SNLA487 May   2025 DP83826AE , DP83826AI

 

  1.   1
  2.   KSZ8081MNX/RNB to DP83826A System Rollover
  3.   Trademarks
  4. 1Purpose
  5. 2Required Changes
    1. 2.1 Strap Resistor Value
    2. 2.2 External Capacitor on Pin 2
    3. 2.3 Duplex Strap on Pin 16 (DP83826A Basic Mode)
    4. 2.4 Selecting 10M with Auto-Negotiation Enabled (DP83826A Basic Mode)
    5. 2.5 Configuring LED_1 for Tx and Rx Activity for EtherCAT Slave (DP83826A Basic Mode)
    6. 2.6 Thermal Pad Adjustments in Layout
    7. 2.7 Physical Layer ID Register
  6. 3Potential Changes
    1. 3.1 MDIO Pull-Up Resistor on Pin 11
    2. 3.2 MDIO Register Writes
    3. 3.3 Capacitors on Center Tap of Magnetics
  7. 4Informational Changes
  8. 5Pinout Mapping
    1. 5.1 Pin Mapping
  9. 6DP83826A Strap Configurations
    1. 6.1 Bootstrap Configurations

2.5 Configuring LED_1 for Tx and Rx Activity for EtherCAT Slave (DP83826A Basic Mode)

The DP83826A and KSZ8081MNX/RNB can use LED_1 to indicate Tx and Rx activity from a host ASIC or FPGA. Extended register configurations are required for DP83826A.

  • Program register 0x0460 either with 0x0001 for the LED to stay high or with 0x0008 for a blinking LED
  • Program register 0x0469 with 0x0004