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TUSB8020B: Chip application problems

Part Number: TUSB8020B

Hi,

     I used TUSB8020 have some problem:

    1. Does TUSB8020 chip do not need flash?
    2.In using TUSB8020's HUB often fails to respond.After replacing the chip, the problem was solved. Which side will there be a problem?
    3.Why do Usb3.0 discs be recognized as usb2.0? Which side will there be a problem?
thanks.