USB2.0协议英文版，基于目前对这个协议的中文没有找到，所以发给英文的，供大家参考，英文比较牛的，麻烦翻译一下。-USB2.0 protocol in English, based on current Chinese version of this agreement is not found, so sent in English, for your reference, the English more cattle, about trouble translation. Hehe