SPRSP74D october   2022  – july 2023 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
    1. 3.1 Functional Block Diagram
  5. 4 Revision History
  6. 5 Device Comparison
    1. 5.1 Related Products
  7. 6 Terminal Configuration and Functions
    1. 6.1 Pin Diagram
      1. 6.1.1 ZCZ Pin Diagram
    2. 6.2 Pin Attributes
      1.      13
      2.      14
    3. 6.3 Signal Descriptions
      1.      16
      2. 6.3.1  ADC
        1.       18
        2.       19
        3.       20
        4.       21
        5.       22
        6. 6.3.1.1 ADC-CMPSS Signal Connections
      3. 6.3.2  ADC_CAL
        1.       25
      4. 6.3.3  ADC VREF
        1.       27
      5. 6.3.4  CPSW
        1.       29
        2.       30
        3.       31
        4.       32
        5.       33
        6.       34
        7.       35
      6. 6.3.5  CPTS
        1.       37
      7. 6.3.6  DAC
        1.       39
      8. 6.3.7  Emulation and Debug
        1.       41
        2.       42
      9. 6.3.8  EPWM
        1.       44
        2.       45
        3.       46
        4.       47
        5.       48
        6.       49
        7.       50
        8.       51
        9.       52
        10.       53
        11.       54
        12.       55
        13.       56
        14.       57
        15.       58
        16.       59
        17.       60
        18.       61
        19.       62
        20.       63
        21.       64
        22.       65
        23.       66
        24.       67
        25.       68
        26.       69
        27.       70
        28.       71
        29.       72
        30.       73
        31.       74
        32.       75
      10. 6.3.9  EQEP
        1.       77
        2.       78
        3.       79
      11. 6.3.10 FSI
        1.       81
        2.       82
        3.       83
        4.       84
        5.       85
        6.       86
        7.       87
        8.       88
      12. 6.3.11 GPIO
        1.       90
      13. 6.3.12 GPMC
        1.       92
      14. 6.3.13 I2C
        1.       94
        2.       95
        3.       96
        4.       97
        5.       98
      15. 6.3.14 LIN
        1.       100
        2.       101
        3.       102
        4.       103
        5.       104
      16. 6.3.15 MCAN
        1.       106
        2.       107
        3.       108
        4.       109
      17. 6.3.16 SPI (MCSPI)
        1.       111
        2.       112
        3.       113
        4.       114
        5.       115
      18. 6.3.17 MMC
        1.       117
      19. 6.3.18 Power Supply
        1.       119
      20. 6.3.19 PRU-ICSS
        1.       121
        2.       122
        3.       123
        4.       124
        5.       125
      21. 6.3.20 QSPI
        1.       127
      22. 6.3.21 Reserved
        1.       129
      23. 6.3.22 SDFM
        1.       131
        2.       132
      24. 6.3.23 System and Miscellaneous
        1. 6.3.23.1 Boot Mode Configuration
          1.        135
        2. 6.3.23.2 Clocking
          1.        137
          2.        138
          3.        139
        3. 6.3.23.3 SYSTEM
          1.        141
        4. 6.3.23.4 VMON
          1.        143
      25. 6.3.24 UART
        1.       145
        2.       146
        3.       147
        4.       148
        5.       149
        6.       150
      26. 6.3.25 XBAR
        1.       152
    4. 6.4 Pin Connectivity Requirements
  8. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  Electrostatic Discharge (ESD) Extended Automotive Ratings
    3. 7.3  Electrostatic Discharge (ESD) Industrial Ratings
    4. 7.4  Power-On Hours (POH) Summary
      1. 7.4.1 Automotive Temperature Profile
    5. 7.5  Recommended Operating Conditions
    6. 7.6  Operating Performance Points
    7. 7.7  Power Consumption Summary
      1. 7.7.1 Power Consumption - Maximum
      2. 7.7.2 Power Consumption - Typical
      3. 7.7.3 Power Consumption - Traction Inverter
    8. 7.8  Electrical Characteristics
