SNLA423 March   2023 DP83826E

 

  1. 1Trademarks
  2. 2DP83826 Application Overview
  3. 3Troubleshooting the Application
    1. 3.1 Read and Check Register Values
    2. 3.2 Schematic and Layout Checklist
    3. 3.3 Component Checklist
    4. 3.4 Peripheral Pin Checks
      1. 3.4.1 Power Supplies
      2. 3.4.2 Probe the XI Clock
      3. 3.4.3 Probe the RESET_N Signal
      4. 3.4.4 Probe the Strap Pins During Initialization
      5. 3.4.5 Probe the Serial Management Interface Signals (MDC, MDIO)
      6. 3.4.6 Probe the MDI Signals
    5. 3.5 Link Quality Check
    6. 3.6 Built-In Self Test with Various Loopback Modes
    7. 3.7 Debugging MAC Interface
    8. 3.8 Tools and References
      1. 3.8.1 DP83826 Register Access
      2. 3.8.2 Extended Register Access
      3. 3.8.3 Application Note References
  4. 4Conclusion
  5. 5Revision History

3.4.4 Probe the Strap Pins During Initialization

In some cases, other devices on the board (for example, the MAC) will pull or drive these pins unexpectedly. The strap values can be read from the registers. The values are available in register 0x006E (STRAP_STS1) and register 0x006F (STRAP_STS2). If you're still not sure about the PHY's Strapping, confirm that these signals are in the range of the target voltages described in Table 9-6 found in the Programming section of the datasheet. Measurements can be made during power up and after power up when the RESET_N signal is asserted.