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

3.4.2 DP83869 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.

As mentioned in the bootstrap section, the DP83869 cannot be configured into MII mode with Bootstraps alone, register writes are required.

Table 3-12 DP83869 RGMII Software Configuration
Register Address Write Value Remarks
01DF See Remark

OP_MODE_DECODE:

RGMII to Copper write: 0000

RGMII to 1000Base-X: 0001

RGMII to 100Base-FX: 0002
0000 1140

Auto-negotiation enabled,

Full Duplex Mode,

For Forced 100Mbps write 2100

For Forced 1000Mbps write 2140, Note: Not recommended
0004 0101

De-advertise 10Base-T and Half Duplex 100Base-Tx

0009 0200 De-advertise Half-Duplex for 1000Base-T
0010 5048

Auto MDI-X enable

002D 801F

FLD Enable

Last nibble 'F' sets Fast Link Drop Functionality

Details can be found in Data Sheet, search for "Offset = 2Dh"
001F 4000 Soft Reset PHY
Table 3-13 DP83869 MII Software Configuration
Register Address Write Value Remarks
01DF See Remark

OP_MODE_DECODE:

MII to Copper write: 0060

MII to Fiber write: 0062
0000 1140

Auto-negotiation enabled,

Full Duplex Mode,

For Forced 100Mbps write 2100
0004 0101

De-advertise 10Base-T and Half Duplex 100Base-Tx
0009 0000 De-advertise 1000Base-T
0010 5048

Auto MDI-X enable

0018 000E Required for MII Operation.
001F 4000 Soft Reset PHY