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DP83TC812EVM-MC: Inverted bits in IP address and MAC address of packets sent through EVM.

JEB
Prodigy 230 points
Part Number: DP83TC812EVM-MC

In two different setups, we are experiencing occasional bit inversions in the IP and MAC address of Ethernet packets sent through the EVM.  The connection is:

PC(100base-tx full)->EVM->EVM->100base-tx switch->ethernet device.  Here is a wireshark capture showing the type of problems we see:

I have followed instructions in the EVM manual, I can connect the USB2MDIO tool and set this register as indicated and read it back:

Do you know how to deal with the occasional bit inversions?

  • 0
    TI__Mastermind 26632 points

    Hi Jeb, 

    A few clarifying questions: Where are you capturing the wireshark images, PC side or Ethernet Device side? Do you have any other setups that are working without issues? Do you have any other copies of the EVM that you could try swapping out?

    Lastly, can you do a sanity check by removing the 2 EVM's and seeing if the issue disappears?

    Thanks,

    David

  • 0 in reply to David Creger
    Prodigy 230 points

    We resolved this by increasing the amount of delay by writing 0x0037 instead of 0x0027 to register address 0x0086 to PHY addr 0x0001.  We were capturing the Wireshark on the PC side.