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TUSB8020B: Connecting a USB Host to Downstream port

Selvaraj Karuppusamy
Intellectual 425 points
Part Number: TUSB8020B

Hi,

What will happen if a USB 3.0 host is connected in downstream port & a USB device is connected to the upstream Port?

Will this interface work? if not what are the limitations in this..?

Is there any schemes avialable to connect 2 dual roll USB ports to another one dual roll USB port?

Thank you.

  • 0
    TI__Guru 60865 points
    Hello Selvaraj,

    You would need to implement a USB hub that supports role reversal. The TI hubs do not support role reversal. The implementation you described will not work with the TUSB8020B.

    Regards,
    JMMN
  • 0 in reply to JMMN
    Intellectual 425 points

    Hi JMMN,

    What is the link speed between the Host processor and USB hub upstream port when downstearm port one is connected to USB3.0 Device & downstream port two is connected to USB 2.0 device?

    Is there any bandwith limitation will happen for the 3.0 device connected to downstream port one?

    Note:

    Host processor is having one USB 3.0 Port.

    Thanks.

  • 0 in reply to Selvaraj Karuppusamy
    TI__Guru 60865 points
    Hi Selvaraj,

    A USB 3.0 cable actually has two separate buses: USB 3.0 and USB 2.0. The host and the hub connect over both buses and there is no translation between USB 2.0 and USB 3.0, the signalling is completely separate.

    Regards,
    JMMN