faults from registering valid such as those caused by EMI and/or dirty power causing false BIT faults. Putting more “weight” on errors (“add-2”) and less “weight” on subsequent passing results (subtract-1) will result in a BIT failure indication even if a channel “oscillates” between a pass and fail state.

In addition to BIT, the Discrete module tests for overcurrent conditions and provides Above Max High Voltage, Below Min Low Voltage, and Mid-Range Voltage statuses for threshold signal transitioning.

Status and Interrupts

The Discrete I/O Function Module provide registers that indicate faults or events. Refer to “Status and Interrupts Module Manual” for the Principle of Operation description.

Module Common Registers

The Discrete I/O Function Module includes module common registers that provide access to module-level bare metal/FPGA revisions & compile times, unique serial number information, and temperature/voltage/current monitoring. Refer to “Module Common Registers Module Manual” for the detailed information.

Unit Conversions

The Discrete Module Threshold and Measurement registers can be programmed to be utilized as a single precision floating point value (IEEE-754) or as a 32-bit integer value. The purpose for providing this feature is to offload the processing that is normally performed by the mission processor to convert the integer values to floating-point values.

When the Enable Floating Point Mode register is set to 1 (Floating Point Mode) the following registers are formatted as Single Precision Floating Point Value (IEEE-754):

Voltage Reading (Volts)
Current Reading (mA)
VCC Voltage Reading (Volts)
Max High Voltage Threshold (Volts)
Upper Voltage Threshold (Volts)
Lower Voltage Threshold (Volts)
Min Low Voltage Threshold (Volts)
Pull-Up/Down Current (mA)

*When the Enable Floating Point Mode register is set to 1, it is important that these registers are updated with the Single Precision Floating Point (IEEE-754) representation of the value for proper operation of the channel. Conversely, when the Enable Floating Point Mode register is set to 0, these registers must be updated with the Integer 32-bit representation of the value.

Note

when changing the Enable Floating Point Mode from Integer Mode to Floating Point Mode or vice versa, the following steps are followed to avoid faults from falsely being generated:

Set the Enable Floating Point Mode register to the desired mode (Integer or Floating Point).
The application waits for the Floating Point State register to match the value for the requested Floating Point Mode (Integer = 0, Floating Point = 1); this indicates that the module’s conversion of the register values and internal values is complete. Data registers will be converted to the units specified and can be read in that specified format.

User Watchdog Timer Capability

The Discrete Modules provide registers that support User Watchdog Timer capability. Refer to “User Watchdog Timer Module Manual” for the Principle of Operation description.

REGISTER DESCRIPTIONS

The register descriptions provide the register name, Type, Data Range, Read or Write information, Initialized Value, a description of the function and, in most cases, a data table.

Discrete Input/Output Registers

Each channel can be configured as an input or one of three types of outputs. The I/O Format (Ch1-16 and Ch17-24) registers are used to set each channel input/output configuration. The Write Outputs register controls the output channels to either a High (1) or Low (0) state, and the Read I/O register contains the discrete channel’s state (High (1) or Low (0)) as specified by the channel’s threshold configurations.

I/O Format Ch1-16

Function: Sets channels 1-16 as inputs or outputs. See I/O Format Ch17-24 register for channels 17-24.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0xFFFF FFFF

Read/Write: R/W

Initialized Value: 0

Operational Settings: Write integer 0 for input; 1, 2 or 3 for specific output format.

Integer	D_H	D_L	(2 bits per channel)
0	0	0	Input
1	0	1	Output, Low-side switched, with/without current pull up
2	1	0	Output, High-side switched, with/without current pull down
3	1	1	Output, push-pull

I/O Format Ch1-16

D31

D30

D29

D28

D27

D26

D25

D24

D23

D22

D21

D20

D19

D18

D17

D16

Ch16

Ch15

Ch14

Ch13

Ch12

Ch11

Ch10

Ch9

D15

D14

D13

D12

D11

D10

Ch8

Ch7

Ch6

Ch5

Ch4

Ch3

Ch2

Ch1

I/O Format Ch17-24

Function: Sets channels 17-24 as inputs or outputs. See I/O Format Ch1-16 for channels 1-16.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x0000 FFFF

Read/Write: R/W

Initialized Value: 0

Operational Settings: Write integer 0 for input; 1, 2 or 3 for specific output format.

Integer	D_H	D_L	(2 bits per channel)
0	0	0	Input
1	0	1	Output, Low-side switched, with/without current pull up
2	1	0	Output, High-side switched, with/without current pull down
3	1	1	Output, push-pull

I/O Format Ch17-24

D31

D30

D29

D28

D27

D26

D25

D24

D23

D22

D21

D20

D19

D18

D17

D16

D15

D14

D13

D12

D11

D10

Ch24

Ch23

Ch22

Ch21

Ch20

Ch19

Ch18

Ch17

Write Outputs

Function: Drives output channels High 1 or Low 0

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: R/W

Initialized Value: 0

Operational Settings: Write 1 to drive output high. Write 0 to drive output low

Write Outputs

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
0	0	0	0	0	0	0	0	Ch24	Ch23	Ch22	Ch21	Ch20	Ch19	Ch18	Ch17
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
Ch16	Ch15	Ch14	Ch13	Ch12	Ch11	Ch10	Ch9	Ch8	Ch7	Ch6	Ch5	Ch4	Ch3	Ch2	Ch1

Input/Output State

Function: Reads High 1 or Low 0 inputs or outputs as defined by internal channel threshold values.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: R

Initialized Value: N/A

Operational Settings: Bit-mapped per channel.

Input/Output State

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
0	0	0	0	0	0	0	0	Ch24	Ch23	Ch22	Ch21	Ch20	Ch19	Ch18	Ch17
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
Ch16	Ch15	Ch14	Ch13	Ch12	Ch11	Ch10	Ch9	Ch8	Ch7	Ch6	Ch5	Ch4	Ch3	Ch2	Ch1

Discrete Input/Output Voltage Threshold Programming Registers

Four threshold levels: Max High Voltage Threshold, Upper Voltage Threshold, Lower Voltage Threshold, and Min Low Voltage Threshold are programmable for each Discrete channel in the module.

Voltage Threshold Levels (Integer Mode)

Max High Voltage Threshold (Enable Floating Point Mode: Integer Mode)

Upper Voltage Threshold (Enable Floating Point Mode: Integer Mode)

Lower Voltage Threshold (Enable Floating Point Mode: Integer Mode)

Min Low Voltage Threshold (Enable Floating Point Mode: Integer Mode)

D31

D30

D29

D28

D27

D26

D25

D24

D23

D22

D21

D20

D19

D18

D17

D16

D15

D14

D13

D12

D11

D10

Voltage Threshold Levels (Floating Point Mode)

Max High Voltage Threshold (Enable Floating Point Mode: Floating Point Mode)

Upper Voltage Threshold (Enable Floating Point Mode: Floating Point Mode)

Lower Voltage Threshold (Enable Floating Point Mode: Floating Point Mode)

Min Low Voltage Threshold (Enable Floating Point Mode: Floating Point Mode)

D31

D30

D29

D28

D27

D26

D25

D24

D23

D22

D21

D20

D19

D18

D17

D16

D15

D14

D13

D12

D11

D10

Max High Voltage Threshold

Function: Sets the maximum high voltage threshold value. Programmable per channel from 0 VDC to 60 VDC.

Type: unsigned binary word (32-bit) (Integer Mode) or Single Precision Floating Point Value (IEEE-754) (Floating Point Mode)

Data Range:

Enable Floating Point Mode: 0 (Integer Mode)

  0x0000 0000 to 0x0000 0258

Enable Floating Point Mode: 1 (Floating Point Mode)

 Single Precision Floating Point Value (IEEE-754)

Read/Write: R/W

Initialized Value: 0x32

Operational Settings: Assumes that the programmed level is the minimum voltage used to indicate a Max High Voltage Threshold. If a signal is greater than the Max High Voltage Threshold value, a flag is set in the Max High Voltage Threshold Status register. The Max High Voltage Threshold register may be used to monitor any type of high signal voltage condition or threshold such as a “Short to +V” as it applies to input measurement as well as contact sensing applications.

Integer Mode: LSB is 0.1 VDC. For example: to program 5.0 VDC, 5.0 / 0.1 = 50 (binary equivalent for 50 is 0x0000 0032).

Floating Point Mode: Set Max High Voltage Threshold value as a Single Precision Floating Point Value (IEEE-754). For example, to program 5.0 V, enter 5.0 as a single precision floating point value (IEEE-754) (binary equivalent 5.0 is 0x40A0 0000).

Upper Voltage Threshold

Function: Sets the upper voltage threshold value. Programmable per channel from 0 VDC to 60 VDC.

Type: unsigned binary word (32-bit) (Integer Mode) or Single Precision Floating Point Value (IEEE-754) (Floating Point Mode)

Data Range:

Enable Floating Point Mode: 0 (Integer Mode)

 0x0000 0000 to 0x0000 0258

Enable Floating Point Mode: 1 (Floating Point Mode)

 Single Precision Floating Point Value (IEEE-754)

Read/Write: R/W

Initialized Value: 0x28

Operational Settings: A signal is considered logic High 1 when its value exceeds the Upper Voltage Threshold and does not consequently fall below the Upper Voltage Threshold in less than the programmed Debounce Time.

Integer Mode: LSB is 0.1 VDC. For example: to program 3.5 VDC, 3.5 / 0.1 = 35 (binary equivalent for 35 is 0x0000 0023).

Floating Point Mode: Set Upper Voltage Threshold value as a Single Precision Floating Point Value (IEEE-754). For example, to program 3.5 V, enter 3.5 as a single precision floating point value (IEEE-754) (binary equivalent 3.5 is 0x4060 0000).

Lower Voltage Threshold

Function:: Sets the lower voltage threshold value. Programmable per channel from 0 VDC to 60 VDC.

Type: unsigned binary word (32-bit) (Integer Mode) or Single Precision Floating Point Value (IEEE-754) (Floating Point Mode)

Data Range:

Enable Floating Point Mode: 0 (Integer Mode)

 0x0000 0000 to 0x0000 0258

Enable Floating Point Mode: 1 (Floating Point Mode)

 Single Precision Floating Point Value (IEEE-754)

Read/Write: R/W

Initialized Value: 0x10

Operational Settings: A signal is considered logic Low 0 when its value falls below the Lower Voltage Threshold and does not consequently rise above the Lower Voltage Threshold in less than the programmed Debounce Time.

Integer Mode: LSB is 0.1 VDC. For example: to program 1.5 VDC, 1.5 / 0.1 = 15 (binary equivalent for 15 is 0x0000 000F).

Floating Point Mode: Set Lower Voltage Threshold value as a Single Precision Floating Point Value (IEEE-754). For example, to program 1.5 V, enter 1.5 as a single precision floating point value (IEEE-754) (binary equivalent 1.5 is 0x3FC0 0000).

Min Low Voltage Threshold

Function:: Sets the minimum low voltage threshold. Programmable per channel 0 VDC to 60 VDC.

Type: unsigned binary word (32-bit) (Integer Mode) or Single Precision Floating Point Value (IEEE-754) (Floating Point Mode)

Data Range:

Enable Floating Point Mode: 0 (Integer Mode)

 0x0000 0000 to 0x0000 0258

Enable Floating Point Mode: 1 (Floating Point Mode)

 Single Precision Floating Point Value (IEEE-754)

Read/Write: R/W

Initialized Value: 0xA

Operational Settings: Assumes that the programmed level is the voltage used to indicate a Minimum Low Voltage Threshold. If a signal is less than the Min Low Voltage Threshold value, a flag is set in the Min Low Voltage Threshold Status register. The Min Low Voltage Threshold register may be used to monitor any type of low signal voltage condition or threshold such as a “Short to Ground” as it applies to input measurement as well as contact sensing applications.

Integer Mode: LSB is 0.1 VDC. For example: to program 0.5 VDC, 0.5 / 0.1 = 5 (binary equivalent for 5 is 0x0000 0005).

Floating Point Mode: Set Min Low Voltage Threshold value as a Single Precision Floating Point Value (IEEE-754). For example, to program 0.5 V, enter 0.5 as a single precision floating point value (IEEE-754) (binary equivalent 0.5 is 0x3F00 0000).

Discrete Input/Output Measurement Registers

The measured voltage and current at the I/O pin for each channel can be read from the Voltage Reading and Current Reading registers.

Voltage Reading

Function:: Reads actual voltage at I/O pin per individual channel.

Type: unsigned binary word (32-bit) (Integer Mode) or Single Precision Floating Point Value (IEEE-754) (Floating Point Mode)

Data Range:

Enable Floating Point Mode: 0 (Integer Mode)

 0x0000 0000 to 0x0000 0258

Enable Floating Point Mode: 1 (Floating Point Mode)

 Single Precision Floating Point Value (IEEE-754)

Read/Write: R

Initialized Value: N/A

Operational Settings:

Integer Mode: LSB is 0.1 VDC. If the register value is 261 (binary equivalent for 261 is 0x0000 0105), conversion to the voltage value is 261 * 0.1 = 26.1 V.

Floating Point Mode: Read as a Single Precision Floating Point Value (IEEE-754). For example, if the register value is 0x41D0 CCCD, this is equivalent to is 26.1, which represent 26.1 V.

Voltage Reading (Enable Floating Point Mode: Integer Mode)

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
0	0	0	D	D	D	D	D	D	D	D	D	D	D	D	D

Voltage Reading (Enable Floating Point Mode: Floating Point Mode)

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
D	D	D	D	D	D	D	D	D	D	D	D	D	D	D	D
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
D	D	D	D	D	D	D	D	D	D	D	D	D	D	D	D

Current Reading

Function:: Reads actual output current through I/O pin per channel.

Type: signed binary word (32-bit (only lower 16-bit is used)) (Integer Mode) or Single Precision Floating Point Value (IEEE-754) (Floating Point Mode)

Data Range:

Enable Floating Point Mode: 0 (Integer Mode)

 (2's compliment. 16-bit value sign extended to 32 bits)

 0x0000 0000 to 0x0000 00D0 (positive) or 0x0000 FF30 (negative)

Enable Floating Point Mode: 1 (Floating Point Mode)

 Single Precision Floating Point Value (IEEE-754)

Read/Write: R

Initialized Value: N/A

Operational Settings:

Integer Mode: LSB is 3.0 mA. Value is signed binary 16-bit word. Read as 2’s complement value for positive and negative current readings. For example, if the register value is 50 (binary equivalent for 50 is 0x0000 0032), the conversion to the current value is 50 * 3.0 = 150 mA. If register value is -50 (binary equivalent for -150 is 0x0000 FFCE), the conversion to the current value is -50

3.0 = -150 mA.

Floating Point Mode: Read as a Single Precision Floating Point Value (IEEE-754). The value will represent a positive or negative current reading. For example, if the register value is 0x4316 0000, this is equivalent to 150, which represent 150 mA. If the register value is 0xC316 0000, this is equivalent to -150, which represents -150 mA.

Current Reading (Enable Floating Point Mode: Integer Mode)

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
D	D	D	D	D	D	D	D	D	D	D	D	D	D	D	D

Current Reading (Enable Floating Point Mode: Floating Point Mode)

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
D	D	D	D	D	D	D	D	D	D	D	D	D	D	D	D
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
D	D	D	D	D	D	D	D	D	D	D	D	D	D	D	D

VCC Bank Registers

There are four VCC banks where each bank controls 6 discrete channels. Configuration for each bank involves specifying if the bank is configured for pull-up or pull-down and the current for source/sink. The measured voltage for each VCC bank can be read from the VCC Voltage Reading register.

