VersaLogic Blackbird VL-EPU4562 Reference Manual

Blackbird (VL-EPU-4562) Intel® Core™-based Embedded Processing Unit with SATA, Dual Ethernet, USB, Digital I/O, Serial, Video, Mini PCIe Sockets, SPX, Trusted Platform Module.

ii WWW.VERSALOGIC.COM 12100 SW Tualatin Road Tualatin, OR 97062-7341 (503) 747-2261 Fax (971) 224-4708 Copyright © 2017-2018 VersaLogic Corp. All rights reserved. Notice: Although every effort has been made to ensure this document is error-free, VersaLogic makes no representations or warranties with respect to this product and specifically disclaims any implied warranties of merchantability or fitness for any particular purpose. VersaLogic reserves the right to revise this product and associated documentation at any time without obligation to notify anyone of such changes. PC/104, PC/104-Plus, and the PC/104 logo are trademarks of the PC/104 Consortium. * Other names and brands may be claimed as the property of others.

iii Product Release Notes Release 1.1 Updated Uartmode1 – Uart Mode Register #1 section Release 1.0 Initial Release. Support The EPU-4562 support page contains additional information and resources for this product including:  Reference Manual (PDF format)  Operating system information and software drivers  Data sheets and manufacturers’ links for chips used in this product  BIOS information and upgrades  Utility routines and benchmark software The VersaTech KnowledgeBase is an invaluable resource for resolving technical issues with your VersaLogic product. VersaTech KnowledgeBase

iv Contents Introduction ................................................................................................................... 1 Related Documents ............................................................................................................. 1 System Resources ........................................................................................................ 2 Interrupts ............................................................................................................................. 2 FPGA I/O Space ................................................................................................................. 2 FPGA Registers ............................................................................................................. 4 Register Access Key ........................................................................................................... 4 Reset Status Key ................................................................................................................. 4 FPGA Register Map ........................................................................................................... 5 FPGA Register Descriptions............................................................................................... 8 Product Information Registers ............................................................................... 8 BIOS and Jumper Status Register .......................................................................... 9 Timer Registers .................................................................................................... 10 Miscellaneous FPGA Registers ........................................................................... 13 SPI Control Registers .......................................................................................... 18 SPI Data Registers ............................................................................................... 20 SPI Debug Control Register and mSATA/PCIe Select Control Register ............ 21 ADM – ADC Control/Status Register ................................................................. 21 This register is used as the interrupt control/status register for the TI ADS8668A and is primarily related to the ALARM signal output from the A/D. ................. 21 FANCON – Fan Control Register ....................................................................... 31 FANTACHLS, FANTACHMS – FANTACH Status Registers .......................... 32 Programming Information for Hardware Interfaces .................................................. 41 Watchdog Timer ............................................................................................................... 41 Programmable LED .......................................................................................................... 41 Processor WAKE# Capabilities........................................................................................ 42 Tables Table 1: FPGA I/O Map ...................................................................................................... 3 Table 2: FPGA Register Map.............................................................................................. 5 Table 3: PCR – Product Code and LED Register ............................................................... 8 Table 4: PSR – Product Status Register .............................................................................. 8 Table 5: SCR –Status/Control Register .............................................................................. 9 Table 6: TICR – 8254 Timer Interrupt Control Register .................................................. 10 Table 7: TISR – 8254 Timer Interrupt Status Register ..................................................... 11 Table 8: TCR – 8254 Timer Control Register .................................................................. 12 Table 9: MISCSR1 – Misc. Control Register #1 .............................................................. 13

v Table 10: MISCSR2 – Misc. Control Register #2 ............................................................ 15 Table 11: MISCSR3 – Misc. Control Register #3 ............................................................ 16 Table 11: MISCSR4 – Misc. Control Register #4 ............................................................ 17 Table 12: SPI Interface Control Register .......................................................................... 18 Table 13: SPI Interface Status Register ............................................................................ 19 Table 14: SPI – SPI Debug Control Register .................................................................... 21 Table 18: DIODIR1 – Digital I/O 8-1 Direction Control Register ................................... 22 Table 19: DIODIR2 – Digital I/O 16-9 Direction Control Register ................................. 22 Table 20: DIOPOL1 – Digital I/O 8-1 Polarity Control Register ..................................... 23 Table 21: DIOPOL2 – Digital I/O 16-9 Polarity Control Register ................................... 23 Table 22: DIOOUT1 – Digital I/O 8-1 Output Control Register ...................................... 23 Table 23: DIOOUT2 – Digital I/O 16-9 Output Control Register .................................... 23 Table 24: DIOIN1 – Digital I/O 8-1 Input Status Register ............................................... 24 Table 25: DIOIN2 – Digital I/O 16-9 Input Status Register ............................................. 24 Table 26: DIOIMASK1 – Digital I/O 8-1 Interrupt Mask Register .................................. 24 Table 27: DIOIMASK2 – Digital I/O 16-9 Interrupt Mask Register ................................ 24 Table 28: DIOISTAT1 – Digital I/O 8-1 Interrupt Mask Register ................................... 24 Table 29: DIOISTAT2 – Digital I/O 16-9 Interrupt Mask Register ................................. 25 Table 30: DIOCR – Digital I/O Control Register ............................................................. 25 Table 31: AUXDIR – AUX GPIO Direction Control Register ........................................ 26 Table 32: AUXPOL – AUX GPIO Polarity Control Register .......................................... 26 Table 33: AUXOUT – AUX GPIO Output Control Register ........................................... 27 Table 34: AUXIN – AUX GPIO Input Status Register .................................................... 27 Table 35: AUXICR – AUX GPIO Interrupt Mask Register ............................................. 27 Table 36: AUXISTAT – AUX GPIO Interrupt Status Register ........................................ 27 Table 37: AUXMODE1 – AUX I/O Mode Register ........................................................ 28 Table 38: WDT_CTL – Watchdog Control Register ........................................................ 29 Table 39: WDT_VAL – Watchdog Control Register ....................................................... 30 Table 40: XCVRMODE – COM Transceiver Mode Register .......................................... 30 Table 41: AUXMODE2 - AUX I/O Mode Register #2 .................................................... 31 Table 41: FANCON – Fan Control Register .................................................................... 32 Table 41: FANTACHLS – FANTACH Status Register LS Bits ...................................... 33 Table 41: FANTACHMS – FANTACH Status Register MS Bits.................................... 33 Table 42: UART1CR – UART1 Control Register (COM1) ............................................. 34 Table 43: UART2CR – UART2 Control Register (COM2) ............................................. 35 Table 43: UART3CR – UART3 Control Register (COM3) ............................................. 36 Table 43: UART4CR – UART4 Control Register (COM4) ............................................. 37 Table 44: UARTMODE1 – UART MODE Register #1 ................................................... 39 Table 45: UARTMODE2 – UART MODE Register #2 ................................................... 40

1 Introduction This document provides information for users requiring register-level information for developing applications with the VL-EPU-4562. Related Documents The following documents are available on the EPU-4562 Product Support Web Page:  VL-EPU-4562 Hardware Reference Manual – provides information on the board’s hardware features including connectors and all interfaces. Operating System compatibility and software package downloads are available at the VersaLogic Software Support page. 1

2 System Resources Interrupts The LPC SERIRQ is used for interrupt interface to the Skylake SoC. Each of the following devices can have an IRQ interrupt assigned to it and each with an interrupt enable control for IRQ3, IRQ4, IRQ5, IRQ6, IRQ7, IRQ9, IRQ10, and IRQ11:  8254 timers (with three interrupt status bits)  8x GPIOs (with one interrupt status bit per GPIO)16x Digital I/Os (with 1 interrupt status bit per GPIO)  COM 1 UART (with 16550 interrupt status bits)  COM 2 UART (with 16550 interrupt status bits)  COM 3 UART (with the usual 16550 interrupt status bits).  COM 4 UART (with the usual 16550 interrupt status bits).  Watchdog timer (one status bit) Common interrupts can be assigned to multiple devices if software can deal with it (this is common on UARTs being handled by a common ISR). Interrupt status bits for everything except the UARTs will “stick” and are cleared by a “write- one” to a status register bit. The 16550 UART interrupts behave as defined for the 16550 registers and are a pass-through to the LPC SERIRQ. Per the VersaAPI standard, anytime an interrupt on the SERIRQ is enabled, the slot becomes active. All interrupts in the SERIRQ are high-true so when the slot becomes active, the slot will be low when there is no interrupt and high when there is an interrupt. FPGA I/O Space The FPGA is mapped into I/O space on the LPC bus. The address range is mapped into a 64 byte I/O window.  FPGA access: LPC I/O space  FPGA access size: All 8-bit byte accesses (16-bit like registers are aligned on 16-bit word boundaries to make word access possible in software but the LPC bus still splits the accesses into two 8-bit accesses)  FPGA address range: 0x1C80 to 0x1CBF (a 64-byte window) The three 8254 timers only require four bytes of addressing and are located at the end of the 64-byte I/O block. The only requirement is that the base address must be aligned on a 4-byte block. The table below lists the FPGA’s I/O map. 2

EPU-4562 Programmer’s Reference Manual 3 Table 1: FPGA I/O Map Address Range Device Size 0x1C80 – 0x1CBB FPGA registers 60 bytes 0x1CBC – 0x1CBF 8254 timer address registers 4 bytes