      1. 7.8.1 Digital and Analog IO Electrical Characteristics
      2. 7.8.2 Analog-to-Digital Converter (ADC)
      3. 7.8.3 Comparator Subsystem A (CMPSSA)
      4. 7.8.4 Comparator Subsystem B (CMPSSB)
      5. 7.8.5 Digital-to-Analog Converter (DAC)
      6. 7.8.6 Power Management Unit (PMU)
      7. 7.8.7 Safety Comparators
    9. 7.9  VPP Specifications for One-Time Programmable (OTP) eFuses
      1. 7.9.1 VPP Specifications
      2. 7.9.2 Hardware Requirements
      3. 7.9.3 Programming Sequence
      4. 7.9.4 Impact to Your Hardware Warranty
    10. 7.10 Thermal Resistance Characteristics
      1. 7.10.1 Package Thermal Characteristics
    11. 7.11 Timing and Switching Characteristics
      1. 7.11.1 Timing Parameters and Information
      2. 7.11.2 Power Supply Sequencing
        1. 7.11.2.1 Power-On and Reset Sequencing
          1. 7.11.2.1.1 Power Reset Sequence Description
        2. 7.11.2.2 Power-Down Sequencing
      3. 7.11.3 System Timing
        1. 7.11.3.1 System Timing Conditions
        2. 7.11.3.2 Reset Timing
          1. 7.11.3.2.1 PORz Timing Requirements
          2.        191
          3. 7.11.3.2.2 WARMRSTn Switching Characteristics
          4.        193
          5. 7.11.3.2.3 WARMRSTn Timing Requirements
          6.        195
        3. 7.11.3.3 Safety Signal Timing
          1. 7.11.3.3.1 SAFETY_ERRORn Switching Characteristics
          2.        198
      4. 7.11.4 Clock Specifications
        1. 7.11.4.1 Input Clocks / Oscillators
          1. 7.11.4.1.1 Crystal Oscillator (XTAL) Parameters
          2. 7.11.4.1.2 External Clock Characteristics
        2. 7.11.4.2 Clock Timing
          1. 7.11.4.2.1 Clock Timing Requirements
          2.        205
          3. 7.11.4.2.2 Clock Switching Characteristics
          4.        207
      5. 7.11.5 Peripherals
        1. 7.11.5.1  2-port Gigabit Ethernet MAC (CPSW)
          1. 7.11.5.1.1 CPSW MDIO Timing
            1. 7.11.5.1.1.1 CPSW MDIO Timing Conditions
            2. 7.11.5.1.1.2 CPSW MDIO Timing Requirements
            3. 7.11.5.1.1.3 CPSW MDIO Switching Characteristics
            4.         214
          2. 7.11.5.1.2 CPSW RMII Timing
            1. 7.11.5.1.2.1 CPSW RMII Timing Conditions
            2. 7.11.5.1.2.2 CPSW RMII[x]_REFCLK Timing Requirements - RMII Mode
            3.         218
            4. 7.11.5.1.2.3 CPSW RMII[x]_RXD[1:0], RMII[x]_CRS_DV, and RMII[x]_RXER Timing Requirements - RMII Mode
            5.         220
            6. 7.11.5.1.2.4 CPSW RMII[x]_TXD[1:0], and RMII[x]_TXEN Switching Characteristics - RMII Mode
            7.         222
          3. 7.11.5.1.3 CPSW RGMII Timing
            1. 7.11.5.1.3.1 CPSW RGMII Timing Conditions
            2. 7.11.5.1.3.2 CPSW RGMII[x]_RCLK Timing Requirements - RGMII Mode
            3. 7.11.5.1.3.3 CPSW RGMII[x]_RD[3:0], and RGMII[x]_RCTL Timing Requirements
            4.         227
            5. 7.11.5.1.3.4 CPSW RGMII[x]_TCLK Switching Characteristics - RGMII Mode
            6. 7.11.5.1.3.5 CPSW RGMII[x]_TD[3:0], and RGMII[x]_TCTL Switching Characteristics - RGMII Mode
            7.         230
        2. 7.11.5.2  Enhanced Capture (eCAP)
          1. 7.11.5.2.1 ECAP Timing Conditions
          2. 7.11.5.2.2 ECAP Timing Requirements
          3.        234
          4. 7.11.5.2.3 ECAP Switching Characteristics
          5.        236
        3. 7.11.5.3  Enhanced Pulse Width Modulation (ePWM)
          1. 7.11.5.3.1 EPWM Timing Conditions
          2. 7.11.5.3.2 EPWM Timing Requirements
          3.        240
          4. 7.11.5.3.3 EPWM Switching Characteristics
          5.        242
          6.        EPWM Characteristics
        4. 7.11.5.4  Enhanced Quadrature Encoder Pulse (eQEP)
          1. 7.11.5.4.1 EQEP Timing Conditions
          2. 7.11.5.4.2 EQEP Timing Requirements
          3.        247
          4. 7.11.5.4.3 EQEP Switching Characteristics
        5. 7.11.5.5  Fast Serial Interface (FSI)
          1. 7.11.5.5.1 FSI Timing Conditions