Select Pull-Up or Pull-Down

Function:: Configures Pull-up or Pull-down configuration per 6-channel bank

Type: unsigned binary word (32-bit)

Data Range: 0 to 0x0000 000F

Read/Write: R/W

Initialized Value: 0

Operational Settings: Set bit to 1 to configure channel bank to Pull-up. Set bit to 0 to configure channel bank to Pull-down. Each data bit configures entire bank of 6 channels.

Note

For contact (switch closure) applications, a current supply (Vcc) is required for internal pull-up.

Select Pull-Up or Pull-Down

Bit(s)	Name	Description
D31:D4	Reserved	Set Reserved bits to 0.
D3	Configure Bank 4 (Ch 19-24)	1=Pull-Up, 0=Pull-Down
D2	Configure Bank 3 (Ch 13-18)	1=Pull-Up, 0=Pull-Down
D1	Configure Bank 2 (Ch 07-12)	1=Pull-Up, 0=Pull-Down
D0	Configure Bank 1 (Ch 01-06)	1=Pull-Up, 0=Pull-Down

Pull-Up/Down Current

Function:: Sets current for pull-up/down per 6-channel bank. Programmable from 0 to 5 mA.

Type: unsigned binary word (32-bit) (Integer Mode) or Single Precision Floating Point Value (IEEE-754) (Floating Point Mode)

Data Range:

Enable Floating Point Mode: 0 (Integer Mode)

 0x0000 0000 to 0x0000 0032

Enable Floating Point Mode: 1 (Floating Point Mode)

 Floating Point Value (IEEE-754)

Read/Write: R/W

Initialized Value: 0

Operational Settings: A current of zero disables the current pull-down circuits and configures for voltage sensing.

Integer Mode: LSB is 0.1 mA. For example: to program 5 mA, 5 / 0.1 = 50 (binary equivalent for 50 is 0x0000 0032).

Floating Point Mode: Set the current for pull-up/down as a Single Precision Floating Point Value (IEEE-754). For example, to program 5 mA, enter 5.0 as a Single Precision Floating Point Value (IEEE-754) (binary equivalent for 5.0 is 0x40A0 0000).

Pull-Up/Down Current (Enable Floating Point Mode: Integer Mode)

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
0	0	0	0	0	0	0	0	0	0	D	D	D	D	D	D

Pull-Up/Down Current (Enable Floating Point Mode: Floating Point Mode)

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
D	D	D	D	D	D	D	D	D	D	D	D	D	D	D	D
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
D	D	D	D	D	D	D	D	D	D	D	D	D	D	D	D

VCC Voltage Reading

Function:: Read the VCC bank voltage.

Type: unsigned binary word (32-bit) (Integer Mode) or Single Precision Floating Point Value (IEEE-754) (Floating Point Mode)

Data Range:

Enable Floating Point Mode: 0 (Integer Mode)

 0x0000 0000 to 0x0000 0258

Enable Floating Point Mode: 1 (Floating Point Mode)

 Single Precision Floating Point Value (IEEE-754)

Read/Write: R

Initialized Value: N/A

Operational Settings:

Integer Mode: LSB is 0.1 VDC. If the register value is 260 (binary equivalent for this value is 0x0000 0104), conversion to the voltage value is 260 * 0.1 = 26.0 V.

Floating Point Mode: Read as a Single Precision Floating Point Value (IEEE-754). For example, the binary equivalent for 0x41D0 0000 is 26.0 which represent 26.0 V.

VCC Voltage Reading (Enable Floating Point Mode: Integer Mode)

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
0	0	0	D	D	D	D	D	D	D	D	D	D	D	D	D

VCC Voltage Reading (Enable Floating Point Mode: Floating Point Mode)

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
D	D	D	D	D	D	D	D	D	D	D	D	D	D	D	D
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
D	D	D	D	D	D	D	D	D	D	D	D	D	D	D	D

Discrete Input/Output Control Registers

Control of the Discrete I/O channels include specifying the Debounce time for each input channel and resetting the I/O channel on an overcurrent condition.

Debounce Time

Function: When set for inputs, the input signal will have the debounce filtering applied based on this programmed value. This is selectable for each channel.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0xFFFF FFFF

Read/Write: R/W

Initialized Value: 0

Operational Settings: The Debounce Time register, when programmed for a non-zero value, is used with channels programmed as input to “filter” or “ignore” expected application spurious initial transitions. Enter required Debounce Time into appropriate channel registers. LSB weight is 10 µs/bit (register may be programmed from 0x0000 0000 (debounce filter inactive) through a maximum of 0xFFFF FFFF (2^32 * 10µs). (full scale w/ 10 µs resolution). Once a signal level is a logic voltage level period longer than the debounce time (Logic High and Logic Low), a logic transition is validated. Signal pulse widths less than programmed Debounce Time are filtered. Once valid, the transition status register flag is set for the channel and the output logic changes state. Enter a value of 0 to disable debounce filtering.

Overcurrent Reset

Function:: Resets disabled channels in Overcurrent Latched Status register following an overcurrent condition as measured by the Current Reading register.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: R/W

Initialized Value: 0

Operational Settings: 1 is written to reset disabled channels. Processor will write a 0 back to the Overcurrent Reset register when reset process is complete.

Overcurrent Reset

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
0	0	0	0	0	0	0	0	Ch24	Ch23	Ch22	Ch21	Ch20	Ch19	Ch18	Ch17
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
Ch16	Ch15	Ch14	Ch13	Ch12	Ch11	Ch10	Ch9	Ch8	Ch7	Ch6	Ch5	Ch4	Ch3	Ch2	Ch1

Unit Conversion Programming Registers

The Enable Floating Point register provides the ability to set the Threshold values as floating-point values and read the Voltage Reading and Current Reading registers as floating-point values. The purpose for this feature is to offload the processing that is normally performed by the mission processor to convert the integer values to floating-point values.

Enable Floating Point Mode

Function:: Sets all channels for floating point mode or integer module.

Type: unsigned binary word (32-bit)

Data Range: 0 to 1

Read/Write: R/W

Initialized Value: 0

Operational Settings: Set bit to 1 to enable Floating Point Mode and 0 for Integer Mode. Wait for the Floating Point State register to match the value for the requested Floating Point Mode (Integer = 0, Floating Point = 1); this indicates that the module’s conversion of the register values and internal values is complete before changing the values of the configuration and control registers with the values in the units specified (Integer or Floating Point).

Enable Floating Point Mode

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

Floating Point State

Function:: Indicates the state of the mode selected (Integer or Floating Point).

Type: unsigned binary word (32-bit)

Data Range: 0 to 1

Read/Write: R

Initialized Value: 0

Operational Settings: Indicates the whether the module registers are in Integer (0) or Floating Point Mode (1). When the Enable Floating Point Mode is modified, the application must wait until this register’s value matches the requested mode before changing the values of the configuration and control registers with the values in the units specified (Integer or Floating Point).

Floating Point State

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	D

Background BIT Threshold Programming Registers

The Background BIT Threshold register provides the ability to specify the minimum time before the BIT fault is reported in the BIT Status registers. The BIT Count Clear register provides the ability to reset the BIT counter used in CBIT.

Background BIT Threshold

Function:: Sets BIT Threshold value (in milliseconds) to use for all channels for BIT failure indication.

Type: unsigned binary word (32-bit)

Data Range: 1 ms to 2^32 ms

Read/Write: R/W

Initialized Value: 5 ms

Operational Settings: The interval at which BIT is performed is dependent and differs between module types. Rather than specifying the BIT Threshold as a “count”, the BIT Threshold is specified as a time in milliseconds. The module will convert the time specified to the BIT Threshold “count” based on the BIT interval for that module.

BIT Count Clear

Function:: Resets the CBIT internal circuitry and count mechanism. Set the bit corresponding to the channel you want to clear.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: W

Initialized Value: 0

Operational Settings: Set bit to 1 for channel to resets the CBIT mechanisms. Bit is self-clearing.

BIT Count Clear

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
0	0	0	0	0	0	0	0	Ch24	Ch23	Ch22	Ch21	Ch20	Ch19	Ch18	Ch17
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
Ch16	Ch15	Ch14	Ch13	Ch12	Ch11	Ch10	Ch9	Ch8	Ch7	Ch6	Ch5	Ch4	Ch3	Ch2	Ch1

User Watchdog Timer Programming Registers

Refer to “User Watchdog Timer Module Manual” for the register descriptions.

Module Common Registers

Refer to “Module Common Registers Module Manual” for the register descriptions

Status and Interrupt Registers

The Discrete Module provides status registers for BIT, Low-to-High Transition, High-to-Low Transition, Overcurrent, Above Max High Voltage, Below Min Low Voltage, and Mid-Range Voltage.

Channel Status Enable

Function:: Determines whether to update the status for the channels. This feature can be used to “mask” status bits of unused channels in status registers that are bitmapped by channel.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF (Channel Status)

Read/Write: R/W

Initialized Value: 0x00FF FFFF

Operational Settings: When the bit corresponding to a given channel in the Channel Status Enable register is not enabled (0) the status will be masked and report “0” or “no failure”. This applies to all statuses that are bitmapped by channel (BIT Status, Low-to-High Transition Status, High-to-Low Transition Status, Overcurrent Status, Above Max High Voltage Status, Below Min Low Voltage Status, Mid-Range Voltage and Summary Status).

Note

Background BIT will continue to run even if the Channel Status Enable is set to 0’.

Channel Status Enable

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
0	0	0	0	0	0	0	0	Ch24	Ch23	Ch22	Ch21	Ch20	Ch19	Ch18	Ch17
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
Ch16	Ch15	Ch14	Ch13	Ch12	Ch11	Ch10	Ch9	Ch8	Ch7	Ch6	Ch5	Ch4	Ch3	Ch2	Ch1

BIT Status

There are four registers associated with the BIT Status: Dynamic, Latched, Interrupt Enable, and Set Edge/Level Interrupt.

Note

When a BIT fault is detected, reading the Voltage Reading Error and the Driver Error register will provide additional diagnostics on the cause of the BIT fault.

BIT Status

BIT Dynamic Status

BIT Latched Status

BIT Interrupt Enable

BIT Set Edge/Level Interrupt

D31

D30

D29

D28

D27

D26

D25

D24

D23

D22

D21

D20

D19

D18

D17

D16

Ch24

Ch23

Ch22

Ch21

Ch20

Ch19

Ch18

Ch17

D15

D14

D13

D12

D11

D10

Ch16

Ch15

Ch14

Ch13

Ch12

Ch11

Ch10

Ch9

Ch8

Ch7

Ch6

Ch5

Ch4

Ch3

Ch2

Ch1

Function:: Sets the corresponding bit associated with the channel’s BIT error.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: R (Dynamic), R/W (Latched, Interrupt Enable, Edge/Level Interrupt)

Initialized Value: 0

Note

Faults are detected (associated channel(s) bit set to 1) within 10 ms.

Voltage Reading Error

Function: The Voltage Reading Error register is set when a redundant voltage measurement is inconsistent with the input voltage level detected.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: R

Initialized Value: 0

Operational Settings: 1 is read when a fault is detected. 0 indicates no fault detected.

Note

Faults are detected (associated channel(s) bit set to 1) within 10 ms.

Note

Clearing the latched BIT status will also clear this error register.

Voltage Reading Error

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
0	0	0	0	0	0	0	0	Ch24	Ch23	Ch22	Ch21	Ch20	Ch19	Ch18	Ch17
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
Ch16	Ch15	Ch14	Ch13	Ch12	Ch11	Ch10	Ch9	Ch8	Ch7	Ch6	Ch5	Ch4	Ch3	Ch2	Ch1

Driver Error

Function:: The Driver Error register is set when the voltage reading mismatches active driver measurement and is inconsistent with the input driver level detected.

Note

Requires programming of thresholds.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: R

Initialized Value: 0

Operational Settings: 1 is read when a fault is detected. 0 indicates no fault detected.

Note

Faults are detected (associated channel(s) bit set to 1) within 10 ms.

Note

Clearing the latched BIT status will also clear this error register.

Driver Error

D31	D30	D29	D28	D27	D26	D25	D24	D23	D22	D21	D20	D19	D18	D17	D16
0	0	0	0	0	0	0	0	Ch24	Ch23	Ch22	Ch21	Ch20	Ch19	Ch18	Ch17
D15	D14	D13	D12	D11	D10	D9	D8	D7	D6	D5	D4	D3	D2	D1	D0
Ch16	Ch15	Ch14	Ch13	Ch12	Ch11	Ch10	Ch9	Ch8	Ch7	Ch6	Ch5	Ch4	Ch3	Ch2	Ch1

Low-to-High Transition Status

There are four registers associated with the High-to-Low Transition Status: Dynamic, Latched, Interrupt Enable, and Set Edge/Level Interrupt.

Low-to-High Transition Status

Low-to-High Dynamic Status

Low-to-High Latched Status

Low-to-High Interrupt Enable

Low-to-High Set Edge/Level Interrupt

D31

D30

D29

D28

D27

D26

D25

D24

D23

D22

D21

D20

D19

D18

D17

D16

Ch24

Ch23

Ch22

Ch21

Ch20

Ch19

Ch18

Ch17

D15

D14

D13

D12

D11

D10

Ch16

Ch15

Ch14

Ch13

Ch12

Ch11

Ch10

Ch9

Ch8

Ch7

Ch6

Ch5

Ch4

Ch3

Ch2

Ch1

Function:: Sets the corresponding bit associated with the channel’s Low-to-High Transition event.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: R (Dynamic), R/W (Latched, Interrupt Enable, Edge/Level Interrupt)

Initialized Value: 0

Note

Considered “momentary” during the actual event when detected. Programmable for level or edge sensing, status is indicated (associated channel(s) bit set to 1) within 20 µs.

Note

Programmable for level or edge sensing, status is indicated (associated channel(s) bit set to 1) within 20 µs.

Note

Transition status follows the value read by the Input/Output State register.

High-to-Low Transition Status

There are four registers associated with the High-to-Low Transition Status: Dynamic, Latched, Interrupt Enable, and Set Edge/Level Interrupt.

High-to-Low Transition Status

High-to-Low Dynamic Status

High-to-Low Latched Status

High-to-Low Interrupt Enable

High-to-Low Set Edge/Level Interrupt

D31

D30

D29

D28

D27

D26

D25

D24

D23

D22

D21

D20

D19

D18

D17

D16

Ch24

Ch23

Ch22

Ch21

Ch20

Ch19

Ch18

Ch17

D15

D14

D13

D12

D11

D10

Ch16

Ch15

Ch14

Ch13

Ch12

Ch11

Ch10

Ch9

Ch8

Ch7

Ch6

Ch5

Ch4

Ch3

Ch2

Ch1

Function:: Sets the corresponding bit associated with the channel’s High-to-Low Transition event.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: R (Dynamic), R/W (Latched, Interrupt Enable, Edge/Level Interrupt)

Initialized Value: 0

Note

Considered “momentary” during the actual event when detected. Programmable for level or edge sensing, status is indicated (associated channel(s) bit set to 1) within 20 µs.

Note

Programmable for level or edge sensing, status is indicated (associated channel(s) bit set to 1) within 20 µs.

Note

Transition status follows the value read by the Input/Output State register.

Overcurrent Status

There are four registers associated with the Overcurrent Status: Dynamic, Latched, Interrupt Enable, and Set Edge/Level Interrupt.

