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TUSB7340 pin usage questions

Other Parts Discussed in Thread: TUSB7340, TUSB7320

Hi Team,

 

My customer is now making sch design now, that would use our TUSB7340, for 4 ports USB2.0.

 

Some questions that need your help:

  1. For TUSB7320/40, what’s the function of  pins PERST, WAKE, FREQSEL ? 

    Are the pins mentioned above must be required for application ?

     

  2. Now we would like to connect it to SOC GPIO, but still, we don’t know how to control these pins, and what sequence yet. Could your help some guide ?

 

Thanks for your help.

  • Hello,
    Terminal FREQSEL must be tied low.
    Terminal WAKE can be left floating if wake support is not needed.
    PERST# is controlled by the PCIe Host, you have to make sure to follow the power-up sequence described in the datasheet.

    You system has to be compliant with xHCI spec.
    Regards