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TM4C129X ethernet not working

Arun Sharma19
Prodigy 220 points

Hi, we are using internal ethernet PHY of TM4C129X controller and trying to bring the Ethernet up. its configured for 100 Mbps Ethernet. code is working on the DK-TM4C129x but not working on the custom board developed by us.

Hardware design is similar to DK except that we are using RJ45 connector with LED. When i probed the ethernet TX+, TX- signals at the transformer input, I just see 3.3V signal with some noise and no data signals. 

I checked layout and values of Rbias (4.87K) and everything looks good.

One difference between DK and our board is DK has XM4C129X and our board has TM4C129X which is the released version.

Can somebody help?

  • 0
    TI__Guru**** 244400 points
    Hello Arun,

    That should not be the problem. Can you check for the following

    1. Is the crystal a 25MHz crystal?
    2. Is the MAC address programmed in the USERCONFIG0 and 1 registers as expected by the Ethernet Stack?
    3. What are the changes to the SW for custom board?

    Regards
    Amit