Overcurrent Status

Overcurrent Dynamic Status

Overcurrent Latched Status

Overcurrent Interrupt Enable

Overcurrent Set Edge/Level Interrupt

D31

D30

D29

D28

D27

D26

D25

D24

D23

D22

D21

D20

D19

D18

D17

D16

Ch24

Ch23

Ch22

Ch21

Ch20

Ch19

Ch18

Ch17

D15

D14

D13

D12

D11

D10

Ch16

Ch15

Ch14

Ch13

Ch12

Ch11

Ch10

Ch9

Ch8

Ch7

Ch6

Ch5

Ch4

Ch3

Ch2

Ch1

Function:: Sets the corresponding bit associated with the channel’s Overcurrent error.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: R (Dynamic), R/W (Latched, Interrupt Enable, Edge/Level Interrupt)

Initialized Value: 0

Note

Status is indicated (associated channel(s) bit set to 1), within 80 ms.

Note

Latched Status is indicated (associated channel(s) bit set to 1), within 80 ms.

Note

Channel(s) shut down by overcurrent sensed can be reset by writing to the Overcurrent Clear register.

Above Max High Voltage Status

There are four registers associated with the Above Max High Voltage Status: Dynamic, Latched, Interrupt Enable, and Set Edge/Level Interrupt. Latched status is indicated (bit is set) within 500 µs. Write a 1 to clear status.

Above Max High Voltage Status

Above Max High Voltage Dynamic Status

Above Max High Voltage Latched Status

Above Max High Voltage Interrupt Enable

Above Max High Voltage Set Edge/Level Interrupt

D31

D30

D29

D28

D27

D26

D25

D24

D23

D22

D21

D20

D19

D18

D17

D16

Ch24

Ch23

Ch22

Ch21

Ch20

Ch19

Ch18

Ch17

D15

D14

D13

D12

D11

D10

Ch16

Ch15

Ch14

Ch13

Ch12

Ch11

Ch10

Ch9

Ch8

Ch7

Ch6

Ch5

Ch4

Ch3

Ch2

Ch1

Function:: Sets the corresponding bit associated with the channel’s Above Max High Voltage event.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: R (Dynamic), R/W (Latched, Interrupt Enable, Edge/Level Interrupt)

Initialized Value: 0

Below Min Low Voltage Status

There are four registers associated with the Below Min Low Voltage Status: Dynamic, Latched, Interrupt Enable, and Set Edge/Level Interrupt. Latched status is indicated (bit is set) within 500 µs. Write a 1 to clear status.

Below Min Low Voltage Status

Below Min Low Voltage Dynamic Status

Below Min Low Voltage Latched Status

Below Min Low Voltage Interrupt Enable

Below Min Low Voltage Set Edge/Level Interrupt

D31

D30

D29

D28

D27

D26

D25

D24

D23

D22

D21

D20

D19

D18

D17

D16

Ch24

Ch23

Ch22

Ch21

Ch20

Ch19

Ch18

Ch17

D15

D14

D13

D12

D11

D10

Ch16

Ch15

Ch14

Ch13

Ch12

Ch11

Ch10

Ch9

Ch8

Ch7

Ch6

Ch5

Ch4

Ch3

Ch2

Ch1

Function:: Sets the corresponding bit associated with the channel’s Below Min Low Voltage event.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: R (Dynamic), R/W (Latched, Interrupt Enable, Edge/Level Interrupt)

Initialized Value: 0

Mid-Range Voltage Status

There are four registers associated with the Mid-Range Voltage Status: Dynamic, Latched, Interrupt Enable, and Set Edge/Level Interrupt. Latched status is indicated (bit is set) within 500 µs. Write a 1 to clear status.

Mid-Range Voltage Status

Mid-Range Voltage Dynamic Status

Mid-Range Voltage Latched Status

Mid-Range Voltage Interrupt Enable

Mid-Range Voltage Set Edge/Level Interrupt

D31

D30

D29

D28

D27

D26

D25

D24

D23

D22

D21

D20

D19

D18

D17

D16

Ch24

Ch23

Ch22

Ch21

Ch20

Ch19

Ch18

Ch17

D15

D14

D13

D12

D11

D10

Ch16

Ch15

Ch14

Ch13

Ch12

Ch11

Ch10

Ch9

Ch8

Ch7

Ch6

Ch5

Ch4

Ch3

Ch2

Ch1

Function:: Sets the corresponding bit associated with the channel’s Mid-Range Voltage event.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: R (Dynamic), R/W (Latched, Interrupt Enable, Edge/Level Interrupt)

Initialized Value: 0

Note

Voltage level needs to be between the upper and lower thresholds for the debounce time for this status to assert.

Note

In the event this status is asserted, the Input/Output state will hold its previous state.

User Watchdog Timer Fault Status

The Discrete Modules provide registers that support User Watchdog Timer capability. Refer to “User Watchdog Timer Module Manual” for the User Watchdog Timer Fault Status Register descriptions.

Summary Status

There are four registers associated with the Summary Status: Dynamic, Latched, Interrupt Enable, and Set Edge/Level Interrupt.

Summary Status

Summary Status Dynamic Status

Summary Status Latched Status

Summary Status Interrupt Enable

Summary Status Set Edge/Level Interrupt

D31

D30

D29

D28

D27

D26

D25

D24

D23

D22

D21

D20

D19

D18

D17

D16

Ch24

Ch23

Ch22

Ch21

Ch20

Ch19

Ch18

Ch17

D15

D14

D13

D12

D11

D10

Ch16

Ch15

Ch14

Ch13

Ch12

Ch11

Ch10

Ch9

Ch8

Ch7

Ch6

Ch5

Ch4

Ch3

Ch2

Ch1

Function:: Sets the corresponding bit if any fault (BIT and Overcurrent) occurs on that channel.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0x00FF FFFF

Read/Write: R (Dynamic), R/W (Latched, Interrupt Enable, Edge/Level Interrupt)

Initialized Value: 0

Interrupt Vector and Status

When interrupts are enabled, the interrupt vector associated with the specific interrupt can be programmed (typically with a unique number/identifier) such that it can be utilized in the Interrupt Service Routine (ISR) to identify the type of interrupt. When an interrupt occurs, the contents of the Interrupt Vector registers is reported as part of the interrupt mechanism.

In addition to specifying the interrupt vector, the interrupt can be directed (“steered”) to the native bus or to the application running on the onboard ARM processor.

Note

The Interrupt Vector and Interrupt Steering registers are mapped to the Motherboard Common Memory and these registers are associated with the Module Slot position (refer to Function Register Map).

Interrupt Vector

Function:: Set an identifier for the interrupt.

Type: unsigned binary word (32-bit)

Data Range: 0x0000 0000 to 0xFFFF FFFF

Read/Write: R/W

Initialized Value: 0

Operational Settings: When an interrupt occurs, this value is reported as part of the interrupt mechanism.

Interrupt Steering

Function:: Sets where to direct the interrupt.

Type: unsigned binary word (32-bit)

Data Range: See table

Read/Write: R/W

Initialized Value: 0

Operational Settings: When an interrupt occurs, the interrupt is sent as specified:

Direct Interrupt to VME	1
Direct Interrupt to ARM Processor (via SerDes) (Custom App on ARM or NAI Ethernet Listener App)	2
Direct Interrupt to PCIe Bus	5
Direct Interrupt to cPCI Bus	6

FUNCTION REGISTER MAP

Key:

Bold Italic = Configuration/Control

Bold Underline = State/Measurement/Status

*When an event is detected, the bit associated with the event is set in this register and will remain set until the user clears the event bit. Clearing the bit requires writing a 1 back to the specific bit that was set when read (i.e., write-1-to-clear, writing a “1” to a bit set to “1” will set the bit to “0).

**Data is represented in Floating Point if Enable Floating Point Mode register is set to Floating Point Mode (1).

Discrete Input/Output Registers

0x1038	*I/O Format (Ch1-16)*	R/W
0x103C	*I/O Format (Ch17-24)*	R/W

0x1000	I/O State	R
0x1024	*Write Outputs*	R/W

0x20C0	Max High Voltage Threshold Ch 1****	R/W
0x2140	Max High Voltage Threshold Ch 2****	R/W
0x21C0	Max High Voltage Threshold Ch 3****	R/W
0x2240	Max High Voltage Threshold Ch 4****	R/W
0x22C0	Max High Voltage Threshold Ch 5****	R/W
0x2340	Max High Voltage Threshold Ch 6****	R/W
0x23C0	Max High Voltage Threshold Ch 7****	R/W
0x2440	Max High Voltage Threshold Ch 8****	R/W
0x24C0	Max High Voltage Threshold Ch 9****	R/W
0x2540	Max High Voltage Threshold Ch 10****	R/W
0x25C0	Max High Voltage Threshold Ch 11****	R/W
0x2640	Max High Voltage Threshold Ch 12****	R/W
0x26C0	Max High Voltage Threshold Ch 13****	R/W
0x2740	Max High Voltage Threshold Ch 14****	R/W
0x27C0	Max High Voltage Threshold Ch 15****	R/W
0x2840	Max High Voltage Threshold Ch 16****	R/W
0x28C0	Max High Voltage Threshold Ch 17****	R/W
0x2940	Max High Voltage Threshold Ch 18****	R/W
0x29C0	Max High Voltage Threshold Ch 19****	R/W
0x2A40	Max High Voltage Threshold Ch 20****	R/W
0x2AC0	Max High Voltage Threshold Ch 21****	R/W
0x2B40	Max High Voltage Threshold Ch 22****	R/W
0x2BC0	Max High Voltage Threshold Ch 23****	R/W
0x2C40	Max High Voltage Threshold Ch 24****	R/W

0x20C4	Upper Voltage Threshold Ch 1****	R/W
0x2144	Upper Voltage Threshold Ch 2****	R/W
0x21C4	Upper Voltage Threshold Ch 3****	R/W
0x2244	Upper Voltage Threshold Ch 4****	R/W
0x22C4	Upper Voltage Threshold Ch 5****	R/W
0x2344	Upper Voltage Threshold Ch 6****	R/W
0x23C4	Upper Voltage Threshold Ch 7****	R/W
0x2444	Upper Voltage Threshold Ch 8****	R/W
0x24C4	Upper Voltage Threshold Ch 9****	R/W
0x2544	Upper Voltage Threshold Ch 10****	R/W
0x25C4	Upper Voltage Threshold Ch 11****	R/W
0x2644	Upper Voltage Threshold Ch 12****	R/W
0x26C4	Upper Voltage Threshold Ch 13****	R/W
0x2744	Upper Voltage Threshold Ch 14****	R/W
0x27C4	Upper Voltage Threshold Ch 15****	R/W
0x2844	Upper Voltage Threshold Ch 16****	R/W
0x28C4	Upper Voltage Threshold Ch 17****	R/W
0x2944	Upper Voltage Threshold Ch 18****	R/W
0x29C4	Upper Voltage Threshold Ch 19****	R/W
0x2A44	Upper Voltage Threshold Ch 20****	R/W
0x2AC4	Upper Voltage Threshold Ch 21****	R/W
0x2B44	Upper Voltage Threshold Ch 22****	R/W
0x2BC4	Upper Voltage Threshold Ch 23****	R/W
0x2C44	Upper Voltage Threshold Ch 24****	R/W

0x20C8	Lower Voltage Threshold Ch 1****	R/W
0x2148	Lower Voltage Threshold Ch 2****	R/W
0x21C8	Lower Voltage Threshold Ch 3****	R/W
0x2248	Lower Voltage Threshold Ch 4****	R/W
0x22C8	Lower Voltage Threshold Ch 5****	R/W
0x2348	Lower Voltage Threshold Ch 6****	R/W
0x23C8	Lower Voltage Threshold Ch 7****	R/W
0x2448	Lower Voltage Threshold Ch 8****	R/W
0x24C8	Lower Voltage Threshold Ch 9****	R/W
0x2548	Lower Voltage Threshold Ch 10****	R/W
0x25C8	Lower Voltage Threshold Ch 11****	R/W
0x2648	Lower Voltage Threshold Ch 12****	R/W
0x26C8	Lower Voltage Threshold Ch 13****	R/W
0x2748	Lower Voltage Threshold Ch 14****	R/W
0x27C8	Lower Voltage Threshold Ch 15****	R/W
0x2848	Lower Voltage Threshold Ch 16****	R/W
0x28C8	Lower Voltage Threshold Ch 17****	R/W
0x2948	Lower Voltage Threshold Ch 18****	R/W
0x29C8	Lower Voltage Threshold Ch 19****	R/W
0x2A48	Lower Voltage Threshold Ch 20****	R/W
0x2AC8	Lower Voltage Threshold Ch 21****	R/W
0x2B48	Lower Voltage Threshold Ch 22****	R/W
0x2BC8	Lower Voltage Threshold Ch 23****	R/W
0x2C48	Lower Voltage Threshold Ch 24****	R/W

0x20CC	Min Low Voltage Threshold Ch 1****	R/W
0x214C	Min Low Voltage Threshold Ch 2****	R/W
0x21CC	Min Low Voltage Threshold Ch 3****	R/W
0x224C	Min Low Voltage Threshold Ch 4****	R/W
0x22CC	Min Low Voltage Threshold Ch 5****	R/W
0x234C	Min Low Voltage Threshold Ch 6****	R/W
0x23CC	Min Low Voltage Threshold Ch 7****	R/W
0x244C	Min Low Voltage Threshold Ch 8****	R/W
0x24CC	Min Low Voltage Threshold Ch 9****	R/W
0x254C	Min Low Voltage Threshold Ch 10****	R/W
0x25CC	Min Low Voltage Threshold Ch 11****	R/W
0x264C	Min Low Voltage Threshold Ch 12****	R/W
0x26CC	Min Low Voltage Threshold Ch 13****	R/W
0x274C	Min Low Voltage Threshold Ch 14****	R/W
0x27CC	Min Low Voltage Threshold Ch 15****	R/W
0x284C	Min Low Voltage Threshold Ch 16****	R/W
0x28CC	Min Low Voltage Threshold Ch 17****	R/W
0x294C	Min Low Voltage Threshold Ch 18****	R/W
0x29CC	Min Low Voltage Threshold Ch 19****	R/W
0x2A4C	Min Low Voltage Threshold Ch 20****	R/W
0x2ACC	Min Low Voltage Threshold Ch 21****	R/W
0x2B4C	Min Low Voltage Threshold Ch 22****	R/W
0x2BCC	Min Low Voltage Threshold Ch 23****	R/W
0x2C4C	Min Low Voltage Threshold Ch 24****	R/W

Discrete Input/Output Measurement Registers

0x20E0	Voltage Reading Ch 1****	R
0x2160	Voltage Reading Ch 2****	R
0x21E0	Voltage Reading Ch 3****	R
0x2260	Voltage Reading Ch 4****	R
0x22E0	Voltage Reading Ch 5****	R
0x2360	Voltage Reading Ch 6****	R
0x23E0	Voltage Reading Ch 7****	R
0x2460	Voltage Reading Ch 8****	R
0x24E0	Voltage Reading Ch 9****	R
0x2560	Voltage Reading Ch 10****	R
0x25E0	Voltage Reading Ch 11****	R
0x2660	Voltage Reading Ch 12****	R
0x26E0	Voltage Reading Ch 13****	R
0x2760	Voltage Reading Ch 14****	R
0x27E0	Voltage Reading Ch 15****	R
0x2860	Voltage Reading Ch 16****	R
0x28E0	Voltage Reading Ch 17****	R
0x2960	Voltage Reading Ch 18****	R
0x29E0	Voltage Reading Ch 19****	R
0x2A60	Voltage Reading Ch 20****	R
0x2AE0	Voltage Reading Ch 21****	R
0x2B60	Voltage Reading Ch 22****	R
0x2BE0	Voltage Reading Ch 23****	R
0x2C60	Voltage Reading Ch 24****	R

