SPRUJA9A January   2024  – October 2024

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1.     Preface: Read This First
      1. 1.1.1 Sitara MCU+ Academy
      2. 1.1.2 If You Need Assistance
    2. 1.1 Introduction
    3. 1.2 Kit Contents
    4. 1.3 Device Information
  6. 2Hardware
    1. 2.1 Component Identification
    2. 2.2 Power Requirements
      1. 2.2.1 Power Tree
    3. 2.3 Functional Block Diagram
    4. 2.4 Header Information
    5. 2.5 Test Points
    6. 2.6 Interfaces
      1. 2.6.1 Automotive Ethernet PHY
      2. 2.6.2 Automotive Ethernet PHY Strapping Resistors
      3. 2.6.3 Multi-Connector Addressing
    7. 2.7 Integration Guide
      1. 2.7.1 Board Dimensions
      2. 2.7.2 DF40GB Connector
      3. 2.7.3 Mounting Holes
      4. 2.7.4 MATEnet Ethernet Connector
  7. 3Hardware Design Files
  8. 4Additional Information
    1. 4.1 Trademarks
  9. 5References
    1. 5.1 Reference Documents
    2. 5.2 Compatible Sitara™ MCU AM2x EVMs
    3. 5.3 Other TI Components Used in This Design
  10. 6Revision History

2.6.3 Multi-Connector Addressing

For Sitara AM2x EVMs with more than one Ethernet add-on board connector, each DP83TG720-EVM-AM2 requires a different EEPROM I2C address and PHY address. The EEPROM A0 and A2 nets, set by pull resistors on the main Sitara AM2x EVM drive the PHY address nets via a FET network implemented on the DP83TG720-EVM-AM2. Table 2-6 details the multi-connector I2C and PHY addressing scheme implemented on the add-on PHY board.

Note:
  • The EEPROM I2C address bits A2 and A0 are driven via pull resistors on the main Sitara AM2x EVM. The pull resistors for each enumerated connector follow the table below.
  • EEPROM I2C address bit A1 will always be pulled high to VDDIO on the add-on board
  • The EEPROM I2C address is defined by the following 8 bits: 8b1010[A2][A1][A0][R/W]
  • Pulls to VDDIO/GND are via 10kOhm resistor
  • All EVMs with a single connector are configured as CONNECTOR_0

Table 2-6 Multi-Connector I2C / PHY Addressing Scheme
Connector_# EEPROM_A2 (connector pin 37) EEPROM_A1 EEPROM_A0 (connector pin 47) I2C Address DP83TG720 PHY Address
Pull A2 Pull A1 Pull A0
CONNECTOR_0 GND 0 VDDIO 1 GND 0 0x52 4b1111
CONNECTOR_1 GND 0 VDDIO 1 VDDIO 1 0x53 4b1010
CONNECTOR_2 VDDIO 1 VDDIO 1 GND 0 0x56 4b0101
CONNECTOR_3 VDDIO 1 VDDIO 1 VDDIO 1 0x57 4b0000