          2. 7.11.5.5.2 FSIRX Timing Requirements
          3.        252
          4. 7.11.5.5.3 FSIRX Switching Characteristics
          5. 7.11.5.5.4 FSITX Switching Characteristics
          6.        255
          7. 7.11.5.5.5 FSITX SPI Signaling Mode Switching Characteristics
          8.        257
        6. 7.11.5.6  General Purpose Input/Output (GPIO)
          1. 7.11.5.6.1 GPIO Timing Conditions
          2. 7.11.5.6.2 GPIO Timing Requirements
          3. 7.11.5.6.3 GPIO Switching Characteristics
        7. 7.11.5.7  General Purpose Memory Controller (GPMC)
          1. 7.11.5.7.1 GPMC Timing Conditions
          2. 7.11.5.7.2 GPMC/NOR Flash Timing Requirements - Synchronous Mode 100MHz
          3. 7.11.5.7.3 GPMC/NOR Flash Switching Characteristics - Synchronous Mode 100MHz
          4.        266
          5. 7.11.5.7.4 GPMC/NOR Flash Timing Requirements - Asynchronous Mode 100MHz
          6. 7.11.5.7.5 GPMC/NOR Flash Switching Characteristics - Asynchronous Mode 100MHz
          7.        269
          8. 7.11.5.7.6 GPMC/NAND Flash Timing Requirements - Asynchronous Mode 100MHz
          9. 7.11.5.7.7 GPMC/NAND Flash Switching Characteristics - Asynchronous Mode 100MHz
          10.        272
        8. 7.11.5.8  Inter-Integrated Circuit (I2C)
          1. 7.11.5.8.1 I2C
        9. 7.11.5.9  Local Interconnect Network (LIN)
          1. 7.11.5.9.1 LIN Timing Conditions
          2. 7.11.5.9.2 LIN Timing Requirements
          3. 7.11.5.9.3 LIN Switching Characteristics
        10. 7.11.5.10 Modular Controller Area Network (MCAN)
          1. 7.11.5.10.1 MCAN Timing Conditions
          2. 7.11.5.10.2 MCAN Switching Characteristics
        11. 7.11.5.11 Serial Peripheral Interface (SPI)
          1. 7.11.5.11.1 SPI Timing Conditions
          2. 7.11.5.11.2 SPI Controller Mode Timing Requirements
          3.        285
          4. 7.11.5.11.3 SPI Controller Mode Switching Characteristics (Clock Phase = 0)
          5.        287
          6. 7.11.5.11.4 SPI Peripheral Mode Timing Requirements
          7.        289
          8. 7.11.5.11.5 SPI Peripheral Mode Switching Characteristics
          9.        291
        12. 7.11.5.12 Multi-Media Card/Secure Digital (MMCSD)
          1. 7.11.5.12.1 MMC Timing Conditions
          2. 7.11.5.12.2 MMC Timing Requirements - SD Card Default Speed Mode
          3.        295
          4. 7.11.5.12.3 MMC Switching Characteristics - SD Card Default Speed Mode
          5.        297
          6. 7.11.5.12.4 MMC Timing Requirements - SD Card High Speed Mode
          7.        299
          8. 7.11.5.12.5 MMC Switching Characteristics - SD Card High Speed Mode
          9.        301
        13. 7.11.5.13 Quad Serial Peripheral Interface (QSPI)
          1. 7.11.5.13.1 QSPI Timing Conditions
          2. 7.11.5.13.2 QSPI Timing Requirements
          3.        305
          4. 7.11.5.13.3 QSPI Switching Characteristics
          5.        307
        14. 7.11.5.14 Programmable Real-Time Unit and Industrial Communication Subsystem (PRU-ICSS)
          1. 7.11.5.14.1 PRU-ICSS Programmable Real-Time Unit (PRU)
            1. 7.11.5.14.1.1 PRU-ICSS PRU Timing Conditions
            2. 7.11.5.14.1.2 PRU-ICSS PRU Switching Characteristics - Direct Output Mode
            3.         312
            4. 7.11.5.14.1.3 PRU-ICSS PRU Timing Requirements - Parallel Capture Mode
            5.         314
            6. 7.11.5.14.1.4 PRU-ICSS PRU Timing Requirements - Shift In Mode
            7.         316
            8. 7.11.5.14.1.5 PRU-ICSS PRU Switching Characteristics - Shift Out Mode
            9.         318
          2. 7.11.5.14.2 PRU-ICSS PRU Sigma Delta and Peripheral Interface
            1. 7.11.5.14.2.1 PRU-ICSS PRU Sigma Delta and Peripheral Interface Timing Conditions
            2. 7.11.5.14.2.2 PRU-ICSS PRU Timing Requirements - Sigma Delta Mode
            3.         322
            4. 7.11.5.14.2.3 PRU-ICSS PRU Timing Requirements - Peripheral Interface Mode