0x20E4	Current Reading Ch 1****	R
0x2164	Current Reading Ch 2****	R
0x21E4	Current Reading Ch 3****	R
0x2264	Current Reading Ch 4****	R
0x22E4	Current Reading Ch 5****	R
0x2364	Current Reading Ch 6****	R
0x23E4	Current Reading Ch 7****	R
0x2464	Current Reading Ch 8****	R
0x24E4	Current Reading Ch 9****	R
0x2564	Current Reading Ch 10****	R
0x25E4	Current Reading Ch 11****	R
0x2664	Current Reading Ch 12****	R
0x26E4	Current Reading Ch 13****	R
0x2764	Current Reading Ch 14****	R
0x27E4	Current Reading Ch 15****	R
0x2864	Current Reading Ch 16****	R
0x28E4	Current Reading Ch 17****	R
0x2964	Current Reading Ch 18****	R
0x29E4	Current Reading Ch 19****	R
0x2A64	Current Reading Ch 20****	R
0x2AE4	Current Reading Ch 21****	R
0x2B64	Current Reading Ch 22****	R
0x2BE4	Current Reading Ch 23****	R
0x2C64	Current Reading Ch 24****	R

VCC Bank Registers

0x1104	*Select Pull-Up or Pull-Down*	R/W

Pull-Up/Down Current

0x20D0	Pull-Up/Down Current Bank 1 (Ch1-6)****	R/W
0x2150	Pull-Up/Down Current Bank 2 (Ch7-12)****	R/W
0x21D0	Pull-Up/Down Current Bank 3 (Ch13-18)****	R/W
0x2250	Pull-Up/Down Current Bank 4 (Ch19-24)****	R/W

VCC Voltage Reading

0x20EC	VCC Voltage Reading Bank 1 (Ch 1-6)****	R
0x216C	VCC Voltage Reading Bank 2 (Ch 7-12)****	R
0x21EC	VCC Voltage Reading Bank 3 (Ch 13-18)****	R
0x226C	VCC Voltage Reading Bank 4 (Ch 19-24)****	R

Discrete Input/Output Control Registers

0x20D4	*Debounce Time Ch 1*	R/W
0x2154	*Debounce Time Ch 2*	R/W
0x21D4	*Debounce Time Ch 3*	R/W
0x2254	*Debounce Time Ch 4*	R/W
0x22D4	*Debounce Time Ch 5*	R/W
0x2354	*Debounce Time Ch 6*	R/W
0x23D4	*Debounce Time Ch 7*	R/W
0x2454	*Debounce Time Ch 8*	R/W
0x24D4	*Debounce Time Ch 9*	R/W
0x2554	*Debounce Time Ch 10*	R/W
0x25D4	*Debounce Time Ch 11*	R/W
0x2654	*Debounce Time Ch 12*	R/W
0x26D4	*Debounce Time Ch 13*	R/W
0x2754	*Debounce Time Ch 14*	R/W
0x27D4	*Debounce Time Ch 15*	R/W
0x2854	*Debounce Time Ch 16*	R/W
0x28D4	*Debounce Time Ch 17*	R/W
0x2954	*Debounce Time Ch 18*	R/W
0x29D4	*Debounce Time Ch 19*	R/W
0x2A54	*Debounce Time Ch 20*	R/W
0x2AD4	*Debounce Time Ch 21*	R/W
0x2B54	*Debounce Time Ch 22*	R/W
0x2BD4	*Debounce Time Ch 23*	R/W
0x2C54	*Debounce Time Ch 24*	R/W

0x1100	*Overcurrent Reset*	W

Unit Conversion Programming Registers

0x02B4	*Enable Floating Point*	R/W
0x0264	Floating Point State	R

User Watchdog Timer Programming Registers

Refer to “User Watchdog Timer Module Manual” for the User Watchdog Timer Status Function Register Map.

Module Common Registers

Refer to “Module Common Registers Module Manual” for the Module Common Registers Function Register Map.

Status Registers

0x02B0	*Channel Status Enable*	R/W

BIT Status

0x0800	Dynamic Status	R
0x0804	Latched Status*	R/W
0x0808	*Interrupt Enable*	R/W
0x080C	*Set Edge/Level Interrupt*	R/W

Voltage Reading Error

0x1200	Voltage Reading Error Dynamic	R
0x1204	Voltage Reading Error Latched*	R/W
0x1208	Driver Error Dynamic	R
0x120C	Driver Error Latched*	R/W

Background BIT Threshold Programming Registers

0x02B8	*Background BIT Threshold*	R/W
0x02BC	*BIT Count Clear*	W

Status Registers

Low-to-High Transition Status

0x0810	Dynamic Status	R
0x0814	Latched Status*	R/W
0x0818	*Interrupt Enable*	R/W
0x081C	*Set Edge/Level Interrupt*	R/W

High-to-Low Transition Status

0x0820	Dynamic Status	R
0x0824	Latched Status*	R/W
0x0828	*Interrupt Enable*	R/W
0x082C	*Set Edge/Level Interrupt*	R/W

Overcurrent Status

0x0830	Dynamic Status	R
0x0834	Latched Status*	R/W
0x0838	*Interrupt Enable*	R/W
0x083C	*Set Edge/Level Interrupt*	R/W

Above Max High Voltage Status

0x0840	Dynamic Status	R
0x0844	Latched Status*	R/W
0x0848	*Interrupt Enable*	R/W
0x084C	*Set Edge/Level Interrupt*	R/W

Below Min Low Voltage Status

0x0850	Dynamic Status	R
0x0854	Latched Status*	R/W
0x0858	*Interrupt Enable*	R/W
0x085C	*Set Edge/Level Interrupt*	R/W

Mid-Range Voltage Status

0x0860	Dynamic Status	R
0x0864	Latched Status*	R/W
0x0868	*Interrupt Enable*	R/W
0x086C	*Set Edge/Level Interrupt*	R/W

User Watchdog Timer Fault Status

The Discrete Modules provide registers that support User Watchdog Timer capability. Refer to “User Watchdog Timer Module Manual” for the User Watchdog Timer Fault Status Function Register Map.

Summary Status

0x09A0	Dynamic Status	R
0x09A4	Latched Status*	R/W
0x09A8	*Interrupt Enable*	R/W
0x09AC	*Set Edge/Level Interrupt*	R/W

Interrupt Registers

The Interrupt Vector and Interrupt Steering registers are located on the Motherboard Memory Space and do not require any Module Address Offsets. These registers are accessed using the absolute addresses listed in the table below.

0x0500	*Module 1 Interrupt Vector 1 - BIT*	R/W
0x0504	*Module 1 Interrupt Vector 2 - Low-High*	R/W
0x0508	*Module 1 Interrupt Vector 3 - High-Low*	R/W
0x050C	*Module 1 Interrupt Vector 4 - Overcurrent*	R/W
0x0510	*Module 1 Interrupt Vector 5 - Max-High*	R/W
0x0514	*Module 1 Interrupt Vector 6 - Min-Low*	R/W
0x0518	*Module 1 Interrupt Vector 7 - Mid Range*	R/W
0x051C	*Module 1 Interrupt Vector 8 - Reserved*	R/W
0x0520	*Module 1 Interrupt Vector 9 - Inter-FPGA Failure*	R/W
0x0524 to 0x0564	*Module 1 Interrupt Vector 10 - 26 - Reserved*	R/W
0x0568	*Module 1 Interrupt Vector 27 - Summary*	R/W
0x056C	*Module 1 Interrupt Vector 28 - User Watchdog Timer Fault*	R/W
0x0570 to 0x057C	*Module 1 Interrupt Vector 29-32 - Reserved*	R/W

0x0600	*Module 1 Interrupt Steering 1 - BIT*	R/W
0x0604	*Module 1 Interrupt Steering 2 - Low-High*	R/W
0x0608	*Module 1 Interrupt Steering 3 - High-Low*	R/W
0x060C	*Module 1 Interrupt Steering 4 - Overcurrent*	R/W
0x0610	*Module 1 Interrupt Steering 5 - Max-High*	R/W
0x0614	*Module 1 Interrupt Steering 6 - Min-Low*	R/W
0x0618	*Module 1 Interrupt Steering 7 - Mid Range*	R/W
0x061C	*Module 1 Interrupt Steering 8 - Reserved*	R/W
0x0620	*Module 1 Interrupt Steering 9 - Inter-FPGA Failure*	R/W
0x0624 to 0x0664	*Module 1 Interrupt Steering 10 - 26 - Reserved*	R/W
0x0668	*Module 1 Interrupt Steering 27 - Summary*	R/W
0x066C	*Module 1 Interrupt Steering 28 - User Watchdog Timer Fault*	R/W
0x0670 to 0x067C	*Module 1 Interrupt Steering 29-32 - Reserved*	R/W

0x0700	*Module 2 Interrupt Vector 1 - BIT*	R/W
0x0704	*Module 2 Interrupt Vector 2 - Low-High*	R/W
0x0708	*Module 2 Interrupt Vector 3 - High-Low*	R/W
0x070C	*Module 2 Interrupt Vector 4 - Overcurrent*	R/W
0x0710	*Module 2 Interrupt Vector 5 - Max-High*	R/W
0x0714	*Module 2 Interrupt Vector 6 - Min-Low*	R/W
0x0718	*Module 2 Interrupt Vector 7 - Mid Range*	R/W
0x071C	*Module 2 Interrupt Vector 8 - Reserved*	R/W
0x0720	*Module 2 Interrupt Vector 9 - Inter-FPGA Failure*	R/W
0x0724 to 0x0764	*Module 2 Interrupt Vector 10 - 26 - Reserved*	R/W
0x0768	*Module 2 Interrupt Vector 27 - Summary*	R/W
0x076C	*Module 2 Interrupt Vector 28 - User Watchdog Timer Fault*	R/W
0x0770 to 0x077C	*Module 2 Interrupt Vector 29-32 - Reserved*	R/W
0x0800	*Module 2 Interrupt Steering 1 - BIT*	R/W
---	---	---
0x0804	*Module 2 Interrupt Steering 2 - Low-High*	R/W
0x0808	*Module 2 Interrupt Steering 3 - High-Low*	R/W
0x080C	*Module 2 Interrupt Steering 4 - Overcurrent*	R/W
0x0810	*Module 2 Interrupt Steering 5 - Max-High*	R/W
0x0814	*Module 2 Interrupt Steering 6 - Min-Low*	R/W
0x0818	*Module 2 Interrupt Steering 7 - Mid Range*	R/W
0x081C	*Module 2 Interrupt Steering 8 - Reserved*	R/W
0x0820	*Module 2 Interrupt Steering 9 - Inter-FPGA Failure*	R/W
0x0824 to 0x0864	*Module 2 Interrupt Steering 10 - 26 - Reserved*	R/W
0x0868	*Module 2 Interrupt Steering 27 - Summary*	R/W
0x086C	*Module 2 Interrupt Steering 28 - User Watchdog Timer Fault*	R/W
0x0870 to 0x087C	*Module 2 Interrupt Steering 29-32 - Reserved*	R/W

0x0900	*Module 3 Interrupt Vector 1 - BIT*	R/W
0x0904	*Module 3 Interrupt Vector 2 - Low-High*	R/W
0x0908	*Module 3 Interrupt Vector 3 - High-Low*	R/W
0x090C	*Module 3 Interrupt Vector 4 - Overcurrent*	R/W
0x0910	*Module 3 Interrupt Vector 5 - Max-High*	R/W
0x0914	*Module 3 Interrupt Vector 6 - Min-Low*	R/W
0x0918	*Module 3 Interrupt Vector 7 - Mid Range*	R/W
0x091C	*Module 3 Interrupt Vector 8 - Reserved*	R/W
0x0920	*Module 3 Interrupt Vector 9 - Inter-FPGA Failure*	R/W
0x0924 to 0x0964	*Module 3 Interrupt Vector 10 - 26 - Reserved*	R/W
0x0968	*Module 3 Interrupt Vector 27 - Summary*	R/W
0x096C	*Module 3 Interrupt Vector 28 - User Watchdog Timer Fault*	R/W
0x0970 to 0x097C	*Module 3 Interrupt Vector 29-32 - Reserved*	R/W

0x0A00	*Module 3 Interrupt Steering 1 - BIT*	R/W
0x0A04	*Module 3 Interrupt Steering 2 - Low-High*	R/W
0x0A08	*Module 3 Interrupt Steering 3 - High-Low*	R/W
0x0A0C	*Module 3 Interrupt Steering 4 - Overcurrent*	R/W
0x0A10	*Module 3 Interrupt Steering 5 - Max-High*	R/W
0x0A14	*Module 3 Interrupt Steering 6 - Min-Low*	R/W
0x0A18	*Module 3 Interrupt Steering 7 - Mid Range*	R/W
0x0A1C	*Module 3 Interrupt Steering 8 - Reserved*	R/W
0x0A20	*Module 3 Interrupt Steering 9 - Inter-FPGA Failure*	R/W
0x0A24 to 0x0A64	*Module 3 Interrupt Steering 10 - 26 - Reserved*	R/W
0x0A68	*Module 3 Interrupt Steering 27 - Summary*	R/W
0x0A6C	*Module 3 Interrupt Steering 28 - User Watchdog Timer Fault*	R/W
0x0A70 to 0x0A7C	*Module 3 Interrupt Steering 29-32 - Reserved*	R/W

0x0B00	*Module 4 Interrupt Vector 1 - BIT*	R/W
0x0B04	*Module 4 Interrupt Vector 2 - Low-High*	R/W
0x0B08	*Module 4 Interrupt Vector 3 - High-Low*	R/W
0x0B0C	*Module 4 Interrupt Vector 4 - Overcurrent*	R/W
0x0B10	*Module 4 Interrupt Vector 5 - Max-High*	R/W
0x0B14	*Module 4 Interrupt Vector 6 - Min-Low*	R/W
0x0B18	*Module 4 Interrupt Vector 7 - Mid Range*	R/W
0x0B1C	*Module 4 Interrupt Vector 8 - Reserved*	R/W
0x0B20	*Module 4 Interrupt Vector 9 - Inter-FPGA Failure*	R/W
0x0B24 to 0x0B64	*Module 4 Interrupt Vector 10 - 26 - Reserved*	R/W
0x0B68	*Module 4 Interrupt Vector 27 - Summary*	R/W
0x0B6C	*Module 4 Interrupt Vector 28 - User Watchdog Timer Fault*	R/W
0x0B70 to 0x0B7C	*Module 4 Interrupt Vector 29-32 - Reserved*	R/W

0x0C00	*Module 4 Interrupt Steering 1 - BIT*	R/W
0x0C04	*Module 4 Interrupt Steering 2 - Low-High*	R/W
0x0C08	*Module 4 Interrupt Steering 3 - High-Low*	R/W
0x0C0C	*Module 4 Interrupt Steering 4 - Overcurrent*	R/W
0x0C10	*Module 4 Interrupt Steering 5 - Max-High*	R/W
0x0C14	*Module 4 Interrupt Steering 6 - Min-Low*	R/W
0x0C18	*Module 4 Interrupt Steering 7 - Mid Range*	R/W
0x0C1C	*Module 4 Interrupt Steering 8 - Reserved*	R/W
0x0C20	*Module 4 Interrupt Steering 9 -Inter-FPGA Failure*	R/W
0x0C24 to 0x0C64	*Module 4 Interrupt Steering 10 - 26 - Reserved*	R/W
0x0668	*Module 4 Interrupt Steering 27 - Summary*	R/W
0x0C6C	*Module 4 Interrupt Steering 28 - User Watchdog Timer Fault*	R/W
0x0C70 to 0x0C7C	*Module 4 Interrupt Steering 29-32 - Reserved*	R/W