4 FPGA Registers This chapter describes the FPGA registers.  Table 2 (beginning on the following page) lists all 64 FPGA registers  Table 3 (refer to page 8) through Table 48 provide bit-level information on the individual FPGA registers Register Access Key Key: R/W Read/Write RO Read-Only R/WC Read-Status/Write-1-to-Clear WO Write-Only ROC Read-Only and clear-to-0 after reading RSVD Not implemented. Returns 0 when read. Writes are ignored Reset Status Key Reset Status Key POR Power-on reset (only resets one time when input power comes on) Platform Resets prior to the processor entering the S0 power state (that is, at power-on and in sleep states) resetSX • If AUX_PSEN is a '0' in MISCSR1 (default setting), then this is the same as the Platform reset. • If AUX_PSEN is programmed to a '1', then it is the same as the Power-On Reset (POR). n/a Reset doesn't apply to status or reserved registers 3

5 FPGA Register Map Table 2: FPGA Register Map I/O Address Offset Reset D7 D6 D5 D4 D3 D2 D1 D0 C80 0 Platform PLED PRODUCT_CODE C81 1 n/a REV_LEVEL EXTEMP CUSTOM BETA C82 2 Platform BIOS_JMP BIOS_OR BIOS_SEL LED_DEBUG WORKVER 0 WP_JMP WP_EN C83 3 Platform IRQEN IRQSEL2 IRQSEL1 IRQSEL0 0 IMASK_TC5 IMASK_TC4 IMASK_TC3 C84 4 Platform INTRTEST TMRTEST TMRIN4 TMRIN3 0 ISTAT_TC5 ISTAT_TC4 ISTAT_TC3 C85 5 Platform TIM5GATE TIM4GATE TIM3GATE TM45MODE TM4CLKSEL TM3CLKSEL TMROCTST TMRFULL C86 6 n/a 0 0 0 0 0 0 0 0 C87 7 n/a 0 0 0 0 0 0 0 0 C88 8 Platform CPOL CPHA SPILEN1 SPILEN0 MAN_SS SS2 SS1 SS0 C89 9 Platform IRQSEL1 IRQSEL0 SPICLK1 SPICLK0 HW_IRQ_EN LSBIT_1ST HW_INT BUSY C8A A Platform msb <============> lsb C8B B Platform msb <============> lsb C8C C Platform msb <============> lsb C8D D Platform msb <============> lsb C8E E Platform 0 MUXSEL2 MUXSEL1 MUXSEL0 0 SERIRQEN SPILB DACLDA C8F F Platform IRQEN IRQSEL2 IRQSEL1 IRQSEL0 ADC_RESET IN_ALARM ISTAT_ALARM IMASK_ALAR M C90 10 POR 0 0 0 0 MINI3_PSDIS MINI2_PSDIS AUX_PSEN MINI1_PSDIS C91 11 POR USB_HUBMOD E W_DISABLE USB_HUBDIS ETH0_OFF USB2_OC2 USB2_OC1 USB2_DIS2 USB2_DIS1 C92 12 Platform PROCHOT LVDS_OC 0 0 0 PBRESET 0 TPM_PP C93 13 POR 0 0 USB3_OC2 USB3_OC1 0 0 USB3_DIS2 USB3_DIS1 C94 14 resetSX DIR_DIO8 DIR_DIO7 DIR_DIO6 DIR_DIO5 DIR_DIO4 DIR_DIO3 DIR_DIO2 DIR_DIO1 C95 15 resetSX DIR_DIO16 DIR_DIO15 DIR_DIO14 DIR_DIO13 DIR_DIO12 DIR_DIO11 DIR_DIO10 DIR_DIO9 C96 16 resetSX POL_DIO8 POL_DIO7 POL_DIO6 POL_DIO5 POL_DIO4 POL_DIO3 POL_DIO2 POL_DIO1 C97 17 resetSX POL_DIO16 POL_DIO15 POL_DIO14 POL_DIO13 POL_DIO12 POL_DIO11 POL_DIO10 POL_DIO9 C98 18 resetSX OUT_DIO8 OUT_DIO7 OUT_DIO6 OUT_DIO5 OUT_DIO4 OUT_DIO3 OUT_DIO2 OUT_DIO1 C99 19 resetSX OUT_DIO16 OUT_DIO15 OUT_DIO14 OUT_DIO13 OUT_DIO12 OUT_DIO11 OUT_DIO10 OUT_DIO9 C9A 1A n/a IN_DIO8 IN_DIO7 IN_DIO6 IN_DIO5 IN_DIO4 IN_DIO3 IN_DIO2 IN_DIO1 C9B 1B n/a IN_DIO16 IN_DIO15 IN_DIO14 IN_DIO13 IN_DIO12 IN_DIO11 IN_DIO10 IN_DIO9

6 I/O Address Offset Reset D7 D6 D5 D4 D3 D2 D1 D0 C9C 1C Platform IMASK_DIO8 IMASK_DIO7 IMASK_DIO6 IMASK_DIO5 IMASK_DIO4 IMASK_DIO3 IMASK_DIO2 IMASK_DIO1 C9D 1D Platform IMASK_DIO16 IMASK_DIO15 IMASK_DIO14 IMASK_DIO13 IMASK_DIO12 IMASK_DIO11 IMASK_DIO10 IMASK_DIO9 C9E 1E Platform ISTAT_DIO8 ISTAT_DIO7 ISTAT_DIO6 ISTAT_DIO5 ISTAT_DIO4 ISTAT_DIO3 ISTAT_DIO2 ISTAT_DIO1 C9F 1F Platform ISTAT_DIO16 ISTAT_DIO15 ISTAT_DIO14 ISTAT_DIO13 ISTAT_DIO12 ISTAT_DIO11 ISTAT_DIO10 ISTAT_DIO9 CA0 20 Platform IRQEN IRQSEL2 IRQSEL1 IRQSEL0 0 0 0 TMREN CA1 21 resetSX DIR_GPIO8 DIR_GPIO7 DIR_GPIO6 DIR_GPIO5 DIR_GPIO4 DIR_GPIO3 DIR_GPIO2 DIR_GPIO1 CA2 22 resetSX POL_GPIO8 POL_GPIO7 POL_GPIO6 POL_GPIO5 POL_GPIO4 POL_GPIO3 POL_GPIO2 POL_GPIO1 CA3 23 resetSX OUT_GPIO8 OUT_GPIO7 OUT_GPIO6 OUT_GPIO5 OUT_GPIO4 OUT_GPIO3 OUT_GPIO2 OUT_GPIO1 CA4 24 n/a IN_GPIO8 IN_GPIO7 IN_GPIO6 IN_GPIO5 IN_GPIO4 IN_GPIO3 IN_GPIO2 IN_GPIO1 CA5 25 Platform IMASK_GPIO8 IMASK_GPIO7 IMASK_GPIO6 IMASK_GPIO5 IMASK_GPIO4 IMASK_GPIO3 IMASK_GPIO2 IMASK_GPIO1 CA6 26 Platform ISTAT_GPIO8 ISTAT_GPIO7 ISTAT_GPIO6 ISTAT_GPIO5 ISTAT_GPIO4 ISTAT_GPIO3 ISTAT_GPIO2 ISTAT_GPIO1 CA7 27 resetSX MODE_GPIO8 MODE_GPIO7 MODE_GPIO6 MODE_GPIO5 MODE_GPIO4 MODE_GPIO3 MODE_GPIO2 MODE_GPIO1 CA8 28 Platform IRQEN IRQSEL2 IRQSEL1 IRQSEL0 0 RESET_EN WDT_EN WDT_STAT CA9 29 Platform msb <============> lsb CAA 2A Platform 0 0 0 0 COM4_MODE COM3_MODE COM2_MODE COM1_MODE CAB 2B Platform IRQEN IRQSEL2 IRQSEL1 IRQSEL0 0 0 0 0 CAC 2C Platform COM_MODE 0 0 0 0 0 0 FAN_OFF CAD 2D n/a 0 0 0 0 0 0 0 0 CAE 2E Platform msb <============> lsb CAF 2F Platform msb <============> lsb CB0 30 n/a 0 0 0 0 0 0 0 0 CB1 31 n/a 0 0 0 0 0 0 0 0 CB2 32 Platform IRQEN IRQSEL2 IRQSEL1 IRQSEL0 UART1_BASE 3 UART1_BASE 2 UART1_BASE 1 UART1_BASE0 CB3 33 Platform IRQEN IRQSEL2 IRQSEL1 IRQSEL0 UART2_BASE 3 UART2_BASE 2 UART2_BASE 1 UART2_BASE0 CB4 34 Platform IRQEN IRQSEL2 IRQSEL1 IRQSEL0 UART3_BASE 3 UART3_BASE 2 UART3_BASE 1 UART3_BASE0 CB5 35 Platform IRQEN IRQSEL2 IRQSEL1 IRQSEL0 UART4_BASE 3 UART4_BASE 2 UART4_BASE 1 UART4_BASE0 CB6 36 Platform UART4_485ADC UART3_485ADC UART2_485ADC UART1_485ADC UART4_EN UART3_EN UART2_EN UART1_EN CB7 37 Platform 0 0 0 0 0 0 0 FAST_MODE CB8 38 n/a 0 0 0 0 0 0 0 0 CB9 39 n/a 0 0 0 0 0 0 0 0 CBA 3A n/a 0 0 0 0 0 0 0 0

