SNLA452 August   2025 DP83TD510E

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Troubleshooting the Application
    1. 2.1 Schematic and Layout Checklist
    2. 2.2 Component Checklist
    3. 2.3 Device Health Checks
      1. 2.3.1 Check Voltage Supply Pins
      2. 2.3.2 Probe the RST_N Pin
      3. 2.3.3 Probe the CLKOUT Pin
      4. 2.3.4 Probe the SMI Pins
    4. 2.4 Read and Check Register Values
    5. 2.5 Verifying Strap Configuration
    6. 2.6 Loopbacks
    7. 2.7 MDI Health Checks
      1. 2.7.1 Link Up Common Issues
      2. 2.7.2 Transmit Level
        1. 2.7.2.1 Change Transmit Level
      3. 2.7.3 Time-Domain Reflectometry
      4. 2.7.4 Signal Quality Check
      5. 2.7.5 MDI Test Modes
    8. 2.8 MII Health Checks
      1. 2.8.1 RGMII
      2. 2.8.2 RMII
      3. 2.8.3 MII
  6. 3Summary
  7. 4References

2 Troubleshooting the Application

The following sections approach debugging the application from a high level, starting with application characteristics that have a broad impact before zeroing in on more focused aspects of the design.

This application note is laid out in three major sections:

Depending on the particular behavior observed, all three of these sections are possibly not needed. Because of this, certain sections can be skipped if the correct behavior is observed. The comment is mentioned at the start of each section, as well as given in the following.

Device Health Checks section can be skipped if the device

  • Linking up (Status read through register 0x0010) when connected to link partner OR showing NLP signals when Ethernet cable is unconnected
  • Responding as expected to register access

MDI Health Checks section can be skipped if the device

  • Linked up AND reporting no packet errors via register 0x0015 when sending traffic through the device

There are several register settings discussed in this app note. For ease of access, we have included some debug scripts in this application note. These can be used with the tool USB-2-MDIO to reprogram the DP83TD510E into different modes. A collection of all the scripts mentioned here, and more, can also be found on the product page.