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TUSB211A: USB I/O port behavior when Vcc is not supplied

Atsushi Takahashi
Intellectual 855 points
Part Number: TUSB211A
Other Parts Discussed in Thread: DXP

Tool/software:

Hi Team,

If there is an input to one USB I/O port(DxP/DxM) when Vcc is not supplied, what will be behavior of the other USBI I/O port(DxP/DxM)?

Best Regards,

  • 0
    TI__Mastermind 18160 points

    Hi Atsushi,

    If VCC is not being supplied, then the redriver will not be enabled. Signals that go through the DP/DM lanes will not be boosted by the device, and should not be affected by the redriver.

    Please let me know if you need any clarification or have any other questions.

    Thanks,

    Ryan 

  • 0 in reply to Ryan Kitto
    Intellectual 855 points

    Hi Ryan-san,

    Thank you for your reply.

    Before Vcc is supplied, a signal on noise may be input to one DP/DM.
    In that case, will the raw signal(that is, a signal on noise) appear at the other DP/DM as output?

  • 0 in reply to Atsushi Takahashi
    TI__Mastermind 18160 points

    Hi Atsushi-san,

    Our redriver will have no effect on the signal or noise as it passes through, especially if it is only one lane. Whatever goes in through one DP/DM, will come out the other. This is because our redrivers do not directly affect the signal when disabled or when in LS/FS.

    Please let me know if you have any other questions!

    Thanks,

    Ryan

  • 0 in reply to Ryan Kitto
    Intellectual 855 points

    Hi Ryan-san,

    Thank you for your reply.

    I can imagine that if Vcc is supplied and device is disabled by RSTN , the signal will be passed through as is on the DP/DM lanes.

    Is it same when Vcc is not supplied?

  • +1 in reply to Atsushi Takahashi
    TI__Mastermind 18160 points

    Hi Atsushi-san,

    Atsushi Takahashi said:

    I can imagine that if Vcc is supplied and device is disabled by RSTN , the signal will be passed through as is on the DP/DM lanes.

    Is it same when Vcc is not supplied?

    Yes, both of these are correct. When in RSTN, or when VCC is not supplied, the signal will simply passthrough the DP/DM lanes as it.

    Please let me know if you have any other questions!

    Thanks,

    Ryan