7 I/O Address Offset Reset D7 D6 D5 D4 D3 D2 D1 D0 CBB 3B n/a 0 0 0 0 0 0 0 0 CBC 3C Platform msb <============> lsb CBD 3D Platform msb <============> lsb CBE 3E Platform msb <============> lsb CBF 3F Platform msb <============> lsb

8 FPGA Register Descriptions Key: R/W Read/Write RO Read-Only R/WC Read-Status/Write-1-to-Clear WO Write-Only ROC Read-Only and clear-to-0 after reading RSVD Not implemented. Returns 0 when read. Writes are ignored PRODUCT INFORMATION REGISTERS This register drives the PLED on the paddleboard. It also provides read access to the product code. Table 3: PCR – Product Code and LED Register Bit Identifier Access Default Description 7 PLED R/W 0 Drives the programmable LED on the paddleboard. 0 – LED is off (default) 1 – LED is on 6-0 PRODUCT_CODE RO 0010011 Product Code for the EPU-4562 (0x13) Table 4: PSR – Product Status Register Bit Identifier Access Default Description 7:3 REV_LEVEL[4:0] RO N/A Revision level of the PLD (incremented every FPGA release) 0 – Indicates production release revision level when BETA status bit (bit 0) is set to ‘0’ 1 – Indicates development release revision level when BETA status bit (bit 0) is set to ‘1’ 2 EXTEMP RO N/A Extended or Standard Temp Status (set via external resistor): 0 – Standard Temp 1 – Extended Temp (always set) 1 CUSTOM RO N/A Custom or Standard Product Status (set in FPGA): 0 – Standard Product 1 – Custom Product or PLD/FPGA 0 BETA RO N/A Beta or Production Status (set in FPGA): 1 – Beta (or Debug) 0 – Production

9 BIOS AND JUMPER STATUS REGISTER Table 5: SCR –Status/Control Register Bit Identifier Access Default Description 7 BIOS_JMP RO N/A Status of the external BIOS switch (jumper): 1 – Primary BIOS selected (the one on the COM Module) 0 – Backup BIOS selected (the one on the base board) Note: For this implementation this reads the status of the jumper all the time is essentially the “AND” of the jumper setting and (if the BIOS_OR is set to a ‘1’) the BIOS_SEL setting. Note that if BIOS_SEL sets a ‘1’ but a ‘0’ is read here then that means the external jumper is installed. 6 BIOS_OR R/W 0 BIOS Switch (jumper) Override 0 – BIOS Select will follow the BIOS_JMP switch setting (FPGA BIOS_SEL setting has no affect) 1 – BIOS Select will follow the BIOS_SEL register setting 5 BIOS_SEL R/W 0 BIOS Select (see BIOS_OR): 0 – Primary BIOS selected (the one on the COM Module) 1 – Backup BIOS selected (the one on the base board) Note: If the external BIOS configuration jumper is set to Backup then setting this will not have any affect. The jumper must not be installed to use this selection mode. Must have BIOS_OR set to a ‘1’ for this to have any affect. 4 LED_DEBUG R/W 0 Debug LED (controls the yellow LED): 0 – LED is off and follows its primary function (MSATA_DAS) 1 – LED is on 3 WORKVER RO N/A Status used to indicate that the FPGA is not officially released and is still in a working state. 0 – FPGA is released 1 – FPGA is in a working state (not released) 2 RESERVED RO N/A Reserved. Writes are ignored; reads always return 0. 1 WP_JMP RO N/A Back-up BIOS Write protect jumper status. WP_EN has to be set to a ‘0’ to read the actual jumper. 0 – Jumper is installed (write-protect is enabled) 1 – Jumper is removed (not write protected) 0 WP_EN R/W 0 Back-up BIOS Write protect control. It drives an open-drain output. 0 – not write protected (open-drain output is Hi-Z so WP jumper can be read) 1 – write protected (drives output low)

10 TIMER REGISTERS The FPGA implements an 8254-compatible timer/counter that includes three 16-bit timers. Table 6: TICR – 8254 Timer Interrupt Control Register Bit Identifier Access Default Description 7 IRQEN R/W 0 8254 Timer interrupt enable/disable: 0 – Interrupts disabled 1 – Interrupts enabled 6-4 IRQSEL(2:0) R/W 000 8254 Timer interrupt IRQ select in LPC SERIRQ: 000 – IRQ3 001 – IRQ4 010 – IRQ5 011 – IRQ10 100 – IRQ6 101 – IRQ7 110 – IRQ9 111 – IRQ11 3 RESERVED RO 0 Reserved. Writes are ignored; reads always return 0. 2 IMASK_TC5 R/W 0 8254 timer #5 interrupt mask: 0 – Interrupt disabled 1 – Interrupt enabled 1 IMASK_TC4 R/W 0 8254 timer #4 interrupt mask: 0 – Interrupt disabled 1 – Interrupt enabled 0 IMASK_TC3 R/W 0 8254 timer #3 interrupt mask: 0 – Interrupt disabled 1 – Interrupt enabled

11 Table 7: TISR – 8254 Timer Interrupt Status Register Bit Identifier Access Default Description 7 RESERVED RO 0 Reserved. Writes are ignored; reads always return 0. 6 RESERVED RO 0 Reserved. Writes are ignored; reads always return 0. 5 RESERVED RO 0 Reserved. Writes are ignored; reads always return 0. 4 RESERVED RO 0 Reserved. Writes are ignored; reads always return 0. 3 RESERVED RO 0 Reserved. Writes are ignored; reads always return 0. 2 ISTAT_TC5 RW/C N/A Status for the 8254 Timer #5 output (terminal count) interrupt when read. This bit is read-status and a write-1-to-clear. 0 – Timer output (terminal count) has not transitioned from 0 to a 1 level 1 – Timer output (terminal count) has transitioned from a 0 to a 1 level 1 ISTAT_TC4 RW/C N/A Status for the 8254 Timer #4 output (terminal count) interrupt when read. This bit is read-status and a write-1-to-clear. 0 – Timer output (terminal count) has not transitioned from 0 to a 1 level 1 – Timer output (terminal count) has transitioned from a 0 to a 1 level 0 ISTAT_TC3 RW/C N/A Status for the 8254 Timer #3 output (terminal count) interrupt when read. This bit is read-status and a write-1-to-clear. 0 – Timer output (terminal count) has not transitioned from 0 to a 1 level 1 – Timer output (terminal count) has transitioned from a 0 to a 1 level

12 Table 8: TCR – 8254 Timer Control Register Bit Identifier Access Default Description 7 TMR5GATE R/W 0 Debug/Test Only: Controls the “gate” signal on 8254 timer #5 when not using an external gate signal: 0 – Gate on signal GCTC5 is disabled 1 – Gate on signal GCTC5 is enabled Always set to 0 when configuring timer modes except when TMRFULL is ‘0’ and then it should be set to ‘1’ and not changed unless using internal clocking. 6 TMR4GATE R/W 0 Debug/Test Only: Controls the “gate” signal on 8254 timer #4 when not using an external gate signal: 0 – Gate on signal GCTC4 is disabled 1 – Gate on signal GCTC4 is enabled Always set to 0 when configuring timer modes except when TMRFULL is ‘0’ and then it should be set to ‘1’ and not changed unless using internal clocking 5 TMR3GATE R/W 0 Debug/Test Only: Controls the “gate” signal on 8254 timer #3 when not using an external gate signal: 0 – Gate on signal GCTC3 is disabled 1 – Gate on signal GCTC3 is enabled Always set to 0 when configuring timer modes except when TMRFULL is ‘0’ and then it should be set to ‘1’ and not changed unless using internal clocking 4 TM45MODE R/W 0 Mode to set timers #4 and #5 in: 0 – Timer #4 and #5 form one 32-bit timer controlled by timer #1 signals 1 – Timer #4 and Timer #5 are separate 16-bit timers with their own control signals. Almost always used in 32-bit mode especially when TMRFULL is a ‘0’ (the 16-bit timer #5 if of limited use) 3 TM4CLKSEL R/W 0 Timer #4 Clock Select: 0 – Use internal 4.125 MHz clock (derived from LPC clock) 1 – Use external ICTC4 assigned to digital I/O Timer #5 is always on internal clock if configured as a 16-bit clock 2 TM3CLKSEL R/W 0 Timer #3 Clock Select: 0 – Use internal 4.125 MHz clock (derived from LPC clock) 1 – Use external ICTC3 assigned to digital I/O 1 TMROCTST R/W 0 Debug/Test Only: Used to derive OCTCx outputs with TIMxGATE signals for continuity testing only: 0 – Normal operation 1 – Drive OCTCx outputs with corresponding TMRxGATE control registers (for example, OCTC4 with TMR4GATE) for continuity testing. 0 TMRFULL R/W 0 This bit can be read or written to, but it has no function.

