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DP83822EVM: Does see UDP traffic from PHY?

Stanley Cao
Prodigy 110 points
Part Number: DP83822EVM

Hi team,

I would like to know if this setup will work, I am prototyping the DP83822EVM to NXP TJA1100 100Base-T1 PHY configuration.

MII/RMII PHY back-to-back connections.

Scenario 2 is working, I have seen traffic between two computers via Wireshark and ping successful.

Scenario 1 doesn't work, what is missing?

Thanks,

  • 0
    TI__Mastermind 26320 points
    Hi,

    I am not able to identify the difference in connection between DP83822 and TJA1100 between two scenarios. As per diagram, both are connected in MII back-2-back connection. Can you please explain the differnce ?

    Regards,
    Geet
  • 0 in reply to Geet Modi
    Prodigy 110 points

    Hi Geet,

    Thanks for your respond.

    In scenario 1 the unit connecting directly to MDI (2-wires).

    In scenario 2 the unit replaced by a computer for troubleshoot purpose, to see if the setup can communicate with each other, which it does communicating.

    The known good unit is working for sure, I have verify by connecting the unit via MDI->RJ45 to computer directly, and I have seen UDP Packet is coming but thru MII back to back, it doesn't work.

    I got no clues what is going on.

    Regards,

    Stanley

  • 0 in reply to Stanley Cao
    TI__Mastermind 26320 points
    Hi,

    Can you use RMII instead of MII for back-2-back ? You can provide 50Mhz from Oscillator to both Phys.

    In MII both the clocks are provided by both Phy and expect the data recieved from the other side synchronised.

    Regards,
    Geet
  • 0 in reply to Geet Modi
    Prodigy 110 points

    Thanks Geet.

    It is working now with Reverse MII back-to-back on Phy.

    Thanks,

    Stanley