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使用tusb4041做的hub，官方的原理图，中间加了usb隔离芯片adum4160，使用过程中掉线，设备管理器里显示：未知usb设备（设备描述符请求失败）
重新插拔又好了，实在很困惑。电脑到hub线长也就1m的样子，电源是外接的电源模块供电