13 MISCELLANEOUS FPGA REGISTERS MISCSR1 – Miscellaneous Control Register #1 This is a register in the always-on power well of the FPGA. It holds its state during sleep modes and can only be reset by a power cycle. This is a placeholder register for features like pushing the power-button and also for software initiated resets should those be needed. Reset: This register is only reset by the main power-on reset since it must maintain its state in Sleep modes (for example, S3). Table 9: MISCSR1 – Misc. Control Register #1 Bits Identifier Access Default Description 7-4 Reserved RO 00000 Reserved. Writes are ignored; reads always return 0. 2 MINI2_PSDIS R/W 0 Minicard #2 3.3 V power disable 0 – Minicard 3.3 V power stays on always (this is normally how minicards operate if they support any Wake events) 1 – Minicard 3.3 V power will be turned off when not in S0 (in sleep modes). The Minicard 3.3 V power switch is controlled by the “OR” of the S0 power control signal and the inverse of MINI2_PSDIS. 1 AUX_PSEN R/W 0 CBR-4005B 8xGPIO (sometimes called “AUX” GPIOs) I/O Power Enable 0 – The GPIO pullups will be powered down in sleep modes (only power in S0) 1 – The GPIO pullups will not be powered down in sleep modes and the configuration will remain. This power is used for both the GPIO pullup voltage and for the 3.3V power on Pin 37 of the User Interface connector J2. Note: Some register resets are conditional on the state of AUX_PSEN 0 MINI1_PSDIS R/W 0 Minicard #1 3.3 V power disable 0 – Minicard 3.3 V power stays on always (this is normally how minicards operate if they support any Wake events) 1 – Minicard 3.3 V power will be turned off when not in S0 (in sleep modes). The Minicard 3.3 V power switch is controlled by the “OR” of the S0 power control signal and the inverse of MINI1_PSDIS.

14 MISCSR2 – Miscellaneous Control Register #2 This is a register in the always-on power well of the FPGA. It holds its state during sleep modes and can only be reset by a power cycle. It is primarily used for control signals for the always- powered Ethernet controllers and the USB hubs. This register is only reset by the main power-on reset since it must maintain its state in sleep modes (for example, S3).

15 Table 10: MISCSR2 – Misc. Control Register #2 Bit Identifier Access Default Description 7 USB_HUBMODE R/W 0 Determines whether the hub resets only once (to support wake-up from sleep modes on USB ports) or resets every time it enters sleep modes using the platform reset: 0 – USB Hub will be reset once at power on. Use USB_HUBDIS to manually control the reset if necessary. This supports USB Wake-up modes 1 – USB Hub will be reset by platform reset every time (will be reset when entering all sleep modes). USB ports cannot be used to wake-up 6 W_DISABLE R/W 0 Controls the W_DISABLE (Wireless Disable) signal going to the PCIe Minicards (disables both minicards if asserted): 0 – W_DISABLE signal is not asserted (Enabled) 1 – W_DISABLE signal is asserted (Disabled) Note: There are other control sources that can be configured to control this signal and if enabled the control becomes the “OR” of all sources 5 USB_HUBDIS R/W 0 Control the reset on the USB2513B Hub (used for 3x Minicard USB ports). 0 – USB2513 Hub is Enabled (reset released) 1 – USB2513 Hub is in Reset Note: FPGA was changed so that Platform reset drives this reset once at power on. 4 ETHOFF0 R/W 0 Disables Ethernet controller #0 (controls the ETH_OFF# input to the I210-IT): 0 – Ethernet controller is enabled (On) 1 – Ethernet controller is disabled (Off) 3 USB2_OC2 RO N/A Overcurrent Status from the USB 2.0 port 2,3 VBUS power switches. This signal also passed to the fourth USB_6_7_OC# input on the COM Express connector. 0 – VBUS power switch is not in overcurrent (either OK or disabled) 1 – VBUS power switch is in overcurrent and is now off. Note: The power switches latch-off in overcurrent and can only be re- enabled by a power-cycle or by setting this bit to a ‘1’, wait >1msec and then a ‘0’ 2 USB2_OC1 RO N/A Overcurrent Status from the USB 2.0 port 0,1 VBUS power switches. This signal also passed to the third USB_4_5_OC# input on the COM Express connector. 0 – VBUS power switch is not in overcurrent (either OK or disabled) 1 – VBUS power switch is in overcurrent and is now off. Note: The power switches latch-off in overcurrent and can only be re- enabled by a power-cycle or by setting this bit to a ‘1’, wait >1msec and then a ‘0’ 1 USB2_DIS2 R/W 0 Disable control for the paddleboard USB 2.0 ports 2,3 VBUS power switches (there are two power-switches but they have a common power enable and overcurrent status) 0 – VBUS power switches are enabled 1 – VBUS power switched are disabled. Note: The power switches latch-off in overcurrent and can only be re- enabled by a power-cycle or by setting this bit to a ‘1’, wait >1msec and then a ‘0’

16 Bit Identifier Access Default Description 0 USB2_DIS1 R/W 0 Disable control for the paddleboard USB 2.0 ports 0,1 VBUS power switches (there are two power-switches but they have a common power enable and overcurrent status) 0 – VBUS power switches are enabled 1 – VBUS power switched are disabled. Note: The power switches latch-off in overcurrent and can only be re- enabled by a power-cycle or by setting this bit to a ‘1’, wait >1msec and then a ‘0’ MISCSR3 – Miscellaneous Control Register #3 This register enables software to “push” the reset button. Table 11: MISCSR3 – Misc. Control Register #3 Bits Identifier Access Default Description 7 PROCHOT RO N/A The status of the THERMTRIP signal from the CPU module. 0 – THERMTRIP is not asserted (not hot) 1 – THERMTRIP is asserted 6 LVDS_OC RO N/A The overcurrent status from the LVDS panel power switch. If this is ever asserted, the LVDS panel enable signal must be de-asserted and then asserted to “unlatch” the power fault condition on the power switch. 0 – LVDS Overcurrent is not asserted 1 – LVDS Overcurrent is asserted 3-5 Reserved RO N/A Reads the overcurrent status for the USB paddleboard power switches (there are two power switches for the four ports but they have a common overcurrent status). 0 – Overcurrent is not asserted (power switch is on) 1 – Overcurrent is asserted (power switch is off) 2 PBRESET R/W --- When written to, this will do the same thing as pushing the reset button, which could be useful for a software-initiated watchdog. 0 – No action 1 – Activate the reset push-button Note: Because this generates a reset that will reset this register, it isn’t likely a value of a ‘1’ can ever be read-back, so it is somewhat “write-only”. 1-0 Reserved RO 00 Reserved. Writes are ignored; reads always return 0.

17 MISCSR4 – Miscellaneous Control Register #4 This register is used to monitor the overcurrent status of the 2x USB 3.0 VBUS power switch. Table 12: MISCSR4 – Misc. Control Register #4 Bits Identifier Access Default Description 7 RESERVED RO 0 Reserved – Writes are ignored. Reads always return 0 6 RESERVED RO 0 Reserved – Writes are ignored. Reads always return 0 5 USB3_OC2 RO N/A The status of the overcurrent signal on VBUS power switch for second USB 3.0 Port 2. This signal also passed to the second USB_2_3_OC# input on the COM Express connector. 0 – USB 3.0 VBUS power switch is operating normally or it is disabled 1 – USB 3.0 VBUS power switch is in an overcurrent shutdown state and must be restarted 4 USB3_OC1 RO N/A The status of the overcurrent signal on VBUS power switch for first USB 3.0 Port 1. This signal also passed to the first USB_0_1_OC# input on the COM Express connector. 0 – USB 3.0 VBUS power switch is operating normally or it is disabled 1 – USB 3.0 VBUS power switch is in an overcurrent shutdown state and must be restarted 3 RESERVED RO 0 Reserved – Writes are ignored. Reads always return 0 2 RESERVED RO 0 Reserved – Writes are ignored. Reads always return 0 1 USB3_DIS2 R/W 0 Used to control the enable on VBUS power switch for second USB 3.0 Port 2. 0 – USB 3.0 VBUS power switch is enabled 1 – USB 3.0 VBUS power switch is disabled 0 USB3_DIS1 R/W 0 Used to control the enable on VBUS power switch for first USB 3.0 Port 1. 0 – USB 3.0 VBUS power switch is enabled 1 – USB 3.0 VBUS power switch is disabled

18 SPI CONTROL REGISTERS These are placed at the traditional offset 0x8 location. Only external SPX interface devices use this interface. Because the board uses a 9-pin SPX connector, only two devices are supported. SPICONTROL Table 13: SPI Interface Control Register Bit Identifier Acces s Default Description 7 CPOL R/W 0 SPI clock polarity – Sets the SCLK idle state. 0 – SCLK idles low 1 – SCLK idles high 6 CPHA R/W 0 SPI clock phase – Sets the SCLK edge on which valid data will be read. 0 – Data is read on rising edge 1 – Data is read on falling edge 5-4 SPILEN(1:0) R/W 00 Determines the SPI frame length. This selection works in manual and auto slave select modes. 00 – 8-bit 01 – 16-bit 10 – 24-bit 11 – 32-bit 3 MAN_SS R/W 0 Determines whether the slave select lines are asserted through the user software or are automatically asserted by a write to SPIDATA3. 0 - The slave select operates automatically 1 - The slave select line is controlled manually through SPICONTROL bits SS[2:0] 2-0 SS(2:0) R/W 000 SPI slave device selection: 000 – None 001 – SS0# 010 – SS1# 011 – Undefined (ignored) 100 – Undefined (ignored) 101 – Undefined (ignored) 110 – Undefined (ignored) 111 – Undefined (ignored)

