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TUSB8042A: TUSB8042A USB compliance test fail downstream Rx test

user3668508
Prodigy 180 points
Part Number: TUSB8042A

Dear Team,

The TUSB8042A's USB compliance test fails the downstream receiver test.

It seems that I haven't switched to loopback mode.

Is there a procedure to enter to loopback mode?

Thanks

  • 0
    TI__Guru 60870 points

    Hi,

    Do you have the upstream port of the hub connected to a host with USB 3.0 enabled?  Can you confirm that the host is not resetting the hub ports when they enter loopback mode?

    Are you running short or long channel test?

    Regards,

    JMMN

  • 0 in reply to JMMN
    Prodigy 180 points

    Dear JMMN

    1. The hub's upstream port connects to a USB 3.0 enabled host. Is there a command sent by the host to enter the Rx loopback mode?Is it different from the command required for Tx test?

    2. The hub port has not been reset.


    3. Both the long channel test and the short channel test failed.

    Thanks.

  • 0 in reply to user3668508
    TI__Guru 60870 points

    Can you share error report?  I would like to see what the noted error is.  Also, can you share picture of setup.  Accept my friend request and you can send it directly to me off-forum.

    Regards,

    JMMN

  • 0 in reply to JMMN
    TI__Guru 60870 points

    Please send me another direct message before your next test session so I can arrange quick support while you are at the test house.

    Regards,

    JMMN