usb 1.1 规范 The 1.1 revision of the specification is intended for product desig...

usb 1.1 规范 The 1.1 revision of the specification is intended for product design. Every attempt has been made to ensure a consistent and implementable specification. Implementations should ensure compliance with this revision.-usb 1.1 specification The 1.1 revision of the specification is intended for product design. Every attempt has been made to ensure aconsistent and implementable specification. Implementations should ensure compliance with this revision.

usb11.pdf