19 SPISTATUS The SPX interrupt is not connected on this product. The control bits and status associated are still defined in the register set but the SPX interrupt will always be de-asserted. Table 14: SPI Interface Status Register Bits Identifier Access Default Description 7-6 IRQSEL[1:0] R/W 00 The SPX interrupt is not connected on this product (always de- asserted). Selects which IRQ will be enabled if HW_IRQ_EN = 1. Interrupts are not used on this board, so this just becomes a read/write non- functional field. 00 – IRQ3 01 – IRQ4 10 – IRQ5 11 – IRQ10 Note: These are the first four interrupts in the “usual” LPC SERIRQ group of eight interrupts. 5-4 SPICLK(1:0) R/W 00 Selects one of four SCLK frequencies. This is based on a 33 MHz LPC clock. 00 – 0.75Mhz(24Mhz/32) 01 – 1.5 Mhz(24Mhz/16) 10 – 2 Mhz(24 Mhz/8) 11 – 6 Mhz (24Mhz/4) 3 HW_IRQ_EN R/W 0 The SPX interrupt is not connected on this product (always de- asserted). This enables the selected IRQ to be activated by a SPI device that is configured to use its interrupt capability. 0 - IRQs are disabled for SPI operations. 1 - The IRQ can be asserted 2 LSBIT_1ST R/W 0 Controls the SPI shift direction from the SPIDATA(x) registers. 0 - Data is left-shifted (MSB first). 1 - Data is right-shifted (LSB first) 1 HW_INT RO 0 SPX interrupt is not connected on this product (always de-asserted). Status flag which indicates when the hardware SPX signal SINT# is asserted. 0 - The hardware interrupt SINT# is de-asserted. 1 - An interrupt is present on SINT# If HW_IRQ_EN= 1, the selected IRQ will also be asserted by the hardware interrupt. HW_INT is read-only and is cleared when the external hardware interrupt is no longer present. 0 BUSY RO N/A Status flag which indicates when an SPI transaction is underway. I2C is so slow that there is no reason to ever poll this. 0 - The SPI bus is idle. 1 - SCLK is clocking data in/out of the SPIDATA(x) registers (that is, busy)

20 SPI DATA REGISTERS There are four data registers used on the SPI interface. How many are used depends on the device being communicated with. SPIDATA0 is typically the least significant byte and SPIDATA3 is the most significant byte. Any write to the most significant byte SPIDATA3 initiates the SCLK and, depending on the MAN_SS state, will assert a slave select to begin an SPI bus transaction. Data is sent according to the LSBIT_1ST setting. When LSBIT_1ST = 0, the MSbit of SPIDATA3 is sent first and received data will be shifted in the LSbit of the selected frame size determined by SPILEN1 and SPILEN0. When LSBIT_1ST = 1, the LSbit of the selected frame size is sent first and the received data will be shifted in the MSbit of SPIDATA3. SPIDATA0 (Least Significant Byte) D7 D6 D5 D4 D3 D2 D1 D0 MSB LSB SPIDATA1 D7 D6 D5 D4 D3 D2 D1 D0 MSB LSB SPIDATA2 D7 D6 D5 D4 D3 D2 D1 D0 MSB LSB SPIDATA3 (Most Significant Byte) [Cycle Trigger Register] D7 D6 D5 D4 D3 D2 D1 D0 MSB LSB

21 SPI DEBUG CONTROL REGISTER AND MSATA/PCIE SELECT CONTROL REGISTER This register is only used to set an SPI loopback (debug/test only) but is also used for the mSATA/PCIe Minicard Mux select. Table 15: SPI – SPI Debug Control Register Bit Identifier Access Default Description 7 Reserved RO 0 Reserved. Writes are ignored; reads always return 0. 6-4 MUXSEL(2:0) R/W 000 mSATA/PCIe Mux selection for Minicard slot (and 2nd SATA connector): • 000 – Select mSATA using only pin 43 (MSATA_DETECT). This is an Intel-mode that is reliable for PCIe Minicards but not for mSATA modules that inadvertently ground this signal. • 001 – Use only Pin 51 (PRES_DISABLE2#). This is the default method and is defined in the Draft mSATA spec but some Minicards use it as a second wireless disable. • 010 – Use either Pin 43 or Pin 51. This will work just like 001 because Pin 43 is disabled by an FPGA pull-down. • 011 – Force PCIe mode on the Minicard • 100 – Force mSATA mode on the Minicard. • 101 – Undefined (same as 000) • 110 – Undefined (same as 000) • 111 – Undefined (same as 000) Note: When the Minicard uses PCIe, the SATA channel automatically switches to the SATA connector. 3 Reserved RO 0 Reserved. Writes are ignored; reads always return 0. 2 SERIRQEN R/W 0 When an IRQ is assigned a slot in the SERIRQ, it will drive the slot with the interrupt state, but this bit must be set to a ‘1’ to do that. 0 – Slots assigned to SERIRQ are not driven (available for other devices). 1 – Slots assigned to SERIRQ are driven with their current interrupt state (which is low since interrupts are high-true). This is because the default interrupt settings in this FPGA can conflict with other interrupts if the VersaAPI is not being used (for example, console redirect using IRQ3). 1 SPILB R/W 0 Debug/Test Only: Used to loop SPI output data back to the input (debug/test mode). 0 – Normal operation 1 – Loop SPI output data back to the SPI input data (data output still active) 0 Reserved RO 0 Reserved. Writes are ignored; reads always return 0. ADM – ADC CONTROL/STATUS REGISTER This register is used as the interrupt control/status register for the TI ADS8668A and is primarily related to the ALARM signal output from the A/D. Bit Identifier Access Default Description 7 IRQEN R/W 0 ADC ALARM Interrupt Enable/Disable. 0 – Interrupts disabled 1 – Interrupts enabled. Note: This is essentially the interrupt mask.

22 Bit Identifier Access Default Description 6-4 IRQSEL(2:0) R/W 000 ADC ALARM Interrupt IRQ Select in LPC SERIRQ: 000 – IRQ3 001 – IRQ4 010 – IRQ5 011 – IRQ10 100 – IRQ6 101 – IRQ7 110 – IRQ9 111 – IRQ11 FYI – same values are other products. 3 ADC_RESET R/W 0 ADS8668A ADC RESET 0 – deassert reset (normal operation) 1 – assert reset NOTE: Always assert this for >400nsec since the part has some strange modes for shorter resets. Regardless a standard Platform reset will reset the A/D to a power-on reset state. 2 IN_ALARM RO N/A Returns the ADS8668A ADC ALARM status value. 0 – ALARM is deasserted 1 – ALARM is asserted 1 ISTAT_ALARM RO N/A ADC ALARM interrupt status. A read returns the interrupt status. Writing a ‘1’ will clear the interrupt status. This bit is set to a ‘1’ on a transition from low-to-high of the ADC ALARM signal (alarm assertion) 0 IMASK_ALARM RW 0 ADC ALARM Interrupt Mask: 0 – Interrupt disabled 1 – Interrupt enabled. DIODIRx (x=1,2) – Digital I/O Direction Control Registers These two registers control the directions of the 16 digital I/O signals. This reset depends on the state of the FPGA_PSEN signal. If FPGA_PSEN is a ‘0’ then the reset is the power-on and Platform Reset. If FPGA_PSEN is a ‘1’ then this register is only reset at power-on. Table 16: DIODIR1 – Digital I/O 8-1 Direction Control Register Bits Identifier Access Default Description 7-0 DIR_DIO[8:1] R/W 0x00 Sets the DIOx direction. For each bit: 0 – Input 1 – Output Table 17: DIODIR2 – Digital I/O 16-9 Direction Control Register Bits Identifier Access Default Description 7-0 DIR_DIO[16:9] R/W 0x00 Sets the DIOx direction. For each bit: 0 – Input 1 – Output

23 DIOPOLx (x=1,2) – Digital I/O Polarity Control Registers These two registers control the polarity of the 16 Digital I/O signals. This reset depends on the state of the FPGA_PSEN signal. If FPGA_PSEN is a ‘0’ then the reset is the power-on and Platform Reset. If FPGA_PSEN is a ‘1’ then this register is only reset at power-on. Table 18: DIOPOL1 – Digital I/O 8-1 Polarity Control Register Bits Identifier Access Default Description 7-0 POL_DIO[8:1] R/W 0x00 Sets the DIOx polarity. For each bit: 0 – No polarity inversion 1 – Invert polarity Table 19: DIOPOL2 – Digital I/O 16-9 Polarity Control Register Bits Identifier Access Default Description 7-0 POL_DIO[16:9] R/W 0x00 Sets the DIOx polarity. For each bit: 0 – No polarity inversion 1 – Invert polarity DIOOUTx (x=1,2) – Digital I/O Output Control Registers These two registers set the DIO output value. This value will only set the actual output if the DIO direction is set as an output. Reading this register does not return the actual input value of the DIO (use the DIOIN register for that). As such, this register can actually be used to detect input/output conflicts. This reset depends on the state of the FPGA_PSEN signal. If FPGA_PSEN is a ‘0’ then the reset is the power-on and Platform Reset. If FPGA_PSEN is a ‘1’ then this register is only reset at power-on. Table 20: DIOOUT1 – Digital I/O 8-1 Output Control Register Bits Identifier Access Default Description 7-0 OUT_DIO[8:1] R/W 0x00 Sets the DIOx output. For each bit: 0 – De-asserts the output (0 if polarity not inverted, 1 if inverted) 1 – Asserts the output (1 if polarity not-inverted, 0 if inverted) Table 21: DIOOUT2 – Digital I/O 16-9 Output Control Register Bits Identifier Access Default Description 7-0 OUT_DIO[16:9] R/W 0x00 Sets the DIOx output. For each bit: 0 – De-asserts the output (0 if polarity not inverted, 1 if inverted) 1 – Asserts the output (1 if polarity not-inverted, 0 if inverted) DIOINx (x=1,2) – Digital I/O Input Status Registers These two registers set the DIO input value. It will read the input value regardless of the setting on the direction (that is, it always reads the input). This reads the actual state of the DIO pin into the part.