            5.         324
            6. 7.11.5.14.2.4 PRU-ICSS PRU Switching Characteristics - Peripheral Interface Mode
            7.         326
          3. 7.11.5.14.3 PRU-ICSS Pulse Width Modulation (PWM)
            1. 7.11.5.14.3.1 PRU-ICSS PWM Timing Conditions
            2. 7.11.5.14.3.2 PRU-ICSS PWM Switching Characteristics
            3.         330
          4. 7.11.5.14.4 PRU-ICSS Industrial Ethernet Peripheral (IEP)
            1. 7.11.5.14.4.1 PRU-ICSS IEP Timing Conditions
            2. 7.11.5.14.4.2 PRU-ICSS IEP Timing Requirements - Input Validated with SYNCx
            3.         334
            4. 7.11.5.14.4.3 PRU-ICSS IEP Timing Requirements - Digital IOs
            5.         336
            6. 7.11.5.14.4.4 PRU-ICSS IEP Timing Requirements - LATCHx_IN
            7.         338
          5. 7.11.5.14.5 PRU-ICSS Universal Asynchronous Receiver Transmitter (UART)
            1. 7.11.5.14.5.1 PRU-ICSS UART Timing Conditions
            2. 7.11.5.14.5.2 PRU-ICSS UART Timing Requirements
            3. 7.11.5.14.5.3 PRU-ICSS UART Switching Characteristics
            4.         343
          6. 7.11.5.14.6 PRU-ICSS Enhanced Capture Peripheral (ECAP)
            1. 7.11.5.14.6.1 PRU-ICSS ECAP Timing Conditions
            2. 7.11.5.14.6.2 PRU-ICSS ECAP Timing Requirements
            3.         347
            4. 7.11.5.14.6.3 PRU-ICSS ECAP Switching Characteristics
            5.         349
          7. 7.11.5.14.7 PRU-ICSS MDIO and MII
            1. 7.11.5.14.7.1 PRU-ICSS MDIO Timing
              1. 7.11.5.14.7.1.1 PRU-ICSS MDIO Timing Conditions
              2. 7.11.5.14.7.1.2 PRU-ICSS MDIO Timing Requirements
              3. 7.11.5.14.7.1.3 PRU-ICSS MDIO Switching Characteristics
              4.          355
            2. 7.11.5.14.7.2 PRU-ICSS MII Timing
              1. 7.11.5.14.7.2.1 PRU-ICSS MII Timing Conditions
              2. 7.11.5.14.7.2.2 PRU-ICSS MII Timing Requirements - MII[x]_RX_CLK
              3.          359
              4. 7.11.5.14.7.2.3 PRU-ICSS MII Timing Requirements - MII[x]_RXD[3:0], MII[x]_RX_DV, and MII[x]_RX_ER
              5.          361
              6. 7.11.5.14.7.2.4 PRU-ICSS MII Switching Characteristics - MII[x]_TX_CLK
              7.          363
              8. 7.11.5.14.7.2.5 PRU-ICSS MII Switching Characteristics - MII[x]_TXD[3:0] and MII[x]_TXEN
              9.          365
        15. 7.11.5.15 Sigma Delta Filter Module (SDFM)
          1. 7.11.5.15.1 SDFM Timing Conditions
          2. 7.11.5.15.2 SDFM Switching Characteristics
        16. 7.11.5.16 Universal Asynchronous Receiver/Transmitter (UART)
          1. 7.11.5.16.1 UART Timing Conditions
          2. 7.11.5.16.2 UART Timing Requirements
          3. 7.11.5.16.3 UART Switching Characteristics
          4.        373
      6. 7.11.6 Emulation and Debug
        1. 7.11.6.1 JTAG
          1. 7.11.6.1.1 JTAG Timing Conditions
          2. 7.11.6.1.2 JTAG Timing Requirements
          3. 7.11.6.1.3 JTAG Switching Characteristics
          4.        379
        2. 7.11.6.2 Trace
          1. 7.11.6.2.1 Debug Trace Timing Conditions
          2. 7.11.6.2.2 Debug Trace Switching Characteristics
          3.        383
    12. 7.12 Decoupling Capacitor Requirements
      1. 7.12.1 Decoupling Capacitor Requirements
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Processor Subsystems
      1. 8.2.1 Arm Cortex-R5F Subsystem
  10. 9 Applications, Implementation, and Layout
    1. 9.1 Device Connection and Layout Fundamentals
      1. 9.1.1 External Oscillator
      2. 9.1.2 JTAG, EMU, and TRACE
      3. 9.1.3 Hardware Design Guide
  11. 10Device and Documentation Support
    1. 10.1 Device Nomenclature
      1. 10.1.1 Standard Package Symbolization
      2. 10.1.2 Device Naming Convention
    2. 10.2 Tools and Software
    3. 10.3 Documentation Support
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • ZCZ|324
Thermal pad, mechanical data (Package|Pins)
Orderable Information