0x0D00	*Module 5 Interrupt Vector 1 - BIT*	R/W
0x0D04	*Module 5 Interrupt Vector 2 - Low-High*	R/W
0x0D08	*Module 5 Interrupt Vector 3 - High-Low*	R/W
0x0D0C	*Module 5 Interrupt Vector 4 - Overcurrent*	R/W
0x0D10	*Module 5 Interrupt Vector 5 - Max-High*	R/W
0x0D14	*Module 5 Interrupt Vector 6 - Min-Low*	R/W
0x0D18	*Module 5 Interrupt Vector 7 - Mid Range*	R/W
0x0D1C	*Module 5 Interrupt Vector 8 - Reserved*	R/W
0x0D20	*Module 5 Interrupt Vector 9 - Inter-FPGA Failure*	R/W
0x0D24 to 0x0D64	*Module 5 Interrupt Vector 10 - 26 - Reserved*	R/W
0x0D68	*Module 5 Interrupt Vector 27 - Summary*	R/W
0x0D6C	*Module 5 Interrupt Vector 28 - User Watchdog Timer Fault*	R/W
0x0D70 to 0x0D7C	*Module 5 Interrupt Vector 29-32 - Reserved*	R/W

0x0E00	*Module 5 Interrupt Steering 1 - BIT*	R/W
0x0E04	*Module 5 Interrupt Steering 2 - Low-High*	R/W
0x0E08	*Module 5 Interrupt Steering 3 - High-Low*	R/W
0x0E0C	*Module 5 Interrupt Steering 4 - Overcurrent*	R/W
0x0E10	*Module 5 Interrupt Steering 5 - Max-High*	R/W
0x0E14	*Module 5 Interrupt Steering 6 - Min-Low*	R/W
0x0E18	*Module 5 Interrupt Steering 7 - Mid Range*	R/W
0x0E1C	*Module 5 Interrupt Steering 8 - Reserved*	R/W
0x0E20	*Module 5 Interrupt Steering 9 - Inter-FPGA Failure*	R/W
0x0E24 to 0x0E64	*Module 5 Interrupt Steering 10 - 26 - Reserved*	R/W
0x0E68	*Module 5 Interrupt Steering 27 - Summary*	R/W
0x0E6C	*Module 5 Interrupt Steering 28 - User Watchdog Timer Fault*	R/W
0x0E70 to 0x0E7C	*Module 5 Interrupt Steering 29-32 - Reserved*	R/W

0x0F00	*Module 6 Interrupt Vector 1 - BIT*	R/W
0x0F04	*Module 6 Interrupt Vector 2 - Low-High*	R/W
0x0F08	*Module 6 Interrupt Vector 3 - High-Low*	R/W
0x0F0C	*Module 6 Interrupt Vector 4 - Overcurrent*	R/W
0x0F10	*Module 6 Interrupt Vector 5 - Max-High*	R/W
0x0F14	*Module 6 Interrupt Vector 6 - Min-Low*	R/W
0x0F18	*Module 6 Interrupt Vector 7 - Mid Range*	R/W
0x0F1C	*Module 6 Interrupt Vector 8 - Reserved*	R/W
0x0F20	*Module 6 Interrupt Vector 9 - Inter-FPGA Failure*	R/W
0x0F24 to 0x0F64	*Module 6 Interrupt Vector 10 - 26 - Reserved*	R/W
0x0F68	*Module 6 Interrupt Vector 27 - Summary*	R/W
0x0F6C	*Module 6 Interrupt Vector 28 - User Watchdog Timer Fault*	R/W
0x0F70 to 0x0F7C	*Module 6 Interrupt Vector 29-32 - Reserved*	R/W

0x1000	*Module 6 Interrupt Steering 1 - BIT*	R/W
0x1004	*Module 6 Interrupt Steering 2 - Low-High*	R/W
0x1008	*Module 6 Interrupt Steering 3 - High-Low*	R/W
0x1010	*Module 6 Interrupt Steering 5 - Max-High*	R/W
0x1014	*Module 6 Interrupt Steering 6 - Min-Low*	R/W
0x1018	*Module 6 Interrupt Steering 7 - Mid Range*	R/W
0x1020	*Module 6 Interrupt Steering 9 - Inter-FPGA Failure*	R/W
0x1024 to 0x1064	*Module 6 Interrupt Steering 10 - 26 - Reserved*	R/W
0x1068	*Module 6 Interrupt Steering 27 - Summary*	R/W
0x106C	*Module 6 Interrupt Steering 28 - User WatchdogTimer Fault*	R/W
0x1070 to 0x107C	*Module 6 Interrupt Steering 29-32 - Reserved*	R/W

0x1100	*Module 7 Interrupt Vector 1 - BIT*	R/W
0x1104	*Module 7 Interrupt Vector 2 - Low-High*	R/W
0x1108	*Module 7 Interrupt Vector 3 - High-Low*	R/W
0x110C	*Module 7 Interrupt Vector 4 - Overcurrent*	R/W
0x1110	*Module 7 Interrupt Vector 5 - Max-High*	R/W
0x1114	*Module 7 Interrupt Vector 6 - Min-Low*	R/W
0x1118	*Module 7 Interrupt Vector 7 - Mid Range*	R/W
0x111C	*Module 7 Interrupt Vector 8 - Reserved*	R/W
0x1120	*Module 7 Interrupt Vector 9 - Inter-FPGA Failure*	R/W
0x1124 to 0x1164	*Module 7 Interrupt Vector 10 - 26 - Reserved*	R/W
0x1168	*Module 7 Interrupt Vector 27 - Summary*	R/W
0x116C	*Module 7 Interrupt Vector 28 - User Watchdog Timer Fault*	R/W
0x1170 to 0x117C	*Module 7 Interrupt Vector 29-32 - Reserved*	R/W

0x1200	*Module 7 Interrupt Steering 1 - BIT*	R/W
0x1204	*Module 7 Interrupt Steering 2 - Low-High*	R/W
0x1208	*Module 7 Interrupt Steering 3 - High-Low*	R/W
0x120C	*Module 7 Interrupt Steering 4 - Overcurrent*	R/W
0x1210	*Module 7 Interrupt Steering 5 - Max-High*	R/W
0x1214	*Module 7 Interrupt Steering 6 - Min-Low*	R/W
0x1218	*Module 7 Interrupt Steering 7 - Mid Range*	R/W
0x121C	*Module 7 Interrupt Steering 8 - Reserved*	R/W
0x1220	*Module 7 Interrupt Steering 9 - Inter-FPGA Failure*	R/W
0x1224 to 0x1264	*Module 7 Interrupt Steering 10 - 26 - Reserved*	R/W
0x1268	*Module 7 Interrupt Steering 27 - Summary*	R/W
0x126C	*Module 7 Interrupt Steering 28 - User Watchdog Timer Fault*	R/W
0x1270 to 0x127C	*Module 7 Interrupt Steering 29-32 - Reserved*	R/W

APPENDIX A: REGISTER NAME CHANGES FROM PREVIOUS RELEASES

This section provides a mapping of the register names used in this document against register names used in previous releases.

Rev C2 - Register Names	Rev B - Register Names
Discrete Input/Output Registers
I/O Format Ch1-16	Input/Output Format Low
I/O Format Ch17-24	Input/Output Format High
Write Outputs	Write Outputs
Input/Output State	Input/Output State
Discrete I/O Threshold Programming Registers
Max High Voltage Threshold	Max High Threshold
Upper Voltage Threshold	Upper Threshold
Lower Voltage Threshold	Lower Threshold
Min Low Voltage Threshold	Min Low Threshold
Discrete I/O Input/Output Measurement Registers
Voltage Reading	Voltage Reading
Current Reading	Current Reading
VCC Bank Registers
Select Pull-Up or Pull-Down	Select Pullup or Pulldown
Pull-Up/Down Current	Current for Source/Sink
VCC Voltage Reading	VCC Bank Reading
Discrete Input/Output Control Registers
Debounce Time	Debounce Time
Overcurrent Reset	Overcurrent Reset
Unit Conversion Registers
Enable Floating Point Mode	Enable Floating Point Mode
Floating Point State	Floating Point State
Background BIT Threshold Programming Registers
Background BIT Threshold	Background BIT Threshold
BIT Count Clear	Reset BIT
User Watchdog Timer Programming Registers
Refer to “User Watchdog Timer Module Manual”	Refer to “User Watchdog Timer Module Manual”
Status and Interrupt Registers
Channel Status Enable	Channel Status Enabled
BIT Dynamic Status	BIT Dynamic Status
BIT Latched Status	BIT Latched Status
BIT Interrupt Enable	BIT Interrupt Enable
BIT Set Edge/Level Interrupt	BIT Set Edge/Level Interrupt
Voltage Reading Error Dynamic	Voltage Reading Error Dynamic
Voltage Reading Error Latched	Voltage Reading Error Latched
Drive Error Dynamic	Drive Error Dynamic
Drive Error Latched	Drive Error Latched
Low-to-High Transition Dynamic Status	Low-to-High Transition Dynamic Status
Low-to-High Transition Latched Status	Low-to-High Transition Latched Status
Low-to-High Transition Interrupt Enable	Low-to-High Transition Interrupt Enable
Low-to-High Transition Set Edge/Level Interrupt	Low-to-High Transition Set Edge/Level Interrupt
High-to-Low Transition Dynamic Status	High-to-Low Transition Dynamic Status
High-to-Low Transition Latched Status	High-to-Low Transition Latched Status
High-to-Low Transition Interrupt Enable	High-to-Low Transition Interrupt Enable
High-to-Low Transition Set Edge/Level Interrupt	High-to-Low Transition Set Edge/Level Interrupt
Overcurrent Dynamic Status	Overcurrent Dynamic Status
Overcurrent Latched Status	Overcurrent Latched Status
Overcurrent Interrupt Enable	Overcurrent Interrupt Enable
Overcurrent Set Edge/Level Interrupt	Overcurrent Set Edge/Level Interrupt
Above Max High Voltage Dynamic Status	Above Max High Threshold Dynamic Status
Above Max High Voltage Latched Status	Above Max High Threshold Latched Status
Above Max High Voltage Interrupt Enable	Above Max High Threshold Interrupt Enable
Above Max High Voltage Set Edge/Level Interrupt	Above Max High Threshold Set Edge/Level Interrupt
Below Min Low Voltage Dynamic Status	Below Min Low Threshold Dynamic Status
Below Min Low Voltage Latched Status	Below Min Low Threshold Latched Status
Below Min Low Voltage Interrupt Enable	Below Min Low Threshold Interrupt Enable
Below Min Low Voltage Set Edge/Level Interrupt	Below Min Low Threshold Set Edge/Level Interrupt
Mid-Range Voltage Dynamic Status	Mid-Range Dynamic Status
Mid-Range Voltage Latched Status	Mid-Range Latched Status
Mid-Range Voltage Interrupt Enable	Mid-Range Interrupt Enable
Mid-Range Voltage Set Edge/Level Interrupt	Mid-Range Set Edge/Level Interrupt
User Watchdog Timer Fault Dynamic Status	User Watchdog Timer Fault Dynamic Status
User Watchdog Timer Fault Latched Status	User Watchdog Timer Fault Latched Status
User Watchdog Timer Fault Interrupt Enable	User Watchdog Timer Fault Interrupt Enable
User Watchdog Timer Fault Set Edge/Level Interrupt	User Watchdog Timer Fault Set Edge/Level Interrupt
Summary Dynamic Status	Summary Dynamic Status
Summary Latched Status	Summary Latched Status
Summary Interrupt Enable	Summary Interrupt Enable
Summary Set Edge/Level Interrupt	Summary Set Edge/Level Interrupt

APPENDIX B: PIN-OUT DETAILS

Pin-out details (for reference) are shown below, with respect to DATAIO. Additional information on pin-outs can be found in the Motherboard Operational Manuals.

Module Signal(Ref Only)	44-Pin I/O	50-Pin I/O (Mod Slot 1-J3)	50-Pin I/O (Mod Slot 2-J4)	50-Pin I/O (Mod Slot 3-J3)	50-Pin I/O (Mod Slot 3-J4)	Discrete (DT1/4)
DATIO1	2	10	1	2		IO-CH01
DATIO2	24	35	26	27		IO-CH02
DATIO3	3	11	2	3		IO-CH03
DATIO4	25	36	27	28		IO-CH04
DATIO5	5	13	4	5		VCC1 (1-6)
DATIO6	27	38	29	30		GND
DATIO7	7	14	5	6		IO-CH07
DATIO8	29	39	30	31		IO-CH08
DATIO9	8	15	6	7		IO-CH09
DATIO10	30	40	31	32		IO-CH10
DATIO11	10	17	8	9		VCC2 (7-12)
DATIO12	32	42	33	34		GND
DATIO13	12	18	9		17	IO-CH13
DATIO14	34	43	34		42	IO-CH14
DATIO15	13	19	10		18	IO-CH15
DATIO16	35	44	35		43	IO-CH16
DATIO17	15	21	12		20	VCC3 (13-18)
DATIO18	37	46	37		45	GND
DATIO19	17	22	13		21	IO-CH19
DATIO20	39	47	38		46	IO-CH20
DATIO21	18	23	14		22	IO-CH21
DATIO22	40	48	39		47	IO-CH22
DATIO23	20	25	16		24	VCC4 (19-24)
DATIO24	42	50	41		49	GND
DATIO25	4	12	3	4		IO-CH05
DATIO26	26	37	28	29		IO-CH06
DATIO27	9	16	7	8		IO-CH11
DATIO28	31	41	32	33		IO-CH12
DATIO29	14	20	11		19	IO-CH17
DATIO30	36	45	36		44	IO-CH18
DATIO31	19	24	15		23	IO-CH23
DATIO32	41	49	40		48	IO-CH24
DATIO33	6					VCC1 (1-6)
DATIO34	28					GND
DATIO35	11					VCC2 (7-12)
DATIO36	33					GND
DATIO37	16					VCC3 (13-18)
DATIO38	38					GND
DATIO39	21					VCC4 (19-24)
DATIO40	43					GND
N/A

DISCRETE INPUT/OUTPUT HARDWARE BLOCK DIAGRAM

DISCRETE INPUT/OUTPUT PROCESSING BLOCK DIAGRAM

FIRMWARE REVISION NOTES

This section identifies the firmware revision in which specific features were released. Prior revisions of the firmware would not support the features listed.

Feature	FPGA		Bare Metal (BM)
	Firmware Revision	Release Date	Firmware Revision	Release Date
Unit Conversions	1.00013	12/18/2019 4:08:53 PM	2.6	Jan 09 2020 at 09:19:09
Background BIT Threshold Programming	1.00013	12/18/2019 4:08:53 PM	2.6	Jan 09 2020 at 09:19:09
User Watchdog Timer Capability	1.00013	12/18/2019 4:08:53 PM	2.6	Jan 09 2020 at 09:19:09
Channel Status Enabled	1.00013	12/18/2019 4:08:53 PM	2.6	Jan 09 2020 at 09:19:09
Summary Status	1.00013	12/18/2019 4:08:53 PM	2.6	Jan 09 2020 at 09:19:09

STATUS AND INTERRUPTS

Status registers indicate the detection of faults or events. The status registers can be channel bit-mapped or event bit-mapped. An example of a channel bit-mapped register is the BIT status register, and an example of an event bit-mapped register is the FIFO status register.

For those status registers that allow interrupts to be generated upon the detection of the fault or the event, there are four registers associated with each status: Dynamic, Latched, Interrupt Enabled, and Set Edge/Level Interrupt.

Dynamic Status: The Dynamic Status register indicates the current condition of the fault or the event. If the fault or the event is momentary, the contents in this register will be clear when the fault or the event goes away. The Dynamic Status register can be polled, however, if the fault or the event is sporadic, it is possible for the indication of the fault or the event to be missed.

