USB协议2.0(中文版) ....................\01 intro.doc ....................\02 术语和缩略词.doc ....................\05 USB数据流模型.doc ....................\07 USB电气特性(缩写).doc ....................\08 协议层.doc ....................\09 USB设备架构.doc ....................\10 usb主机硬件软件.doc ....................\11 集线器规范_1.doc ....................\3背景.pdf ....................\4体系结构概述.pdf