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

4.8.2.2 WiLink Interface

The SKEVM board has WiLink Module (WL1837MODGIMOCT) from TI connected to the MMC0 port of the AM64x SoC. The WL1837MOD is a Wi-Fi, dual-band, 2.4- and 5-GHz module solution with two antennas supporting Industrial temperature grade. The Module is connected to 4-bit IO of the MMC0 interface supporting IEEE standard 802.11a/b/g/n data rates with 20 or 40-MHz SISO or 20-MHz MIMO. The Module offers high throughput and extended range along with Wi-Fi and Bluetooth coexistence in a power-optimized design.

The device supports the following Bluetooth features:

  • Bluetooth 4.2 secure connection as well as CSA2
  • Concurrent operation and built-in coexisting and prioritization handling of Bluetooth and Bluetooth low energy wireless technology, audio processing, and WLAN
  • Dedicated audio processor supporting on-chip SBC encoding + A2DP
  • Assisted A2DP (A3DP): SBC encoding implemented internally
  • Assisted WB-speech (AWBS): modified SBC codec implemented internally. Figure 4-10 shows the block diagram of Wilink module interfaced with AM64x.

SKEVM does not support A2DP BT Audio profile or HF profile.

The Module requires two power supplies, 3.3 V for VBAT_IN and 1.8 V for VIO_IN. The MMC0 interface of SOC is powered by VDDSHV_MMC0 power supply, which is connected to 1.8-V IO supply. Bluetooth UART signals, enable of BT and WLAN and WLAN_IRQ signals are connected to GPIO’s of AM64x using level translator (SN74AVC4T245RSVR). Input clock is provided by using 32.768 KHz oscillator (ASDK2-32.768KHZ-LRT).

Test points are provided on MMC0_DAT [4:7] pins of SOC and WL_GPIO, BT_UART_DEBUG, WL_UART_DEBUG pins on WL1837 Module.

A 14-pin Wilink connector is also provided. An external Wi-Fi module (Bluetooth module is not supported) can be communicated with SoC through the 14-pin WiLink connector. By default, the 14-pin Wilink connector and 0E resistors are not populated on the signals which are connected to the 14-pin Wilink connector.

GUID-70B32454-0F14-47E6-A827-CFCFD9876EE7-low.png Figure 4-10 WiLink Module Interface