Latched Status: The Latched Status register indicates whether the fault or the event has occurred and keeps the state until it is cleared by the user. Reading the Latched Status register is a better alternative to polling the Dynamic Status register because the contents of this register will not clear until the user commands to clear the specific bit(s) associated with the fault or the event in the Latched Status register. Once the status register has been read, the act of writing a 1 back to the applicable status register to any specific bit (channel/event) location will “clear” the bit (set the bit to 0). When clearing the channel/event bits, it is strongly recommended to write back the same bit pattern as read from the Latched Status register. For example, if the channel bit-mapped Latched Status register contains the value 0x0000 0005, which indicates fault/event detection on channel 1 and 3, write the value 0x0000 0005 to the Latched Status register to clear the fault/event status for channel 1 and 3. Writing a “1” to other channels that are not set (example 0x0000 000F) may result in incorrectly “clearing” incoming faults/events for those channels (example, channel 2 and 4).

Interrupt Enable: If interrupts are preferred upon the detection of a fault or an event, enable the specific channel/event interrupt in the Interrupt Enable register. The bits in Interrupt Enable register map to the same bits in the Latched Status register. When a fault or event occurs, an interrupt will be fired. Subsequent interrupts will not trigger until the application acknowledges the fired interrupt by clearing the associated channel/event bit in the Latched Status register. If the interruptible condition is still persistent after clearing the bit, this may retrigger the interrupt depending on the Edge/Level setting.

Set Edge/Level Interrupt: When interrupts are enabled, the condition on retriggering the interrupt after the Latch Register is “cleared” can be specified as “edge” triggered or “level” triggered. Note, the Edge/Level Trigger also affects how the Latched Register value is adjusted after it is “cleared” (see below).

Edge triggered: An interrupt will be retriggered when the Latched Status register change from low (0) to high (1) state. Uses for edge-triggered interrupts would include transition detections (Low-to-High transitions, High-to-Low transitions) or fault detections. After “clearing” an interrupt, another interrupt will not occur until the next transition or the re-occurrence of the fault again.

Level triggered: An interrupt will be generated when the Latched Status register remains at the high (1) state. Level-triggered interrupts are used to indicate that something needs attention.

Interrupt Vector and Steering

When interrupts are enabled, the interrupt vector associated with the specific interrupt can be programmed with a unique number/identifier defined by the user such that it can be utilized in the Interrupt Service Routine (ISR) to identify the type of interrupt. When an interrupt occurs, the contents of the Interrupt Vector registers is reported as part of the interrupt mechanism. In addition to specifying the interrupt vector, the interrupt can be directed (“steered”) to the native bus or to the application running on the onboard ARM processor.

Interrupt Trigger Types

In most applications, limiting the number of interrupts generated is preferred as interrupts are costly, thus choosing the correct Edge/Level interrupt trigger to use is important.

Example 1: Fault detection

This example illustrates interrupt considerations when detecting a fault like an “open” on a line. When an “open” is detected, the system will receive an interrupt. If the “open” on the line is persistent and the trigger is set to “edge”, upon “clearing” the interrupt, the system will not regenerate another interrupt. If, instead, the trigger is set to “level”, upon “clearing” the interrupt, the system will re-generate another interrupt. Thus, in this case, it will be better to set the trigger type to “edge”.

Example 2: Threshold detection

This example illustrates interrupt considerations when detecting an event like reaching or exceeding the “high watermark” threshold value. In a communication device, when the number of elements received in the FIFO reaches the high-watermark threshold, an interrupt will be generated. Normally, the application would read the count of the number of elements in the FIFO and read this number of elements from the FIFO. After reading the FIFO data, the application would “clear” the interrupt. If the trigger type is set to “edge”, another interrupt will be generated only if the number of elements in FIFO goes below the “high watermark” after the “clearing” the interrupt and then fills up to reach the “high watermark” threshold value. Since receiving communication data is inherently asynchronous, it is possible that data can continue to fill the FIFO as the application is pulling data off the FIFO. If, at the time the interrupt is “cleared”, the number of elements in the FIFO is at or above the “high watermark”, no interrupts will be generated. In this case, it will be better to set the trigger type to “level”, as the purpose here is to make sure that the FIFO is serviced when the number of elements exceeds the high watermark threshold value. Thus, upon “clearing” the interrupt, if the number of elements in the FIFO is at or above the “high watermark” threshold value, another interrupt will be generated indicating that the FIFO needs to be serviced.

Dynamic and Latched Status Registers Examples

The examples in this section illustrate the differences in behavior of the Dynamic Status and Latched Status registers as well as the differences in behavior of Edge/Level Trigger when the Latched Status register is cleared.

Figure 1. Example of Module’s Channel-Mapped Dynamic and Latched Status States

No Clearing of Latched Status Clearing of Latched Status (Edge-Triggered) Clearing of Latched Status(Level-Triggered)
Time Dynamic Status Latched Status Action Latched Status Action Latched
T0 0x0 0x0 Read Latched Register 0x0 Read Latched Register 0x0
T1 0x1 0x1 Read Latched Register 0x1 0x1
T1 0x1 0x1 Write 0x1 to Latched Register Write 0x1 to Latched Register
T1 0x1 0x1 0x0 0x1
T2 0x0 0x1 Read Latched Register 0x0 Read Latched Register 0x1
T2 0x0 0x1 Read Latched Register 0x0 Write 0x1 to Latched Register
T2 0x0 0x1 Read Latched Register 0x0 0x0
T3 0x2 0x3 Read Latched Register 0x2 Read Latched Register 0x2
T3 0x2 0x3 Write 0x2 to Latched Register Write 0x2 to Latched Register
T3 0x2 0x3 0x0 0x2
T4 0x2 0x3 Read Latched Register 0x1 Read Latched Register 0x3
T4 0x2 0x3 Write 0x1 to Latched Register Write 0x3 to Latched Register
T4 0x2 0x3 0x0 0x2
T5 0xC 0xF Read Latched Register 0xC Read Latched Register 0xE
T5 0xC 0xF Write 0xC to Latched Register Write 0xE to Latched Register
T5 0xC 0xF 0x0 0xC
T6 0xC 0xF Read Latched Register 0x0 Read Latched 0xC
T6 0xC 0xF Read Latched Register 0x0 Write 0xC to Latched Register
T6 0xC 0xF Read Latched Register 0x0 0xC
T7 0x4 0xF Read Latched Register 0x0 Read Latched Register 0xC
T7 0x4 0xF Read Latched Register 0x0 Write 0xC to Latched Register
T7 0x4 0xF Read Latched Register 0x0 0x4
T8 0x4 0xF Read Latched Register 0x0 Read Latched Register 0x4

Interrupt Examples

The examples in this section illustrate the interrupt behavior with Edge/Level Trigger.

Figure 2. Illustration of Latched Status State for Module with 4-Channels with Interrupt Enabled

Time Latched Status (Edge-Triggered - Clear Multi-Channel) Latched Status (Edge-Triggered - Clear Single Channel) 2+ Latched Status (Level-Triggered - Clear Multi-Channel) Action
Latched Action Latched Action Latched T1 (Int 1)
Interrupt Generated++``+
Read Latched Registers 0x1 Interrupt Generated++``+
Read Latched Registers 0x1 Interrupt Generated++``+
Read Latched Registers 0x1 T1 (Int 1)
Write 0x1 to Latched Register Write 0x1 to Latched Register Write 0x1 to Latched Register T1 (Int 1)
0x0 0x0 Interrupt re-triggers++``+
Note, interrupt re-triggers after each clear until T2. 0x1 T3 (Int 2)
Interrupt Generated++``+
Read Latched Registers 0x2 Interrupt Generated++``+
Read Latched Registers 0x2 Interrupt Generated++``+
Read Latched Registers 0x2 T3 (Int 2)
Write 0x2 to Latched Register Write 0x2 to Latched Register Write 0x2 to Latched Register T3 (Int 2)
0x0 0x0 Interrupt re-triggers++``+
Note, interrupt re-triggers after each clear until T7. 0x2 T4 (Int 3)
Interrupt Generated++``+
Read Latched Registers 0x1 Interrupt Generated++``+
Read Latched Registers 0x1 Interrupt Generated++``+
Read Latched Registers 0x3 T4 (Int 3)
Write 0x1 to Latched Register Write 0x1 to Latched Register Write 0x3 to Latched Register T4 (Int 3)
0x0 0x0 Interrupt re-triggers++``+
Note, interrupt re-triggers after each clear and 0x3 is reported in Latched Register until T5. 0x3 T4 (Int 3)
0x0 0x0 Interrupt re-triggers++``+
Note, interrupt re-triggers after each clear until T7. 0x2 T6 (Int 4)
Interrupt Generated++``+
Read Latched Registers 0xC Interrupt Generated++``+
Read Latched Registers 0xC Interrupt Generated++``+
Read Latched Registers 0xE T6 (Int 4)
Write 0xC to Latched Register Write 0x4 to Latched Register Write 0xE to Latched Register T6 (Int 4)
0x0 Interrupt re-triggers++``+
Write 0x8 to Latched Register 0x8 Interrupt re-triggers++``+
Note, interrupt re-triggers after each clear and 0xE is reported in Latched Register until T7. 0xE T6 (Int 4)
0x0 0x0 Interrupt re-triggers++``+
Note, interrupt re-triggers after each clear and 0xC is reported in Latched Register until T8. 0xC T6 (Int 4)
0x0 0x0 Interrupt re-triggers++``+
Note, interrupt re-triggers after each clear and 0x4 is reported in Latched Register always. 0x4

REVISION HISTORY

Motherboard Manual - Status and Interrupts Revision History
Revision Revision Date Description
C 2021-11-30 C08896; Transition manual to docbuilder format - no technical info change.

DOCS.NAII REVISIONS

Revision Date Description
2026-03-02 Formatting updates to document; no technical changes.
Link to original

USER WATCHDOG TIMER MODULE MANUAL

User Watchdog Timer Capability

The User Watchdog Timer (UWDT) Capability is available on the following modules:

AC Reference Source Modules

AC1 - 1 Channel, 2-115 Vrms, 47 Hz - 20kHz

AC2 - 2 Channels, 2-28 Vrms, 47 Hz - 20kHz

AC3 - 1 Channel, 28-115 Vrms, 47 Hz - 2.5 kHz

Differential Transceiver Modules

DF1/DF2 - 16 Channels Differential I/O

Digital-to-Analog (D/A) Modules

DA1 - 12 Channels, ±10 VDC @ 25 mA, Voltage or Current Control Modes

DA2 - 16 Channels, ±10 VDC @ 10 mA

DA3 - 4 Channels, ±40 VDC @ ±100 mA, Voltage or Current Control Modes

DA4 - 4 Channels, ±80 VDC @ 10 mA

DA5 - 4 Channels, ±65 VDC or ±2 A, Voltage or Current Control Modes

Digital-to-Synchro/Resolver (D/S) or Digital-to-L( R )VDT (D/LV) Modules

(Not supported)

Discrete I/O Modules

DT1/DT4 - 24 Channels, Programmable for either input or output, output up to 500 mA per channel from an applied external 3 - 60 VCC source.

DT2/DT5 - 16 Channels, Programmable for either input voltage measurements (±80 V) or as a bi-directional current switch (up to 500 mA per channel).

DT3/DT6 - 4 Channels, Programmable for either input voltage measurements (±100 V) or as a bi-directional current switch (up to 3 A per channel).

TTL/CMOS Modules

TL1-TL8 - 24 Channels, Programmable for either input or output.

Principle of Operation

The User Watchdog Timer is optionally activated by the applications that require the module’s outputs to be disabled as a failsafe in the event of an application failure or crash. The circuit is designed such that a specific periodic write strobe pattern must be executed by the software to maintain operation and prevent the disablement from taking place.

The User Watchdog Timer is inactive until the application sends an initial strobe by writing the value 0x55AA to the UWDT Strobe register. After activating the User Watchdog Timer, the application must continually strobe the timer within the intervals specified with the configurable UWDT Quiet Time and UWDT Window registers. The timing of the strobes must be consistent with the following rules:

The application must not strobe during the Quiet time.

The application must strobe within the Window time.

The application must not strobe more than once in a single window time.

A violation of any of these rules will trigger a User Watchdog Timer fault and result in shutting down any isolated power supplies and/or disabling any active drive outputs, as applicable for the specific module. Upon a User Watchdog Timer event, recovery to the module shutting down will require the module to be reset.

The Figure 1 and Figure 2 provides an overview and an example with actual values for the User Watchdog Timer Strobes, Quiet Time and Window. As depicted in the diagrams, there are two processes that run in parallel. The Strobe event starts the timer for the beginning of the “Quiet Time”. The timer for the Previous Strobe event continues to run to ensure that no additional Strobes are received within the “Window” associated with the Previous Strobe.

The optimal target for the user watchdog strobes should be at the interval of [Quiet time + ½ Window time] after the previous strobe, which will place the strobe in the center of the window. This affords the greatest margin of safety against unintended disablement in critical operations.

Figure 1. User Watchdog Timer Overview

Figure 2. User Watchdog Timer Example

Figure 3. User Watchdog Timer Failures

Register Descriptions

The register descriptions provide the register name, Type, Data Range, Read or Write information, Initialized Value, and a description of the function.

User Watchdog Timer Registers

The registers associated with the User Watchdog Timer provide the ability to specify the UWDT Quiet Time and the UWDT Window that will be monitored to ensure that EXACTLY ONE User Watchdog Timer (UWDT) Strobe is written within the window.

UWDT Quiet Time
Function: Sets Quiet Time value (in microseconds) to use for the User Watchdog Timer Frame.
Type: unsigned binary word (32-bit)
Data Range: 0 µsec to 2^32 µsec (0x0 to 0xFFFFFFFF)
Read/Write: R/W
Initialized Value: 0x0
Operational Settings: LSB = 1 µsec. The application must NOT write a strobe in the time between the previous strobe and the end of the Quiet time interval. In addition, the application must write in the UWDT Window EXACTLY ONCE.
UWDT Window
Function: Writes the window value (in microseconds) to be used for the User Watchdog Timer Frame.
Type: unsigned binary word (32-bit)
Data Range: 0 µsec to 2^32 µsec (0x0 to 0xFFFFFFFF)
Read/Write: R/W
Initialized Value: 0x0
Operational Settings: LSB = 1 µsec. The application must write the strobe once within the Window time after the end of the Quiet time interval. The application must write in the UWDT Window EXACTLY ONCE. This setting must be initialized to a non-zero value for operation and should allow sufficient tolerance for strobe timing by the application.
UWDT Strobe
Function: Writes the strobe value to be use for the User Watchdog Timer Frame.
Type: unsigned binary word (32-bit)
Data Range: 0x55AA
Read/Write: W
Initialized Value: 0x0
Operational Settings: At startup, the user watchdog is disabled. Write the value of 0x55AA to this register to start the user watchdog timer monitoring after initial power on or a reset. To prevent a disablement, the application must periodically write the strobe based on the user watchdog timer rules.

Status and Interrupt

The modules that are capable of User Watchdog Timer support provide status registers for the User Watchdog Timer.

User Watchdog Timer Status

The status register that contains the User Watchdog Timer Fault information is also used to indicate channel Inter-FPGA failures on modules that have communication between FPGA components. There are four registers associated with the User Watchdog Timer Fault/Inter-FPGA Failure Status: Dynamic, Latched, Interrupt Enable, and Set Edge/Level Interrupt.

