文件名称:USB_sysyem
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USB体系功能与结构，详细介绍了USB系统的架构及各部分的功能，写的很仔细，对开发usb系统具有很高的学习价值。-USB system function and structure, detailed information on USB system part of the structure and functions, written very carefully, on the development of usb system has a high learning value.
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USB_sysyem.pdf