The following list describes the contents of each column in the Pin Attributes table:

  1. Ball Number: Ball numbers assigned to each terminal of the Ball Grid Array package.
  2. Ball Name: Ball name assigned to each terminal of the Ball Grid Array package (this name is typically taken from the primary MUXMODE 0 signal function).
  3. Signal Name: Signal name of all dedicated and pin multiplexed signal functions associated with a ball.
    Note:

    The Pin Attributes table, defines the SoC pin multiplexed signal function implemented at the pin and does not define secondary multiplexing of signal functions implemented in device subsystems. Secondary multiplexing of signal functions are not described in this table. For more information on secondary multiplexed signal functions, see the respective peripheral chapter of the device TRM.

  4. Mux Mode: The MUXMODE value associated with each pin multiplexed signal function:
    • MUXMODE 0 is the primary pin multiplexed signal function. However, the primary pin multiplexed signal function is not necessarily the default pin multiplexed signal function.
    • MUXMODE values 1 through 15 are possible for pin multiplexed signal functions. However, not all MUXMODE values have been implemented. The only valid MUXMODE values are those defined as pin multiplexed signal functions within the Pin Attributes table. Only defined valid values of MUXMODE can be used.
    • Bootstrap defines SOC configuration pins, where the logic state applied to each pin is latched on the rising edge of PORz. These input signal functions are fixed to their respective pins and are not programmable via MUXMODE.
    • An empty box or "-" means Not Applicable.
    Note:
    • The value found in the MUX MODE AFTER RESET column defines the default pin multiplexed signal function selected when PORz is deasserted.
    • Configuring two pins to the same pin multiplexed signal function can yield unexpected results and is not supported. This can be prevented with proper software configuration.

    • Configuring a pad to an undefined multiplexing mode results in undefined behavior and must be avoided.

