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我通过AM3352的1个USB口，外接一路2517HUB，然后HUB的6个口各外接一个FT4232H，1拖4的USB转串口，当串口正常通信的时候，我拔掉任意一个FT4232H设备，就会影响其他设备的正常通信，请问这个是什么原因，3352的USB端点是否对接入的设备数量有最大个数限制？