24 Table 22: DIOIN1 – Digital I/O 8-1 Input Status Register Bits Identifier Access Default Description 7-0 IN_DIO[8:1] RO N/A Reads the DIO input status. For each bit: 0 – Input de-asserted if polarity not-inverted; asserted if polarity inverted 1 Input asserted if polarity not-inverted; de-asserted if polarity inverted Table 23: DIOIN2 – Digital I/O 16-9 Input Status Register Bits Identifier Access Default Description 7-0 IN_DIO[16:9] RO N/A Reads the DIO input status. For each bit: 0 – Input de-asserted if polarity not-inverted; asserted if polarity inverted 1 Input asserted if polarity not-inverted; de-asserted if polarity inverted DIOIMASKx (x=1,2) – Digital I/O Interrupt Mask Registers These two registers are the interrupt mask registers for the digital IOs. The reset type is Platform Reset because interrupts always have to be setup after exiting sleep states. Table 24: DIOIMASK1 – Digital I/O 8-1 Interrupt Mask Register Bits Identifier Access Default Description 7-0 IMASK_DIO[8:1] R/W 0 Digital I/O 8-1 interrupt mask. For each bit: 0 – Interrupt disabled 1 – Interrupt enabled Table 25: DIOIMASK2 – Digital I/O 16-9 Interrupt Mask Register Bits Identifier Access Default Description 7-0 IMASK_DIO[16:9] R/W 0 Digital I/O 16-9 interrupt mask. For each bit: 0 – Interrupt disabled 1 – Interrupt enabled DIOISTATx (x=1,2) – Digital I/O Interrupt Status Registers Table 26: DIOISTAT1 – Digital I/O 8-1 Interrupt Mask Register Bits Identifier Access Default Description 7-0 ISTAT_DIO[8:1] RW/C N/A DIOx interrupt status. A read returns the interrupt status. Writing a ‘1’ clears the interrupt status. This bit is set to a ‘1’ on a transition from low-to-high (POL_DIOx=0) or high-to-low (POL_DIOx=1).

25 Table 27: DIOISTAT2 – Digital I/O 16-9 Interrupt Mask Register Bits Identifier Access Default Description 7-0 ISTAT_DIO[16:9] RW/C N/A DIOx interrupt status. A read returns the interrupt status. Writing a ‘1’ clears the interrupt status. This bit is set to a ‘1’ on a transition from low-to-high (POL_DIOx=0) or high-to-low (POL_DIOx=1). DIOCR – Digital I/O Control Register One interrupt can be generated for the 16 digital I/Os. Reset type is Platform. Table 28: DIOCR – Digital I/O Control Register Bits Identifier Access Default Description 7 IRQEN R/W 0 DIO interrupt enable/disable: 0 – Interrupts disabled 1 – Interrupts enabled 6-4 IRQSEL(2:0) R/W 000 DIO interrupt IRQ select in LPC SERIRQ: 000 – IRQ3 001 – IRQ4 010 – IRQ5 011 – IRQ10 100 – IRQ6 101 – IRQ7 110 – IRQ9 111 – IRQ11 3-1 RESERVED RO 000 Reserved. Writes are ignored; reads always return 0. 0 TMREN R/W 0 Timer enable signals (used to switch digital I/Os to timer control signals): 0 – Timers disabled 1 – Timers enabled and some DIOs are used based on the TMRFULL setting in the Timer control register (TCR)

26 AUXDIR – AUX GPIO Direction Control Register This register controls the direction of the eight AUX GPIO signals. This reset depends on the state of the FPGA_PSEN signal. If FPGA_PSEN is a ‘0’ then the reset is the power-on and Platform Reset. If FPGA_PSEN is a ‘1’ then this register is only reset at power-on. Table 29: AUXDIR – AUX GPIO Direction Control Register Bit Identifier Access Default Description 7-0 DIR_GPIO[8:1] R/W 0 Sets the direction of the AUX GPIOx lines. For each bit: 0 – Input 1 – Output AUXPOL – AUX GPIO Polarity Control Register This register controls the polarity of the eight AUX GPIO signals. This reset depends on the state of the FPGA_PSEN signal.  If FPGA_PSEN is a ‘0’ then the reset is the power-on and Platform Reset.  If FPGA_PSEN is a ‘1’ then this register is only reset at power-on. Table 30: AUXPOL – AUX GPIO Polarity Control Register Bits Identifier Access Default Description 7-0 POL_GPIO[8:1] R/W 0 Sets the polarity of the AUX GPIOx lines. For each bit: 0 – No inversion 1 – Invert Note: This impacts the polarity as well as the interrupt status edge used. AUXOUT – AUX GPIO Output Control Register This register sets the AUX GPIO output value. This value will only set the actual output if the GPIO direction is set as an output. Reading this register does not return the actual input value of the GPIO (use the AUXIN register for that). As such, this register can actually be used to detect input/output conflicts. This reset depends on the state of the FPGA_PSEN signal.  If FPGA_PSEN is a ‘0’ then the reset is the power-on and Platform Reset.  If FPGA_PSEN is a ‘1’ then this register is only reset at power-on.

27 Table 31: AUXOUT – AUX GPIO Output Control Register Bits Identifier Access Default Description 7-0 OUT_GPIO[8:1] R/W 0 Sets the AUX GPIOx output values. For each bit: 0 – De-asserts the output (0 if polarity not-inverted, 1 if inverted) 1 – Asserts the output (1 if polarity not-inverted, 0 if inverted) AUXIN – AUX GPIO I/O Input Status Register This register sets the AUX GPIO input value. It will read the input value regardless of the setting on the direction (that is, it always reads the input). This reads the actual state of the GPIO pin into the part. Table 32: AUXIN – AUX GPIO Input Status Register Bits Identifier Access Default Description 7-0 IN_GPIOIO[8:1] RO N/A Reads the GPIOx input status. For each bit: 0 – Input de-asserted if polarity not-inverted; asserted if polarity inverted 1 Input asserted if polarity not-inverted; de-asserted if polarity inverted AUXIMASK – AUX GPIO Interrupt Mask Register This is the interrupt mask register for the AUX GPIOs and the interrupt enable selection. The reset type is Platform Reset because interrupts always have to be setup after exiting sleep states. Table 33: AUXICR – AUX GPIO Interrupt Mask Register Bits Identifier Access Default Description 7-0 IMASK_GPIO[8:1] R/W 0 GPIOx interrupt mask. For each bit: 0 – Interrupt disabled 1 – Interrupt enabled AUXISTAT – AUX GPIO I/O Interrupt Status Register Table 34: AUXISTAT – AUX GPIO Interrupt Status Register Bits Identifier Access Default Description 7-0 ISTAT_GPIO[8:1] RW/C N/A GPIOx interrupt status. A read returns the interrupt status. Writing a ‘1’ clears the interrupt status. This bit is set to a ‘1’ on a transition from low-to-high (POL_DIOx=0) or high-to-low (POL_DIOx=1).

28 AUXMODE1– AUX I/O Mode Register #1 These two registers select the mode on each AUX GPIO. This reset depends on the state of the FPGA_PSEN signal.  If FPGA_PSEN is a ‘0’ then the reset is the power-on and Platform Reset.  If FPGA_PSEN is a ‘1’ then this register is only reset at power-on. Table 35: AUXMODE1 – AUX I/O Mode Register Bit Identifier Access Default Description 7 MODE_GPIO8 R/W 0 GPIO8 mode. 0 – GPIO (I/O) 1 – ICTC3 (input) 6 MODE_GPIO7 R/W 0 GPIO7 mode. 0 – GPIO (I/O) 1 – ICTC4 (input) 5 MODE_GPIO6 R/W 0 GPIO6 mode. 0 – GPIO (I/O) 1 – OCTC3 (output) 4 MODE_GPIO5 R/W 0 GPIO5 mode. 0 – GPIO (I/O) 1 – OCTC4 (output) 3 MODE_GPIO4 R/W 0 GPIO4 mode. 0 – GPIO (I/O) 1 – WDOG_RESET# (output only). In this mode, the GPIO will be the FPGA watchdog timer trigger output that signals external equipment that the watchdog fired. The GPIO input status can still be read. Default is low-true. Setting GPIO polarity to ‘1’ makes it high-true. 2 MODE_GPIO3 R/W 0 GPIO3 mode. 0 – GPIO (I/O) 1 – WAKE# (input only). In this mode, the GPIO is passed through to the PCI_WAKE# signal. Default is low-true. Setting GPIO polarity to ‘1’ makes it high-true. The GPIO input status can still be read. 1 MODE_GPIO2 R/W 0 GPIO2 mode. 0 – GPIO (I/O) 1 – W_DISABLE# (input only). In this mode, the GPIO is passed through to the W_DISABLE# signal. The GPIO input status can still be read. Default is low-true. Setting GPIO polarity to ‘1’ makes it high-true. 0 MODE_GPIO1 R/W 0 GPIO1 mode. 0 – GPIO (I/O) 1 – SLEEP# (input only). This is the sleep signal on the baseboard power connector. It passes through the SLEEP# input on the CPU module. Default is low-true. Setting GPIO polarity to ‘1’ makes it high-true.