Function: Sets the corresponding bit (D31) associated with the channel’s User Watchdog Timer Fault error.
Type: unsigned binary word (32-bit)
Data Range: 0x0000 0000 to 0xFFFF FFFF
Read/Write: R (Dynamic), R/W (Latched, Interrupt Enable, Set Edge/Level Interrupt)
Initialized Value: 0

User Watchdog Timer Fault/Inter-FPGA Failure Dynamic Status
User Watchdog Timer Fault/Inter-FPGA Failure Latched Status
User Watchdog Timer Fault/Inter-FPGA Failure Interrupt Enable
User Watchdog Timer Fault/Inter-FPGA Failure Set Edge/Level Interrupt
Bit(s) Status Description
D31 User Watchdog Timer Fault Status 0 = No Fault + 1 = User Watchdog Timer Fault
D30:D0 Reserved for Inter-FPGA Failure Status Channel bit-mapped indicating channel inter FPGA communication failure detection.

Interrupt Vector and Steering

When interrupts are enabled, the interrupt vector associated with the specific interrupt can be programmed (typically with a unique number/identifier) such that it can be utilized in the Interrupt Service Routine (ISR) to identify the type of interrupt. When an interrupt occurs, the contents of the Interrupt Vector registers is reported as part of the interrupt mechanism.

In addition to specifying the interrupt vector, the interrupt can be directed (“steered”) to the native bus or to the application running on the onboard ARM processor.

Note

the Interrupt Vector and Interrupt Steering registers are mapped to the Motherboard Common Memory and these registers are associated with the Module Slot position (refer to Function Register Map).

Interrupt Vector
Function: Set an identifier for the interrupt.
Type: unsigned binary word (32-bit)
Data Range: 0 to 0xFFFF FFFF
Read/Write: R/W
Initialized Value: 0
Operational Settings: When an interrupt occurs, this value is reported as part of the interrupt mechanism.
Interrupt Steering
Function: Sets where to direct the interrupt.
Type: unsigned binary word (32-bit)
Data Range: See table
Read/Write: R/W
Initialized Value: 0
Operational Settings: When an interrupt occurs, the interrupt is sent as specified:

Direct Interrupt to VME 1
Direct Interrupt to ARM Processor (via SerDes)
(Custom App on ARM or NAI Ethernet Listener App) 2
Direct Interrupt to PCIe Bus 5
Direct Interrupt to cPCI Bus 6

Function Register Map

KEY

Configuration/Control
Measurement/Status

USER WATCHDOG TIMER REGISTERS
OFFSET REGISTER NAME ACCESS OFFSET REGISTER NAME ACCESS
0x01C0 UWDT Quiet Time R/W
0x01C4 UWDT Window R/W
0x01C8 UWDT Strobe R/W
STATUS REGISTERS
*When an event is detected, the bit associated with the event is set in this register and will remain set until the user clears the event bit. Clearing the bit requires writing a 1 back to the specific bit that was set when read (i.e., write-1-to-clear, writing a “1” to a bit set to “1” will set the bit to “0”).
OFFSET REGISTER NAME ACCESS OFFSET REGISTER NAME ACCESS
0x09B0 Dynamic Status R
0x09B4 Latched Status* R/W
0x09B8 Interrupt Enable R/W
0x09BC Set Edge/Level Interrupt R/W
INTERRUPT REGISTERS
The Interrupt Vector and Interrupt Steering registers are mapped to the Motherboard Memory Space and these addresses are absolute based on the module slot position. In other words, do not apply the Module Address offset to these addresses.
OFFSET REGISTER NAME ACCESS OFFSET REGISTER NAME ACCESS
0x056C Module 1 Interrupt Vector 28 - User Watchdog Timer Fault/Inter-FPGA Failure R/W 0x066C Module 1 Interrupt Steering 28 - User Watchdog Timer Fault/Inter-FPGA Failure R/W
0x076C Module 2 Interrupt Vector 28 - User Watchdog Timer Fault/Inter-FPGA Failure R/W 0x086C Module 2 Interrupt Steering 28 - User Watchdog Timer Fault/Inter-FPGA Failure R/W
0x096C Module 3 Interrupt Vector 28 - User Watchdog Timer Fault/Inter-FPGA Failure R/W 0x0A6C Module 3 Interrupt Steering 28 - User Watchdog Timer Fault/Inter-FPGA Failure R/W
0x0B6C Module 4 Interrupt Vector 28 - User Watchdog Timer Fault/Inter-FPGA Failure R/W 0x0C6C Module 4 Interrupt Steering 28 - User Watchdog Timer Fault/Inter-FPGA Failure R/W
0x0D6C Module 5 Interrupt Vector 28 - User Watchdog Timer Fault/Inter-FPGA Failure R/W 0x0E6C Module 5 Interrupt Steering 28 - User Watchdog Timer Fault/Inter-FPGA Failure R/W
0x0F6C Module 6 Interrupt Vector 28 - User Watchdog Timer Fault/Inter-FPGA Failure R/W 0x106C Module 6 Interrupt Steering 28 - User Watchdog Timer Fault/Inter-FPGA Failure R/W

REVISION HISTORY

Motherboard Manual - Status and Interrupts Revision History
Revision Revision Date Description
C 2021-11-30 C08896; Transition manual to docbuilder format - no technical info change.

DOCS.NAII REVISIONS

Revision Date Description
2026-03-02 Formatting updates to document; no technical changes.
Link to original

MODULE COMMON REGISTERS

The registers described in this document are common to all NAI Generation 5 modules.

Module Information Registers

The registers in this section provide module information such as firmware revisions, capabilities and unique serial number information.

FPGA Version Registers

The FPGA firmware version registers include registers that contain the Revision, Compile Timestamp, SerDes Revision, Template Revision and Zynq Block Revision information.

FPGA Revision
Function: FPGA firmware revision
Type: unsigned binary word (32-bit)
Data Range: 0x0000 0000 to 0xFFFF FFFF
Read/Write: R
Initialized Value: Value corresponding to the revision of the board's FPGA
Operational Settings: The upper 16-bits are the major revision and the lower 16-bits are the minor revision.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Major Revision Number
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Minor Revision Number

FPGA Compile Timestamp
Function: Compile Timestamp for the FPGA firmware.
Type: unsigned binary word (32-bit)
Data Range: N/A
Read/Write: R
Initialized Value: Value corresponding to the compile timestamp of the board's FPGA
Operational Settings: The 32-bit value represents the Day, Month, Year, Hour, Minutes and Seconds as formatted in the table:

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
day (5-bits) month (4-bits) year (6-bits) hr
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
hour (5-bits) minutes (6-bits) seconds (6-bits)

FPGA SerDes Revision
Function: FPGA SerDes revision
Type: unsigned binary word (32-bit)
Data Range: 0x0000 0000 to 0xFFFF FFFF
Read/Write: R
Initialized Value: Value corresponding to the SerDes revision of the board's FPGA
Operational Settings: The upper 16-bits are the major revision, and the lower 16-bits are the minor revision.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Major Revision Number
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Minor Revision Number

FPGA Template Revision
Function: FPGA Template revision
Type: unsigned binary word (32-bit)
Data Range: 0x0000 0000 to 0xFFFF FFFF
Read/Write: R
Initialized Value: Value corresponding to the template revision of the board's FPGA
Operational Settings: The upper 16-bits are the major revision, and the lower 16-bits are the minor revision.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Major Revision Number
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Minor Revision Number

FPGA Zynq Block Revision
Function: FPGA Zynq Block revision
Type: unsigned binary word (32-bit)
Data Range: 0x0000 0000 to 0xFFFF FFFF
Read/Write: R
Initialized Value: Value corresponding to the Zynq block revision of the board's FPGA
Operational Settings: The upper 16-bits are the major revision, and the lower 16-bits are the minor revision.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Major Revision Number
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Minor Revision Number

Bare Metal Version Registers

The Bare Metal firmware version registers include registers that contain the Revision and Compile Time information.

Bare Metal Revision
Function: Bare Metal firmware revision
Type: unsigned binary word (32-bit)
Data Range: 0x0000 0000 to 0xFFFF FFFF
Read/Write: R
Initialized Value: Value corresponding to the revision of the board's Bare Metal
Operational Settings: The upper 16-bits are the major revision and the lower 16-bits are the minor revision.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Major Revision Number
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Minor Revision Number

Bare Metal Compile Time
Function: Provides an ASCII representation of the Date/Time for the Bare Metal compile time.
Type: 24-character ASCII string - Six (6) unsigned binary word (32-bit)
Data Range: N/A
Read/Write: R
Initialized Value: Value corresponding to the ASCII representation of the compile time of the board's Bare Metal
Operational Settings: The six 32-bit words provide an ASCII representation of the Date/Time. The hexadecimal values in the field below represent: May 17 2019 at 15:38:32

Note

little-endian order of ASCII values

Word 1 (Ex. 0x2079614D)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Space (0x20) Month ('y' - 0x79)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Month ('a' - 0x61) Month ('M' - 0x4D)
Word 2 (Ex. 0x32203731)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Year ('2' - 0x32) Space (0x20)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Day ('7' - 0x37) Day ('1' - 0x31)
Word 3 (Ex. 0x20393130)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Space (0x20) Year ('9' - 0x39)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Year ('1' - 0x31) Year ('0' - 0x30)
Word 4 (Ex. 0x31207461)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Hour ('1' - 0x31) Space (0x20)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
'a' (0x74) 't' (0x61)
Word 5 (Ex. 0x38333A35)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Minute ('8' - 0x38) Minute ('3' - 0x33)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
':' (0x3A) Hour ('5' - 0x35)
Word 6 (Ex. 0x0032333A)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
NULL (0x00) Seconds ('2' - 0x32)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Seconds ('3' - 0x33) ':' (0x3A)

FSBL Version Registers

The FSBL version registers include registers that contain the Revision and Compile Time information for the First Stage Boot Loader (FSBL).

FSBL Revision
Function: FSBL firmware revision
Type: unsigned binary word (32-bit)
Data Range: 0x0000 0000 to 0xFFFF FFFF
Read/Write: R
Initialized Value: Value corresponding to the revision of the board's FSBL
Operational Settings: The upper 16-bits are the major revision, and the lower 16-bits are the minor revision.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Major Revision Number
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Minor Revision Number

FSBL Compile Time
Function: Provides an ASCII representation of the Date/Time for the FSBL compile time.
Type: 24-character ASCII string - Six (6) unsigned binary word (32-bit)
Data Range: N/A
Read/Write: R
Initialized Value: Value corresponding to the ASCII representation of the Compile Time of the board's FSBL
Operational Settings: The six 32-bit words provide an ASCII representation of the Date/Time.

The hexadecimal values in the field below represent: May 17 2019 at 15:38:32

Note

little-endian order of ASCII values

Word 1 (Ex. 0x2079614D)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Space (0x20) Month ('y' - 0x79)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Month ('a' - 0x61) Month ('M' - 0x4D)
Word 2 (Ex. 0x32203731)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Year ('2' - 0x32) Space (0x20)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Day ('7' - 0x37) Day ('1' - 0x31)
Word 3 (Ex. 0x20393130)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Space (0x20) Year ('9' - 0x39)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Year ('1' - 0x31) Year ('0' - 0x30)
Word 4 (Ex. 0x31207461)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Hour ('1' - 0x31) Space (0x20)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
'a' (0x74) 't' (0x61)
Word 5 (Ex. 0x38333A35)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Minute ('8' - 0x38) Minute ('3' - 0x33)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
':' (0x3A) Hour ('5' - 0x35)
Word 6 (Ex. 0x0032333A)
D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
NULL (0x00) Seconds ('2' - 0x32)
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Seconds ('3' - 0x33) ':' (0x3A)

Module Serial Number Registers

The Module Serial Number registers include registers that contain the Serial Numbers for the Interface Board and the Functional Board of the module.

Interface Board Serial Number
Function: Unique 128-bit identifier used to identify the interface board.
Type: 16-character ASCII string - Four (4) unsigned binary words (32-bit)
Data Range: N/A
Read/Write: R
Initialized Value: Serial number of the interface board
Operational Settings: This register is for information purposes only.

Functional Board Serial Number
Function: Unique 128-bit identifier used to identify the functional board.
Type: 16-character ASCII string - Four (4) unsigned binary words (32-bit)
Data Range: N/A
Read/Write: R
Initialized Value: Serial number of the functional board
Operational Settings: This register is for information purposes only.

Module Capability
Function: Provides indication for whether or not the module can support the following: SerDes block reads, SerDes FIFO block reads, SerDes packing (combining two 16-bit values into one 32-bit value) and floating point representation. The purpose for block access and packing is to improve the performance of accessing larger amounts of data over the SerDes interface.
Type: unsigned binary word (32-bit)
Data Range: 0x0000 0000 to 0x0000 0107
Read/Write: R
Initialized Value: 0x0000 0107
Operational Settings: A “1” in the bit associated with the capability indicates that it is supported.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 0 0 0 Flt-Pt 0 0 0 0 0 Pack FIFO Blk Blk

Module Memory Map Revision
Function: Module Memory Map revision
Type: unsigned binary word (32-bit)
Data Range: 0x0000 0000 to 0xFFFF FFFF
Read/Write: R
Initialized Value: Value corresponding to the Module Memory Map Revision
Operational Settings: The upper 16-bits are the major revision and the lower 16-bits are the minor revision.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Major Revision Number
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Minor Revision Number

Module Measurement Registers

The registers in this section provide module temperature measurement information.

Temperature Readings Registers

The temperature registers provide the current, maximum (from power-up) and minimum (from power-up) Zynq and PCB temperatures.

Interface Board Current Temperature
Function: Measured PCB and Zynq Core temperatures on Interface Board.
Type: signed byte (8-bits) for PCB and signed byte (8-bits) for Zynq core temperatures
Data Range: 0x0000 0000 to 0x0000 FFFF
Read/Write: R
Initialized Value: Value corresponding to the measured PCB and Zynq core temperatures based on the table below
Operational Settings: The upper 16-bits are not used, and the lower 16-bits are the PCB and Zynq Core Temperatures. For example, if the register contains the value 0x0000 202C, this represents PCB Temperature = 32° Celsius and Zynq Temperature = 44° Celsius.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
PCB Temperature Zynq Core Temperature

Functional Board Current Temperature
Function: Measured PCB temperature on Functional Board.
Type: signed byte (8-bits) for PCB
Data Range: 0x0000 0000 to 0x0000 00FF
Read/Write: R
Initialized Value: Value corresponding to the measured PCB on the table below
Operational Settings: The upper 24-bits are not used, and the lower 8-bits are the PCB Temperature. For example, if the register contains the value 0x0000 0019, this represents PCB Temperature = 25° Celsius.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 0 0 0 0 PCB Temperature

Interface Board Maximum Temperature
Function: Maximum PCB and Zynq Core temperatures on Interface Board since power-on.
Type: signed byte (8-bits) for PCB and signed byte (8-bits) for Zynq core temperatures
Data Range: 0x0000 0000 to 0x0000 FFFF
Read/Write: R
Initialized Value: Value corresponding to the maximum measured PCB and Zynq core temperatures since power-on based on the table below
Operational Settings: The upper 16-bits are not used, and the lower 16-bits are the maximum PCB and Zynq Core Temperatures. For example, if the register contains the value 0x0000 5569, this represents maximum PCB Temperature = 85° Celsius and maximum Zynq Temperature = 105° Celsius.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
PCB Temperature Zynq Core Temperature

Interface Board Minimum Temperature
Function: Minimum PCB and Zynq Core temperatures on Interface Board since power-on.
Type: signed byte (8-bits) for PCB and signed byte (8-bits) for Zynq core temperatures
Data Range: 0x0000 0000 to 0x0000 FFFF
Read/Write: R
Initialized Value: Value corresponding to the minimum measured PCB and Zynq core temperatures since power-on based on the table below
Operational Settings: The upper 16-bits are not used, and the lower 16-bits are the minimum PCB and Zynq Core Temperatures. For example, if the register contains the value 0x0000 D8E7, this represents minimum PCB Temperature = -40° Celsius and minimum Zynq Temperature = -25° Celsius.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
PCB Temperature Zynq Core Temperature

Functional Board Maximum Temperature
Function: Maximum PCB temperature on Functional Board since power-on.
Type: signed byte (8-bits) for PCB
Data Range: 0x0000 0000 to 0x0000 00FF
Read/Write: R
Initialized Value: Value corresponding to the measured PCB on the table below
Operational Settings: The upper 24-bits are not used, and the lower 8-bits are the PCB Temperature. For example, if the register contains the value 0x0000 0055, this represents PCB Temperature = 85° Celsius.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 0 0 0 0 PCB Temperature

Functional Board Minimum Temperature
Function: Minimum PCB temperature on Functional Board since power-on.
Type: signed byte (8-bits) for PCB
Data Range: 0x0000 0000 to 0x0000 00FF
Read/Write: R
Initialized Value: Value corresponding to the measured PCB on the table below
Operational Settings: The upper 24-bits are not used, and the lower 8-bits are the PCB Temperature. For example, if the register contains the value 0x0000 00D8, this represents PCB Temperature = -40° Celsius.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
0 0 0 0 0 0 0 0 PCB Temperature

Higher Precision Temperature Readings Registers

These registers provide higher precision readings of the current Zynq and PCB temperatures.

