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TUSB8040A1: port numbering issue

Alexander Skulsky
Intellectual 270 points
Part Number: TUSB8040A1

Hi,

I am using several  TUSB8040A1 in my design, the connection is as follows:

One main TUSB8040A1 and two additional TUSB8040A1 the are connected to ports 0 and 3 on the root HUB.

When a board is connected to PC, devices are recognized as connected to ports 3 and 0. 

On one of the boards, the devices are recognized as connected to ports 3 and 2. 

What can be the issue? is there any internal EEPROM that can be corrupted?

  • 0
    TI__Guru 60865 points

    Hello Alexander,

    The port numbering could change if certain ports were marked as unused.  Can you provide the port connection report if it is in Windows or Linux?

    Regards,

    JMMN

  • 0 in reply to JMMN
    Intellectual 270 points

    Hi JMMN

    the report is from windows 10.

    what you can see in the image is a good board with a camera connected to Port 17 on the PC, port 3 on the first TUSB8040A1 Hub and port 3 on the last TUSB4080A1 hub.

    On the corrupt board, Camera/Device was connected to port 2 on the first hub instead of port 3,

    Currently, I was unable to reproduce the problem. the hub is working right

    but I am afraid this issue will appear again.

    Thanks,

    Alexander

  • 0 in reply to Alexander Skulsky
    TI__Guru 60865 points

    Hello Alexander,

    This is very strange behavior, the hub ports are hardcoded.  Can you run a reboot cycle test to see if the problem re-occurs?

    We have never seen an incorrectly reported port number with the USB hubs.

    Regards,

    JMMN

  • 0 in reply to JMMN
    TI__Guru 60865 points

    Please post to reopen the thread if there is additional discussion needed.

    Regards,

    JMMN