SPRUJ68 January   2023 AM68

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Inside the Box
    2. 1.2 Key Features and Interfaces
    3. 1.3 Thermal Compliance
    4. 1.4 EMC, DMI, and ESD Compliance
  4. 2User Interfaces
    1. 2.1 Power Input
      1. 2.1.1 Power Input [J22] With LED for Status [LD2]
      2. 2.1.2 Power Budget Considerations
    2. 2.2 User Inputs
      1. 2.2.1 Board Configuration Settings [SW1]
      2. 2.2.2 Reset Power Down Pushbutton [SW2]
      3. 2.2.3 User Pushbutton [SW3] With User LED Indication [LD3]
    3. 2.3 Standard Interfaces
      1. 2.3.1 Uart-Over-USB [J4 With LED for Status [LD1]
      2. 2.3.2 Gigabit Ethernet [J8] With Integrated LEDs for Status
      3. 2.3.3 JTAG Emulation Interface [J13]
      4. 2.3.4 USB3 1 Gen1 Interfaces [J9] [J11]
      5. 2.3.5 Stacked DisplayPort and HDMI Type A [J12]
      6. 2.3.6 M 2 Key M Connector [J21] for SSD Modules
      7. 2.3.7 MicroSD Card Cage [J19]
    4. 2.4 Expansion Interfaces
      1. 2.4.1 Heatsink [ACC1] With [J15] Fan Header
      2. 2.4.2 CAN-FD Connector(s) [J1] [J2] [J5] [J6]
      3. 2.4.3 Expansion Header [J3]
      4. 2.4.4 Camera Interface 22-Pin Flex Connectors [J16][J17]
      5. 2.4.5 Camera Interface 40-Pin High Speed [J20]
      6. 2.4.6 Automation and Control Connector [J24]
  5. 3Circuit Details
    1. 3.1 Top Level Diagram
    2. 3.2 AM68 SK EVM Interface Mapping
    3. 3.3 I2C Address Mapping
    4. 3.4 GPIO Mapping
    5. 3.5 I2C GPIO Expander Table
    6. 3.6 Identification EEPROM
  6. 4Revision History

3.5 I2C GPIO Expander Table

The EVM uses I2C-based IO expander(s) for some peripheral controls. The below table explains the functionality of the pins.

Table 3-4 I2C GPIO Mapping Table
PORT NO Net name Function

Dir/

Level

 Remarks
I2C Bus: I2C0, 0x21 (TCA6416A)
P05 BOARDID_EEPROM_WP EEPROM Write Protect Output

‘0’ – EEPROM is NOT Write

Protected (default)

‘1’ – EEPROM is Write Protected
P06 CAN_STB CAN Standby signal Output

‘0’ – Normal Mode

‘1’ – Standby Mode (default)
P10 GPIO_uSD_PWR_EN SD Card Power Enable Output

‘0’ – SD Card Power Disabled

‘1’ – SD Card Power Enable

(default)
P12 IO_EXP_PCIe1_M.2_RTSz

M.2 Key M Interface Signal

(RSTz)

 Output

RSTz, See M.2 Key M specification

for more details. (Default = ‘0’)
P13 IO_EXP_MCU_RGMII_RST# Ethernet PHY Reset Output

‘0’ – Ethernet is Reset

‘1’ – Ethernet is NOT Reset

(default)
I2C Bus: I2C1, 0x20 (TCA6408A)
P0

CSI_VIO_SEL

CSI I2C/GPIO Voltage

Selection

 Output

‘0’ – 1.8 V IO (default)

‘1’ – 3.3 V IO
P1 CSI_SEL_FPC_EXPn

CSI Expansion Interface

Selection

 Output

CSI I2C MUX select

‘0’ – Camera/Flex Selected

(default)

‘1’ – 40-pin Camera Expansion

Selected
P2 IO_EXP_CSI2_EXP_RSTz

CSI Expansion Signal

(RESETz)

 Output

‘0’ – CSI Board is Reset (Default)

‘1’ – CSI Board is NOT Reset
P3 CSI0_B_GPIO1

Camera #0 Flex Signal

(PwrDwn)

 Output

Camera Specific

‘0’ – Normal Operation (default)

‘1’ – Power Down
P4 CSI1_B_GPIO1

Camera #1 Flex Signal

(PwrDwn)

 Output

Camera Specific

‘0’ – Normal Operation (default)

‘1’ – Power Down
I2C Bus: MCU_I2C1, 0x20 (TCA6408A)
P0 HDMI_PDn HDMI Transceiver Enable Output

‘0’ – Power Down (default)

‘1’ – Normal Operation
P1 HDMI_LS_OE HDMI Monitor Enable Output

‘0’ – Power Down

‘1’ – Normal Operation (default)
P2 DP0_3V3 _EN Display Port Monitor Enable Output

‘0’ – Monitor is Disabled (default)

‘1’ – Monitor is Enabled
P3 eDP_ENABLE DSI to eDP bridge Enable Output

‘1’ – Bridge is Enabled(default)

‘0’ – Bridge is Disabled

Note: In the DIR column, output is to the test automation module, input is from the test automation module. Bi-Dir signals can be configured as either input or output.