Higher Precision Zynq Core Temperature
Function: Higher precision measured Zynq Core temperature on Interface Board.
Type: signed word (16-bits) for integer part and unsigned word (16-bits) for fractional part
Data Range: 0x0000 0000 to 0xFFFF FFFF
Read/Write: R
Initialized Value: Measured Zynq Core temperature on Interface Board
Operational Settings: The upper 16-bits represent the signed integer part of the temperature and the lower 16-bits represent the fractional part of the temperature with the resolution of 1/1000 of degree Celsius. For example, if the register contains the value 0x002B 0271, this represents Zynq Core Temperature = 43.625° Celsius, and value 0xFFF6 0177 represents -10.375° Celsius.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Signed Integer Part of Temperature
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Fractional Part of Temperature

Higher Precision Interface PCB Temperature
Function: Higher precision measured Interface PCB temperature.
Type: signed word (16-bits) for integer part and unsigned word (16-bits) for fractional part
Data Range: 0x0000 0000 to 0xFFFF FFFF
Read/Write: R
Initialized Value: Measured Interface PCB temperature
Operational Settings: The upper 16-bits represent the signed integer part of the temperature and the lower 16-bits represent the fractional part of the temperature with the resolution of 1/1000 of degree Celsius. For example, if the register contains the value 0x0020 007D, this represents Interface PCB Temperature = 32.125° Celsius, and value 0xFFE8 036B represents -24.875° Celsius.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Signed Integer Part of Temperature
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Fractional Part of Temperature

Higher Precision Functional PCB Temperature
Function: Higher precision measured Functional PCB temperature.
Type: signed word (16-bits) for integer part and unsigned word (16-bits) for fractional part
Data Range: 0x0000 0000 to 0xFFFF FFFF
Read/Write: R
Initialized Value: Measured Functional PCB temperature
Operational Settings: The upper 16-bits represent the signed integer part of the temperature and the lower 16-bits represent the fractional part of the temperature with the resolution of 1/100 of degree Celsius. For example, if the register contains the value 0x0018 004B, this represents Functional PCB Temperature = 24.75° Celsius, and value 0xFFD9 0019 represents -39.25° Celsius.

D31 D30 D29 D28 D27 D26 D25 D24 D23 D22 D21 D20 D19 D18 D17 D16
Signed Integer Part of Temperature
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
Fractional Part of Temperature

Module Health Monitoring Registers

The registers in this section provide module temperature measurement information. If the temperature measurements reaches the Lower Critical or Upper Critical conditions, the module will automatically reset itself to prevent damage to the hardware.

Module Sensor Summary Status
Function: The corresponding sensor bit is set if the sensor has crossed any of its thresholds.
Type: unsigned binary word (32-bits)
Data Range: See table below
Read/Write: R
Initialized Value: 0
Operational Settings: This register provides a summary for module sensors. When the corresponding sensor bit is set, the Sensor Threshold Status register for that sensor will indicate the threshold condition that triggered the event.

Bit(s) Sensor
D31:D6 Reserved
D5 Functional Board PCB Temperature
D4 Interface Board PCB Temperature
D3:D0 Reserved

Module Sensor Registers

The registers listed in this section apply to each module sensor listed for the Module Sensor Summary Status register. Each individual sensor register provides a group of registers for monitoring module temperatures readings. From these registers, a user can read the current temperature of the sensor in addition to the minimum and maximum temperature readings since power-up. Upper and lower critical/warning temperature thresholds can be set and monitored from these registers. When a programmed temperature threshold is crossed, the Sensor Threshold Status register will set the corresponding bit for that threshold. The figure below shows the functionality of this group of registers when accessing the Interface Board PCB Temperature sensor as an example.

Sensor Threshold Status
Function: Reflects which threshold has been crossed
Type: unsigned binary word (32-bits)
Data Range: See table below
Read/Write: R
Initialized Value: 0
Operational Settings: The associated bit is set when the sensor reading exceed the corresponding threshold settings.

Bit(s) Description
D31:D4 Reserved
D3 Exceeded Upper Critical Threshold
D2 Exceeded Upper Warning Threshold
D1 Exceeded Lower Critical Threshold
D0 Exceeded Lower Warning Threshold

Sensor Current Reading
Function: Reflects current reading of temperature sensor
Type: Single Precision Floating Point Value (IEEE-754)
Data Range: Single Precision Floating Point Value (IEEE-754)
Read/Write: R
Initialized Value: N/A
Operational Settings: The register represents current sensor reading as a single precision floating point value. For example, for a temperature sensor, register value 0x41C6 0000 represents temperature = 24.75° Celsius.

Sensor Minimum Reading
Function: Reflects minimum value of temperature sensor since power up
Type: Single Precision Floating Point Value (IEEE-754)
Data Range: Single Precision Floating Point Value (IEEE-754)
Read/Write: R
Initialized Value: N/A
Operational Settings: The register represents minimum sensor value as a single precision floating point value. For example, for a temperature sensor, register value 0x41C6 0000 represents temperature = 24.75° Celsius.

Sensor Maximum Reading
Function: Reflects maximum value of temperature sensor since power up
Type: Single Precision Floating Point Value (IEEE-754)
Data Range: Single Precision Floating Point Value (IEEE-754)
Read/Write: R
Initialized Value: N/A
Operational Settings: The register represents maximum sensor value as a single precision floating point value. For example, for a temperature sensor, register value 0x41C6 0000 represents temperature = 24.75° Celsius.

Sensor Lower Warning Threshold
Function: Reflects lower warning threshold of temperature sensor
Type: Single Precision Floating Point Value (IEEE-754)
Data Range: Single Precision Floating Point Value (IEEE-754)
Read/Write: R/W
Initialized Value: Default lower warning threshold (value dependent on specific sensor)
Operational Settings: The register represents sensor lower warning threshold as a single precision floating point value. For example, for a temperature sensor, register value 0xC220 0000 represents temperature = -40.0° Celsius.

Sensor Lower Critical Threshold
Function: Reflects lower critical threshold of temperature sensor
Type: Single Precision Floating Point Value (IEEE-754)
Data Range: Single Precision Floating Point Value (IEEE-754)
Read/Write: R/W
Initialized Value: Default lower critical threshold (value dependent on specific sensor)
Operational Settings: The register represents sensor lower critical threshold as a single precision floating point value. For example, for a temperature sensor, register value 0xC25C 0000 represents temperature = -55.0° Celsius.

Sensor Upper Warning Threshold
Function: Reflects upper warning threshold of temperature sensor
Type: Single Precision Floating Point Value (IEEE-754)
Data Range: Single Precision Floating Point Value (IEEE-754)
Read/Write: R/W
Initialized Value: Default upper warning threshold (value dependent on specific sensor)
Operational Settings: The register represents sensor upper warning threshold as a single precision floating point value. For example, for a temperature sensor, register value 0x42AA 0000 represents temperature = 85.0° Celsius.

Sensor Upper Critical Threshold
Function: Reflects upper critical threshold of temperature sensor
Type: Single Precision Floating Point Value (IEEE-754)
Data Range: Single Precision Floating Point Value (IEEE-754)
Read/Write: R/W
Initialized Value: Default upper critical threshold (value dependent on specific sensor)
Operational Settings: The register represents sensor upper critical threshold as a single precision floating point value. For example, for a temperature sensor, register value 0x42FA 0000 represents temperature = 125.0° Celsius.

FUNCTION REGISTER MAP

KEY

Configuration/Control
Measurement/Status/Board Information

MODULE INFORMATION REGISTERS
OFFSET REGISTER NAME ACCESS OFFSET REGISTER NAME ACCESS
0x003C FPGA Revision R 0x0074 Bare Metal Revision R
0x0030 FPGA Compile Timestamp R 0x0080 Bare Metal Compile Time (Bit 0-31) R
0x0034 FPGA SerDes Revision R 0x0084 Bare Metal Compile Time (Bit 32-63) R
0x0038 FPGA Template Revision R 0x0088 Bare Metal Compile Time (Bit 64-95) R
0x0040 FPGA Zynq Block Revision R 0x008C Bare Metal Compile Time (Bit 96-127) R
0x0090 Bare Metal Compile Time (Bit 128-159) R
0x0094 Bare Metal Compile Time (Bit 160-191) R
0x007C FSBL Revision R
0x00B0 FSBL Compile Time (Bit 0-31) R
0x00B4 FSBL Compile Time (Bit 32-63) R
0x00B8 FSBL Compile Time (Bit 64-95) R
0x00BC FSBL Compile Time (Bit 96-127) R
0x00C0 FSBL Compile Time (Bit 128-159) R
0x00C4 FSBL Compile Time (Bit 160-191) R
0x0000 Interface Board Serial Number (Bit 0-31) R 0x0010 Functional Board Serial Number (Bit 0-31) R
0x0034 Interface Board Serial Number (Bit 32-63) R 0x0014 Functional Board Serial Number (Bit 32-63) R
0x0008 Interface Board Serial Number (Bit 64-95) R 0x0018 Functional Board Serial Number (Bit 64-95) R
0x000C Interface Board Serial Number (Bit 96-127) R 0x001C Functional Board Serial Number (Bit 96-127) R
0x0070 Module Capability R
0x01FC Module Memory Map Revision R
MODULE MEASUREMENTS REGISTERS
OFFSET REGISTER NAME ACCESS OFFSET REGISTER NAME ACCESS
0x0200 Interface Board PCB/Zynq Current Temp R 0x0208 Functional Board PCB Current Temp R
0x0218 Interface Board PCB/Zynq Max Temp R 0x0228 Functional Board PCB Max Temp R
0x0220 Interface Board PCB/Zynq Min Temp R 0x0230 Functional Board PCB Min Temp R
0x02C0 Higher Precision Zynq Core Temperature R
0x02C4 Higher Precision Interface PCB Temperature R
0x02E0 Higher Precision Functional PCB Temperature R
MODULE HEALTH MONITORING REGISTERS
OFFSET REGISTER NAME ACCESS OFFSET REGISTER NAME ACCESS
0x07F8 Module Sensor Summary Status R
![](/_shared/images/Module_Sensor_Registers_Memory_Map.png)

REVISION HISTORY

Motherboard Manual - Module Common Registers Revision History
Revision Revision Date Description
C 2023-08-11 ECO C10649, initial release of module common registers manual.
C1 2024-05-15 ECO C11522, removed Zynq Core/Aux/DDR Voltage register descriptions from Module Measurement Registers. Pg.16, updated Module Sensor Summary Status register to add PS references; updated Bit Table to change voltage/current bits to 'reserved'. Pg.16, updated Module/Power Supply Sensor Registers description to better describe register functionality and to add figure. Pg.17, added 'Exceeded' to threshold bit descriptions. Pg.17-18, removed voltage/current references from sensor descriptions. Pg.20, removed Zynq Core/Aux/DDR Voltage register offsets from Module Measurement Registers. Pg.20, updated Module Health Monitoring Registers offset tables.
C2 2024-07-10 ECO C11701, pg.16, updated Module Sensor Summary Status register to remove PS references;updated Bit Table to change PS temperature bits to 'reserved'. Pg.16, updated Module SensorRegisters description to remove PS references. Pg.20, updated Module Health MonitoringRegisters offset tables to remove PS temperature register offsets.

DOCS.NAII REVISIONS

Revision Date Description
2025-11-05 Corrected register offsets for Interface Board Min Temp and Function Board Min & Max Temps.
2026-03-02 Formatting updates to document; no technical changes.
Link to original

Revision History

Module Manual - Status and Interrupts Revision History
Revision	Revision Date	Description
C	2021-11-30	C08896; Transition manual to docbuilder format - no technical info change.

Module Manual - User Watchdog Timer Revision History
Revision	Revision Date	Description
C	2021-11-30	C08896; Transition manual to docbuilder format - no technical info change.

Module Manual - Module Common Registers Revision History
Revision	Revision Date	Description
C	2023-08-11	ECO C10649, initial release of module common registers manual.

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Link to original

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NAI Documentation

Explorer

DT1 DATA SHEET

INTRODUCTION

DT1 Overview

PRINCIPLE OF OPERATION

Input/Output Interface

Output

Input

Input/Output Circuits

Discrete Input/Output Voltage Threshold Programming

Debounce Programming

Automatic Background Built-In Test (BIT)/Diagnostic Capability

Status and Interrupts

Module Common Registers

Unit Conversions

User Watchdog Timer Capability

REGISTER DESCRIPTIONS

Discrete Input/Output Registers

I/O Format Ch1-16

I/O Format Ch1-16

I/O Format Ch17-24

I/O Format Ch17-24

Write Outputs

Write Outputs

Input/Output State

Input/Output State

Discrete Input/Output Voltage Threshold Programming Registers

Voltage Threshold Levels (Integer Mode)

Voltage Threshold Levels (Floating Point Mode)

Max High Voltage Threshold

Upper Voltage Threshold

Lower Voltage Threshold

Min Low Voltage Threshold

Discrete Input/Output Measurement Registers

Voltage Reading

Voltage Reading (Enable Floating Point Mode: Integer Mode)

Voltage Reading (Enable Floating Point Mode: Floating Point Mode)

Current Reading

Current Reading (Enable Floating Point Mode: Integer Mode)

Current Reading (Enable Floating Point Mode: Floating Point Mode)

VCC Bank Registers

Select Pull-Up or Pull-Down

Select Pull-Up or Pull-Down

Pull-Up/Down Current

Pull-Up/Down Current (Enable Floating Point Mode: Integer Mode)

Pull-Up/Down Current (Enable Floating Point Mode: Floating Point Mode)

VCC Voltage Reading

VCC Voltage Reading (Enable Floating Point Mode: Integer Mode)

VCC Voltage Reading (Enable Floating Point Mode: Floating Point Mode)

Discrete Input/Output Control Registers

Debounce Time

Overcurrent Reset

Overcurrent Reset

Unit Conversion Programming Registers

Enable Floating Point Mode

Enable Floating Point Mode

Floating Point State

Floating Point State

Background BIT Threshold Programming Registers

Background BIT Threshold

BIT Count Clear

BIT Count Clear

User Watchdog Timer Programming Registers

Module Common Registers

Status and Interrupt Registers

Channel Status Enable

Channel Status Enable

BIT Status

BIT Status

Voltage Reading Error

Voltage Reading Error

Driver Error

Driver Error

Low-to-High Transition Status

Low-to-High Transition Status

High-to-Low Transition Status

High-to-Low Transition Status

Overcurrent Status

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