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请问TS3USBA225复用开关应用如何检测某个USB口读写结束?

Other Parts Discussed in Thread: TS3USBA225

在项目中,用到TS3USBA225复用开关,其中U盘接到D+/D-,其余USB HOST接到复用开关其它通路。U盘作为

读取中介。当某个外部USB HOST和U盘读写操作时,如何能检测到读写结束呢?通过检测USB电源电压?如果外部

USB HOST没有断掉USB电源,如何检测呢?问题很困扰人!