USB devices work properly before, the first thing to do is to enumerate. Enumeration is for HOST recognize the device and equipment to prepare their requests for resources, the establishment of good information between the host and device communication mechanism. USB enumeration is a series of orderly and coherent process but, even if only a trace request or Zibaojiamen error, even within the stipulated time and could not answer, the device is shut down. enumerate naturally will not be successful .

USB_equipment.pdf

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