SPRUJG5 January   2025

 

  1.   1
  2.   Description
  3.   Features
  4.   4
  5. 1Evaluation Module Overview
    1.     Preface: Read This First
      1. 1.1.1 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 Ethernet Interface
        1. 2.6.1.1 Industrial Ethernet PHY
        2. 2.6.1.2 Industrial Ethernet PHY Strapping Resistors
        3. 2.6.1.3 LED Indication in RJ45 Connector
        4. 2.6.1.4 Multi-Connector Addressing
    7. 2.7 Integration Guide
      1. 2.7.1 Board Dimensions
      2. 2.7.2 Installation
  7. 3Hardware Design Files
  8. 4Additional Information
    1. 4.1 Trademarks
  9. 5References
    1. 5.1 Reference Documents
  10. 6Revision History

2.6.1.4 Multi-Connector Addressing

For AMx EVMs with more than one Ethernet add-on board connector, each DP83867-EVM-AM requires a different EEPROM I2C address and PHY address. The EEPROM A0 and A2 nets, set by pull resistors on the main EVM drive the PHY address nets via a FET network implemented on the DP83867-EVM-AM. Table 2-5 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 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 2-5 Multi-Connector I2C / PHY Addressing Scheme
Connector_#EEPROM_A2 (connector pin 37)EEPROM_A1EEPROM_A0 (connector pin 47)I2C AddressDP83867 PHY Address
PullA2PullA1PullA0
CONNECTOR_0GND0VDDIO1GND00x525b00000
CONNECTOR_1GND0VDDIO1VDDIO10x535b00001
CONNECTOR_2VDDIO1VDDIO1GND00x565b00100
CONNECTOR_3VDDIO1VDDIO1VDDIO10x575b00101