SNLA443 December   2023 DP83869HM

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1DP83869 Application Overview
  5. 2Troubleshooting the Application
    1. 2.1 Configuring Correct Operational Mode
    2. 2.2 Schematic and Layout Checklist
    3. 2.3 Component Checklist
    4. 2.4 Peripheral Pin Checks
      1. 2.4.1 Power Supplies
      2. 2.4.2 RBIAS Voltage and Resistance
      3. 2.4.3 Probe the XI Clock
      4. 2.4.4 Probe the RESET_N Signal
      5. 2.4.5 Probe the Strap Pins During Initialization
      6. 2.4.6 Probe the Serial Management Interface Signals (MDC, MDIO)
      7. 2.4.7 Probe the MDI Signals
    5. 2.5 Built-In Self Test with Various Loopback Modes
    6. 2.6 Debugging MAC Interface
      1. 2.6.1 RGMII
      2. 2.6.2 SGMII
  6. 3Operational Mode Clarification
    1. 3.1 Bridge Modes
    2. 3.2 Fiber Configuration
      1. 3.2.1 Fiber Registers
  7. 4Tools and References
    1. 4.1 DP83869HM Register Access
    2. 4.2 Extended Register Access
      1. 4.2.1 Read (No Post Increment) Operation
      2. 4.2.2 Write (No Post Increment) Operation
    3. 4.3 Software and Driver Debug on Linux
      1. 4.3.1 Common Terminal Outputs
  8. 5Summary
  9. 6References

3.1 Bridge Modes

The DP83869HM supports two types of Bridge Modes to translate data between two MAC interface types. The two types are:

  • RGMII-to-SGMII mode
  • SGMII-to-RGMII mode

The naming convention implies MAC-to-PHY and the functionality of the DP83869HM changes depending on which mode is selected. More information can be found in the Bridge Modes section of the data sheet.

GUID-1B50235D-14DB-4B9E-9E12-A90F9B97AB8C-low.gif Figure 3-1 DP83869HM RGMII-to-SGMII Bridge
GUID-A36605D7-5E28-4824-B408-284DF11F204C-low.gif Figure 3-2 DP83869HM SGMII-to-RGMII Bridge