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DP83867E: Question of IDLE ERROR COUNTER

Lee, Sam
Expert 6145 points
Part Number: DP83867E


Hi team,

What does IDLE ERROR COUNTER (Address=0x000A[7:0]) in DP83867mean? Does the counter work when link is down?

-. Is it related to MDI issue (between RJ45 and PHY), or MII issue (between PHY and SoC)? Otherwise, both?

-. At a test for link down in MDI line, it seems that the error is not recognized. Is it normal behavior?

Thanks,

Best Regards,

Sam Lee

  • 0
    TI__Mastermind 19780 points
    Hi Sam,

    It is related to idle symbols on the MDI. The MDI needs to be connected to the link partner, and link must be active, before idle symbols are exchanged.

    When you disconnect a link, you should get burst of idle errors. The idle error count should be clear on read, but the DP83867 doesn't latch the count properly. A read immediately after the disconnect event should show idle errors.

    Best Regards,