USB application programming details, one very worthy of study, described in detail usb protocol specification. If you want to understand this knowledge, we take a look at.

Packet : 83390092usb_20_new.zip filelist
usb_20/
usb_20/2002_05_28_errata.pdf
usb_20/ecn1-usb20-miniB-revd.pdf
usb_20/errata-092800-1207001.pdf
usb_20/InterfaceAssociationDescriptor_ecn.pdf
__MACOSX/
__MACOSX/usb_20/
__MACOSX/usb_20/._OTG_Errata_Update_1.0.pdf
usb_20/resistor_ecn.pdf
usb_20/rnd_chmfr_ECNFINAL.pdf
usb_20/usb_20.pdf
usb_20/UnicodeECN.pdf
usb_20/Inter-Chip USB Supplement to the USB 2.0 Specification_1.0.pdf
usb_20/OTG Supplement v1.2.pdf

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