  5. Type: Signal type and direction:

    • I = Input

    • O = Output

    • ID = Input, with open-drain output function

    • OD = Output, with open-drain output function

    • IO = Input, Output, or simultaneously Input and Output

    • IOD = Input, Output, or simultaneously Input and Output, with open-drain output function

    • IOZ = Input, Output, or simultaneously Input and Output, with three-state output function

    • OZ = Output with three-state output function

    • A = Analog

    • CAP = LDO capacitor

    • PWR = Power

    • GND = Ground

  6. DSIS: The deselected input state (DSIS) indicates the state driven to the subsystem input (logic "0", logic "1", or "pad" level) when the pin multiplexed signal function is not selected by MUXMODE.
    • 0: Logic 0 driven to the subsystem input.
    • 1: Logic 1 driven to the subsystem input.
    • pad: Logic state of the pad is driven to the subsystem input.
    • An empty box, NA, or "-" means Not Applicable.
  7. Ball State During Reset (RX/TX/PULL): State of the terminal while PORz is asserted, where RX defines the state of the input buffer, TX defines the state of the output buffer, and PULL defines the state of internal pull resistors:
    • RX (Input buffer)
      • Off: The input buffer is disabled.
      • On: The input buffer is enabled.
    • TX (Output buffer)
      • Off: The output buffer is disabled.
      • Low: The output buffer is enabled and drives VOL.
    • PULL (Internal pull resistors)
      • Off: Internal pull resistors are turned off.
      • Up: Internal pull-up resistor is turned on.
      • Down: Internal pull-down resistor is turned on.
      • NA: No internal pull resistor.
    • An empty box, or "-" means Not Applicable.
  8. Ball State After Reset (RX/TX/PULL): State of the terminal after PORz is deasserted, where RX defines the state of the input buffer, TX defines the state of the output buffer, and PULL defines the state of internal pull resistors:
    • RX (Input buffer)
      • Off: The input buffer is disabled.
      • On: The input buffer is enabled.
    • TX (Output buffer)
      • Off: The output buffer is disabled.
      • SS: The subsystem selected with MUXMODE determines the output buffer state.
    • PULL (Internal pull resistors)
      • Off: Internal pull resistors are turned off.
      • Up: Internal pull-up resistor is turned on.
      • Down: Internal pull-down resistor is turned on.
      • NA: No internal pull resistor.
    • An empty box, NA, or "-" means Not Applicable.
  9. Mux Mode After Reset: The value found in this column defines the default pin multiplexed signal function after PORz is deasserted.
    • An empty box, NA, or "-" means Not Applicable.
  10. I/O Voltage: This column describes I/O operating voltage options of the respective power supply, when applicable.
    • An empty box, NA, or "-" means Not Applicable.

    For more information, see valid operating voltage range defined for each power supply in Recommended Operating Conditions.

  11. Power: The power supply of the associated I/O, when applicable.
    • An empty box, NA, or "-" means Not Applicable.
  12. Hys: Indicates if the input buffer associated with this I/O has hysteresis:
    • Yes: Hysteresis Support
    • No: No Hysteresis Support
    • An empty box, NA, or "-" means Not Applicable.

    For more information, see the hysteresis values in Electrical Characteristics.

  13. Pull Type: Indicates the presence of an internal pull-up or pull-down resistor. Internal resistors can be enabled or disabled via software.
    • PU: Internal pull-up Only
    • PD: Internal pull-down Only
    • PU/PD: Internal pull-up and pull-down
    • An empty box, NA, or "-" means No internal pull.
    Note:

    Configuring two pins to the same pin multiplexed signal function is not supported as this yields unexpected results. Issues can be easily prevented with the proper software configuration.

    When a pad is set into a multiplexing mode which is not defined by pin multiplexing, that pad’s behavior is undefined. This must be avoided.

  14. Buffer Type: This column defines the buffer type associated with a terminal. This information can be used to determine the applicable Electrical Characteristics table.
    • An empty box, NA, or "-" means Not Applicable.

    For electrical characteristics, refer to the appropriate buffer type table in Electrical Characteristics.

  15. Pad Configuration Register Name: This is the name of the device pad/pin configuration register.
  16. Pad Configuration Register Address: This is the memory address of the device pad/pin configuration register.
  17. Pad Configuration Register Default Value: This is the default value of the register device pad/pin configuration register after PORz is deasserted.