SPRUJ64 September   2022

 

  1.   Abstract
  2.   Trademarks
  3. 1Key Features
  4. 2AM64x SKEVM Overview
    1. 2.1 Board Version Identification
  5. 3Functional Block Diagram
  6. 4System Description
    1. 4.1  Clocking
      1. 4.1.1 Ethernet PHY Clock
      2. 4.1.2 AM64x SoC Clock
    2. 4.2  Reset
    3. 4.3  Power Requirements
      1. 4.3.1 Power Input
      2. 4.3.2 USB Type-C Interface for Power Input
      3. 4.3.3 Power Fault Indication
      4. 4.3.4 Power Supply
      5. 4.3.5 Power Sequencing
      6. 4.3.6 SOC Power
    4. 4.4  Configuration
      1. 4.4.1 Boot Modes
    5. 4.5  JTAG
    6. 4.6  Test Automation
    7. 4.7  UART Interface
    8. 4.8  Memory Interfaces
      1. 4.8.1 LPDDR4 Interface
      2. 4.8.2 MMC Interface
        1. 4.8.2.1 Micro SD Interface
        2. 4.8.2.2 WiLink Interface
        3. 4.8.2.3 OSPI Interface
        4. 4.8.2.4 Board ID EEPROM Interface
    9. 4.9  Ethernet Interface
      1. 4.9.1 DP83867 PHY Default Configuration
      2. 4.9.2 DP83867 – Power, Clock, Reset, Interrupt, and LEDs
      3. 4.9.3 Industrial Application LEDs for Indication
    10. 4.10 USB 3.0 Interface
    11. 4.11 PRU Connector
    12. 4.12 User Expansion Connector
    13. 4.13 MCU Connector
    14. 4.14 Interrupt
    15. 4.15 I2C Interface
    16. 4.16 IO Expander (GPIOs)
  7. 5Known Issues and Modifications
    1. 5.1 Issue 1 - Silkscreen Missprint on Initial Board Batch
  8. 6Revision History

4.11 PRU Connector

PRU header offers low speed connection to the PRG0 interface. PRU_ICSSG signals from a PRG0 port (PRG0_PRU0 and PRG0_PRU1) are terminated on the PRU expansion connector. PRU0 signals are connected to a 27x2 standard 0.1” spaced 54-pin connector. The connector contains MDIO control signals (2 pins), PRG0_PRU0_GPO [0: 19], PRG0_PRU1_GPO [0: 17], +3.3V PWR (2 pins) and Ground reference (5 pins), DETECT, RESET, INT going to the daughter card and SoC I2C0 lines (2 pins). 3.3 V are current limited to 200 mA. This is achieved by using load switch TPS22902YFPR. Enable for the load switch is controlled by the SoC.

Signals routed from the PRU connector are listed in Table 4-20

Table 4-20 Selection of PRG0 Signals on PRU Connector
Pin Net Name Pin Net Name
1 VCC3V3_PRU 2 DGND
3 PRU_DETECT 4 PRU_RESETz
5 PRU_INTn 6 SoC_I2C0_SCL
7 PRG0_PRU0GPO16 8 SoC_I2C0_SDA
9 PRG0_MDIO0_MDC 10 NC
11 PRG0_MDIO0_MDIO 12 NC
13 PRG0_PRU0GPO0 14 PRG0_PRU0GPO1
15 PRG0_PRU0GPO2 16 PRG0_PRU0GPO3
17 PRG0_PRU0GPO4 18 PRG0_PRU0GPO5
19 PRG0_PRU0GPO6 20 PRG0_PRU0GPO7
21 PRG0_PRU0GPO8 22 PRG0_PRU0GPO9
23 PRG0_PRU0GPO10 24 PRG0_PRU0GPO11
25 PRG0_PRU0GPO12 26 PRG0_PRU0GPO13
27 PRG0_PRU0GPO14 28 PRG0_PRU0GPO15
29 DGND 30 PRG0_PRU0GPO17
31 PRG0_PRU0GPO18 32 PRG0_PRU0GPO19
33 DGND 34 DGND
35 PRG0_PRU1GPO0 36 PRG0_PRU1GPO1
37 PRG0_PRU1GPO2 38 PRG0_PRU1GPO3
39 PRG0_PRU1GPO4 40 PRG0_PRU1GPO5
41 PRG0_PRU1GPO6 42 PRG0_PRU1GPO7
43 PRG0_PRU1GPO8 44 PRG0_PRU1GPO9
45 PRG0_PRU1GPO10 46 PRG0_PRU1GPO11
47 PRG0_PRU1GPO12 48 PRG0_PRU1GPO13
49 PRG0_PRU1GPO14 50 PRG0_PRU1GPO15
51 PRG0_PRU1GPO16 52 PRG0_PRU1GPO17
53 DGND 54 VCC3V3_PRU
GUID-EE8E526E-CEBA-4CD3-948E-CEC27CFBD036-low.png Figure 4-18 54-Pin PRU Connector