29 WDT_CTL – Watchdog Control Register Reset type is Platform. Table 36: WDT_CTL – Watchdog Control Register Bits Identifier Access Default Description 7 IRQEN R/W 0 Watchdog interrupt enable/disable: 0 – Interrupts disabled 1 – Interrupts enabled 6-4 IRQSEL(2:0) R/W 000 Watchdog interrupt IRQ select in LPC SERIRQ: 000 – IRQ3 001 – IRQ4 010 – IRQ5 011 – IRQ10 100 – IRQ6 101 – IRQ7 110 – IRQ9 111 – IRQ11 3 Reserved RO 0 Reserved. Writes are ignored; reads always return 0. 2 RESET_EN R/W 0 Enable the Watchdog to assert the push-button reset if it “fires”. 0 – Watchdog will not reset the board 1 – Board will be reset if the Watchdog “fires” 1 WDT_EN R/W 0 Watchdog Enable: 0 – Watchdog is disabled 1 – Watchdog is enabled Note: The WDT_VAL register must be set before enabling. 0 WDT_STAT RO 0 Watchdog Status: 0 – Watchdog disabled or watchdog has not “fired” 1 – Watchdog fired. Note: Once set to a ‘1’, it will remain so until any of the following occurs: • the WDT_VAL register is written to • the WDT_EN is disabled • a reset occurs

30 WDT_VAL – Watchdog Value Register This register sets the number of seconds for a Watchdog prior to enabling the watchdog. By writing this value, the watchdog can be prevented from “firing”. A watchdog fires whenever this registers value is all 0s, so it must be set to a non-zero value before enabling the watchdog to prevent an immediate “firing”. Reset type is Platform. The value written should always be 1 greater than the desired timeout value due to a 0-1 second “tick” error band (values written should range from 2-255 because a 1 could cause an immediate trigger); that is, the actual timeout is WDT_VAL seconds with a -1 second to 0 second error band. Table 37: WDT_VAL – Watchdog Control Register Bits Identifier Access Default Description 7-0 WDT_VAL(7:0) R/W 0x00 Number of seconds before the Watchdog fires. By default, it is set to zero which results in an immediate watchdog if WDT_EN is set to a ‘1’. XCVRMODE – COM Transceiver Mode Register Sets the RS232 vs RS422/485 mode on the COM port transceivers. These drive the UART_SEL signals from the FPGA to the transceivers. Reset type is Platform. Table 38: XCVRMODE – COM Transceiver Mode Register Bits Identifier Access Default Description 7-4 Reserved RO 0000 Reserved. Writes are ignored; reads always return 0. 3-2 Reserved RO 00 Reserved. Writes are ignored; reads always return 0. 3 COM4_MODE R/W 0 COM4 Transceiver mode: 0 – RS232 1 – RS422/485 2 COM3_MODE R/W 0 COM3 Transceiver mode: 0 – RS232 1 – RS422/485 1 COM2_MODE R/W 0 COM2 Transceiver mode: 0 – RS232 1 – RS422/485 0 COM1_MODE R/W 0 COM1 Transceiver mode: 0 – RS232 1 – RS422/485

31 AUXMODE2– AUX I/O Mode Register #2 This register defines the interrupt mapping for the AUX GPIOs. Reset type is Platform. Table 39: AUXMODE2 - AUX I/O Mode Register #2 Bits Identifier Access Default Description 7 IRQEN R/W 0 AUX GPIO interrupt enable/disable: 0 – Interrupts disabled 1 – Interrupts enabled 6-4 IRQSEL(2:0) R/W 000 AUX GPIO interrupt IRQ select in LPC SERIRQ: 000 – IRQ3 001 – IRQ4 010 – IRQ5 011 – IRQ10 100 – IRQ6 101 – IRQ7 110 – IRQ9 111 – IRQ11 3-0 Reserved RO 0000 Reserved. Writes are ignored; reads always return 0. FANCON – FAN CONTROL REGISTER The fan is always off in any sleep mode. When the processor comes out of sleep this register must be setup again since it will be reset to default by the platform reset signal. The fan is always turned “off” in sleep modes. On other products the FPGA controlled the fan and monitored fan speed. The FPGA on this products does that as well but the COM Module can also control the fan (either on/off or PWM) and monitor the fan speed. The FPGA currently only allows the fan to be turned on or off (no PWM since that requires interleaved fan-speed monitoring). This is the same case with the COM Module unless a 4-wire fan is used in which case the COM Module can use PWM fan-speed control and monitor fan speed. On all FPGA releases after DEV-0.02 (which only support the R1B PCB rev 0.20A or later) the fan tach signal is monitored by both the FPGA and COM Module all the time (COM_MODE does not impact this). The only purpose of COM_MODE is to select whether the COM Module or the FPGA controls the fan on/off (or PWM speed should that be used on the COM Module). Reset type is Reset.

32 Table 40: FANCON – Fan Control Register Bits Identifier Access Default Description 7 COM_MODE R/W 1 Selects the COM Module fan control instead of the FPGA. 0 – FPGA controls fan on/off. 1 – COM Module controls fan on/off (or PWM if used) . Note: COM Module will only operate with 4-wire fans if using PWM speed control. 3-wire fans are fine as long as it is just turned on or off. PWM speed can be used with either type fan but the fan-tach readings will not be stable on a 3-wire fan (but could possibly still be used to monitor if the fan is stuck or not). 6-1 RESERVED RO 0 Reserved – Writes are ignored. Reads always return 0 0 FAN_OFF R/W 0 Fan Disable: 0 – Fan is On 1 – Fan is Off Note: On is the default in case there is no software turning it on. This control only applies when COM_MODE is a ‘0’ (FPGA controls fan on/off). FANTACHLS, FANTACHMS – FANTACH STATUS REGISTERS The FPGA fan tach readings are always available and do not depend on either COM_MODE or the FAN_OFF settings. The number of fan tach output samples over a 1 second sampling period. The value is always valid after the fan speed stabilizes and is updated every 1 sec (after a delay of 1 sec). Currently only the lower 10-bits have a valid tach reading (i.e., the upper 6 bits will always be zero). The fan tach count should never overflow in the 1 second period but it if does the value will “stick” at 0x03FF. The design can handle up at least a 10,000 rpm fan with a fan tach output of up to 4 uniform pulses per revolution. The duty cycle of the fan tach output pulse can be as low as 25% (typically they are very close to 50%). The conversion to RPM is: RPM = (FANTACH x 60) / PPR Where, FANTACH - the 16-bit register reading PPR – fan tach pulses per revolution (typ either 1,2 or 4) Reset type: Not Applicable

33 Table 41: FANTACHLS – FANTACH Status Register LS Bits Bits Identifier Access Default Description 7-0 FANTACH[7:0] RO N/A LS 8-bits of FANTACH (read this first since it latches the value for the MS 8 bits) Table 42: FANTACHMS – FANTACH Status Register MS Bits Bits Identifier Access Default Description 7-0 FANTACH[15:8] RO N/A LS 8-bits of FANTACH (read this first since it latches the value for the MS 8 bits) Note: The FANTACHLS register must be read first. It will latch a copy of the MS bits so that when FANTACHMS is read it is based on the same 16-bit value. This assumes that a 16-bit word read on the LPC bus read the even (LS) address before the odd (MS) address.

34 UART1CR – UART1 Control Register (COM1) Reset type is Platform. Note: The BIOS (via ACPI) may modify this register when in an ACPI-capable operating system. The register can be read for status purposes but do not write to it unless you are using a non-ACPI operating system. Table 43: UART1CR – UART1 Control Register (COM1) Bits Identifier Access Default Description 7 IRQEN R/W 0 UART interrupt enable/disable: 0 – Interrupts disabled 1 – Interrupts enabled 6-4 IRQSEL(2:0) R/W 001 UART interrupt IRQ select in LPC SERIRQ: 000 – IRQ3 001 – IRQ4 [ COM1 Default] 010 – IRQ5 011 – IRQ10 100 – IRQ6 101 – IRQ7 110 – IRQ9 111 – IRQ11 3-0 UART1_BASE(3:0) R/W 0000 UART Base Address: 0000 - 3F8h [ COM1 Default] 0001 - 2F8h 0010 - 3E8h 0011 - 2E8h 0100 - 200h 0101 - 220h 0110 - 228h 0111 - 338h 1000 - 238h 1001 - 338h 1010-1111 [ These values are reserved; do not use.]

