usb 3.0 reset pc driver not loaded!!!!!!!

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Anonymous
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I have make a usb 3.0 board but when it's powered or reseted, sometimes the pc driver is not loaded. (abot 1 time per 10 trials.) why? 

   

When i use the cypress dvk board, same result is appeared.

   

I am using the  Netmate U-511 pci-e card for usb 3.0 I/F.

   

Thanks for your help.

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Anonymous
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