DP83867IS: Debugging SGMII Interface with T1042 Processor and Testing MII Internal Loopback on DP83867IS PHY

Tool/software:

I am working with a T1042 processor. There is a TI phy dp83867is connected to the SerDes module of T1042 processor . However, the SGMII interface is not functioning as expected. I need assistance in debugging this issue and would appreciate guidance on the following:

1. SGMII Debugging:

   • What are the key steps to debug the SGMII interface between the T1042 processor and the DP83867IS PHY?
   • Are there specific SerDes or PHY register settings I should verify to ensure correct configuration?
   • How can I confirm whether the link negotiation is working properly at the SGMII level?
   • Are there recommended methods to test and validate data flow through the SGMII interface?

2. MII Internal Loopback Testing:

   • Could you provide a detailed procedure to enable and test the MII internal loopback on the DP83867IS PHY?
   • Which registers need to be configured, and what are the expected results when the loopback is functioning correctly?

Any insights, register configuration examples, or troubleshooting tips would be greatly appreciated.

Thank you!