35 UART2CR – UART2 Control Register (COM2) Reset type is Platform. Table 44: UART2CR – UART2 Control Register (COM2) Bits Identifier Access Default Description 7 IRQEN R/W 0 UART interrupt enable/disable: 0 – Interrupts disabled 1 – Interrupts enabled 6-4 IRQSEL(2:0) R/W 000 UART interrupt IRQ select in LPC SERIRQ: 000 – IRQ3 [ COM2 Default] 001 – IRQ4 010 – IRQ5 011 – IRQ10 100 – IRQ6 101 – IRQ7 110 – IRQ9 111 – IRQ11 3-0 UART2_BASE(3:0) R/W 0001 UART Base Address: 0000 - 3F8h 0001 - 2F8h [ COM2 Default] 0010 - 3E8h 0011 - 2E8h 0100 - 200h 0101 - 208h 0110 - 220h 0111 - 228h 1000 - 238h 1001 - 338h 1010-1111 [ These values are reserved; do not use.]

36 UART3CR – UART3 Control Register (COM3) Reset type is Platform. Table 45: UART3CR – UART3 Control Register (COM3) Bits Identifier Access Default Description 7 IRQEN R/W 0 UART interrupt enable/disable: 0 – Interrupts disabled 1 – Interrupts enabled 6-4 IRQSEL(2:0) R/W 101 UART interrupt IRQ select in LPC SERIRQ: 000 – IRQ3 001 – IRQ4 010 – IRQ5 011 – IRQ10 100 – IRQ6 101 – IRQ7[ COM3 Default] 110 – IRQ9 111 – IRQ11 3-0 UART2_BASE(3:0) R/W 0010 UART Base Address: 0000 - 3F8h 0001 - 2F8h 0010 - 3E8h [ COM3 Default] 0011 - 2E8h 0100 - 200h 0101 - 208h 0110 - 220h 0111 - 228h 1000 - 238h 1001 - 338h 1010-1111 [ These values are reserved; do not use.]

37 UART4CR – UART4 Control Register (COM4) Reset type is Platform. Table 46: UART4CR – UART4 Control Register (COM4) Bits Identifier Access Default Description 7 IRQEN R/W 0 UART interrupt enable/disable: 0 – Interrupts disabled 1 – Interrupts enabled 6-4 IRQSEL(2:0) R/W 011 UART interrupt IRQ select in LPC SERIRQ: 000 – IRQ3 001 – IRQ4 010 – IRQ5 011 – IRQ10[ COM4 Default] 100 – IRQ6 101 – IRQ7 110 – IRQ9 111 – IRQ11 3-0 UART2_BASE(3:0) R/W 0011 UART Base Address: 0000 - 3F8h 0001 - 2F8h 0010 - 3E8h 0011 - 2E8h [ COM4 Default] 0100 - 200h 0101 - 208h 0110 - 220h 0111 - 228h 1000 - 238h 1001 - 338h 1010-1111 [ These values are reserved; do not use.]

38 UARTMODE1 – UART MODE REGISTER #1 When the COM Transceiver Mode is set to RS422/485 (in the XCVRMODE register) and the RS-485 Automatic Direction Control is enabled (e.g., UART1_485ADC set to ‘1’) then the transceiver Tx output is enabled. When there are bytes to transmit and the transceiver Tx output is disabled (i.e., tri-stated) when there are no bytes to transmit. When the COM Transceiver Mode is set to RS422/485 and Automatic Direction Control is disabled (e.g., UART1_485ADC set to ‘0’) then the UART is in Manual Direction Control mode and the transceiver Tx output enable is controlled by software using the RTS bit in the UART Modem Control Register. RTS = '0' - Transceiver Tx output is enabled. RTS = '1' - Transceiver Tx output is disabled (i.e., tri-stated). Warning: Terminal software, expecting an RS-232 port, may set RTS to '1' and disable the transmitter when initializing an RS-422/485 port in Manual Direction Control mode. Application software that handles the RS-422/485 port should set RTS to '0' to enable transmitting when in Manual Direction Control mode. Reset type is Platform.

39 Table 47: UARTMODE1 – UART MODE Register #1 Bits Identifier Access Default Description 7 UART4_485ADC R/W 0 COM4 RS-485 Automatic Direction Control: 0 – Disabled 1 – Enabled Note: Only enable in RS-485 mode. The COM4_MODE in XCVRMODE register must also be set to a ’1’ 6 UART3_485ADC R/W 0 COM3 RS-485 Automatic Direction Control: 0 – Disabled 1 – Enabled Note: Only enable in RS-485 mode. The COM3_MODE in XCVRMODE register must also be set to a ’1’ 5 UART2_485ADC R/W 0 COM2 RS-485 Automatic Direction Control: 0 – Disabled 1 – Enabled Note: Only enable in RS-485 mode. The COM2_MODE in XCVRMODE register must also be set to a ’1’ 4 UART1_485ADC R/W 0 COM1 RS-485 Automatic Direction Control: 0 – Disabled 1 – Enabled Note: Only enable in RS-485 mode. . The COM1_MODE in XCVRMODE register must also be set to a ’1’ 3 UART4_EN R/W 0 UART #4 Output Enable: 0 – Tx and RTS outputs are disabled 1 – Tx and RTS outputs are enabled Note: If disabled the UART I/O space is freed up. 2 UART3_EN R/W 0 UART #3 Output Enable: 0 – Tx and RTS outputs are disabled 1 – Tx and RTS outputs are enabled Note: If disabled the UART I/O space is freed up. 1 UART2_EN R/W 0 UART #2 Output Enable: 0 – Tx and RTS outputs are disabled 1 – Tx and RTS outputs are enabled Note: If disabled the UART I/O space is freed up. 0 UART1_EN R/W 0 UART #1 Output Enable: 0 – Tx and RTS outputs are disabled 1 – Tx and RTS outputs are enabled Note: If disabled the UART I/O space is freed up.

40 UARTMODE2 – UART MODE REGISTER #2 Standard software (the BIOS and the operating system) assumes the baud-rate clock is 1.8432 MHz and programs the divisors accordingly; however, a faster oscillator is needed for baud rates higher than 115,200. The FAST_MODE bit in this register shifts the divisor by 4 bits (multiply by 16) so that the legacy baud rate comes out correctly for the 16x UART clock. This bit must be set to use rates above 115,200 and may require custom software. Reset type is Platform. Note: The values shown are for the default BIOS configuration. Table 48: UARTMODE2 – UART MODE Register #2 Bits Identifier Access Default Description 7-1 Reserved RO 0000000 Reserved. Writes are ignored; reads always return 0. 0 FAST_MODE R/W 0 Sets how the baud-rate divisor for the 16550 UARTs are interpreted (applies to all ports): 0 – Divisor is multiplied by 16 (legacy mode for 1.8432 MHz clock) 1 – Divisor is not modified (fast mode for 16x 1.8432 MHz clock) Note: This must be set to ‘1’ to use baud rates above 115,200.

41 Programming Information for Hardware Interfaces Watchdog Timer A Watchdog timer is implemented within the FPGA. When triggered, the Watchdog timer can set a status bit, generate an interrupt and/or hit the push-button-reset. The Watchdog timer implements a 1-255 second timeout. The Watchdog time out is set in an 8-bit register (WDT_VAL). When the Watchdog is enabled, the WDT_VAL will start to count down. If the Watchdog is enabled and whenever WDT_VAL is zero, the Watchdog is triggered (so a non-zero value must be written before enabling the watchdog). Software must periodically write a non-zero value to WDT_VAL to prevent this trigger. The value written should always be 1 greater than the desired timeout value due to a 0-1 second error band. Values written should be from 2-255 because a 1 could cause an immediate trigger); that is, the actual timeout is WDT_VAL seconds with a -1 second to 0 second error band. The Watchdog control/status register(s) have bits for the following:  Watchdog enable/disable (disabled by default)  Watchdog timeout status (This is cleared when the Watchdog is disabled or when a new value is written to WDT_VAL. Writing WDT_VAL would be the interrupt-acknowledge.)  Watchdog interrupt IRQ select (from the same list of eight interrupts supported on the LPC SERIRQ)  Interrupt enable  Board reset enable (when set, the board will be reset when the Watchdog timer expires). Programmable LED User I/O connector J2 includes an output signal for attaching a software controlled LED. Connect the cathode of the LED to J2, pin 16; connect the anode to +3.3 V. An on-board resistor limits the current when the circuit is turned on. A programmable LED is provided on the CBR-4005B paddleboard. Refer to the VL-EPU-4562 Hardware Reference Manual for the location of the Programmable LED on the CBR-4005B paddleboard. To switch the PLED on and off, refer to Table 3: PCR – Product Code and LED Register, on page 8. 4

EPU-4562 Programmer’s Reference Manual 42 Processor WAKE# Capabilities The following devices can wake up the processor using the PCIE_WAKE# signal to the CPU module:  I210 Ethernet controller  Minicard #1 WAKE# signal  Minicard #2 WAKE# signal  FPGA via a secondary function on one of the 8x GPIOs The following USB devices can wake up the processor using the in-band SUSPEND protocol:  On-board USB 3.0 port  Any of the four USB Ports on the CBR-4005B paddleboard  Minicard #1 USB port  Minicard #2 USB port *** End of document ***