发布时间:2017-02-16 10:33:46
转载自:http://blog.csdn.net/tianshiyalin/article/details/17250755http://blog.csdn.net/cescf4/article/details/8601457http://blog.csdn.net/yanlai20/article/details/12967015USB2.0是向下兼容USB1.X的,即USB2.0支持高速,全速,低速的USB设备(HIGH-SPEED,FULL-SPEED,LOW-SPEED),而USB1.X不支持.........【阅读全文】