usb1.1标准协议,包括:ACK:确认信号 ctive Device:正在使用的设备 synchronous Data:异步数据 synchronous RA:异步自适应速率 -usb1.1 standard protocols, including : ACK : confirmation signal Merit Device : The equipment used is synchronous Data : Asynchronous data synchronous RA : as

USB1.1协议的中文详细说明，内有8篇文档，适合英文水平不高者最佳选择。-USB1.1 agreement detailing the Chinese, there are eight files, suitable for the high level of English were the best choice.