On the USB serial bus system has a detailed introduction into bus protocol and the connection

Packet : 47651451usb.rar filelist
USB 通用串行总线技术规范简介\Power_Analog20070903_05\USB 通用串行总线技术规范简介.pdf
USB 通用串行总线技术规范简介\Power_Analog20070903_05
USB 通用串行总线技术规范简介

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