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

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 

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?

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

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?