SNLA438 September   2023 DP83822H , DP83822HF , DP83822I , DP83822IF , DP83826E , DP83826I , DP83867CS , DP83867E , DP83867IS , DP83869HM

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2PROFINET Specification Requirements
  6. 3Ethernet PHY Setup
    1. 3.1 DP83822
      1. 3.1.1 DP83822 Hardware Bootstrap Configurations
      2. 3.1.2 DP83822 Register Configuration
    2. 3.2 DP83826
      1. 3.2.1 DP83826 Hardware Bootstrap Configuration
      2. 3.2.2 DP83826 Register Configuration
    3. 3.3 DP83867
      1. 3.3.1 DP83867 Hardware Bootstrap Configurations
      2. 3.3.2 DP83867 Register Configuration
    4. 3.4 DP83869
      1. 3.4.1 DP83869 Hardware Bootstrap Configurations
      2. 3.4.2 DP83869 Register Configuration
  7. 4Summary
  8. 5References

3.2.2 DP83826 Register Configuration

If hardware bootstraps are not sufficient, our Ethernet PHYs can be configured via Register Writes, which can change the PHYs mode, regardless of how the Bootstraps are configured.

Table 3-5 DP83826 Software Configuration
Register Address Write Value Remarks
0000 3100 Auto-negotiation enabled, Full Duplex Mode. For Forced 100Mbps write 2100
0004 0101 De-advertise 10Base-T and Half Duplex modes
000B 000F

FLD Enabled

Last nibble F sets Fast Link Drop Functionality

Details can be found in Data Sheet, search for "Offset = Bh"
0017 0041 This is the default state, Enable MII mode of Operation. For RMII, write 0061
0019 8000 This is the default state, Auto MDI/X enable. For forced MDI or MDIX, write 0000 or 4000 respectively
001F 4000 Soft Reset PHY