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AM335x USB HUB 卡死问题

我们的AM335X核心板是在原厂和beaglebone的板子上做了删改做成的核心板,作为子板焊接在母板上,母板上有一颗USB2.0 HUB芯片(1转4)Microchip USB2514,BSP主体是335X EVM的WINCE CODE,

1,HUB芯片自供电;

2,AM335X通过的USB1与HUB芯片的上行口D+,D-直连;

3,AM335X USB1配置为HOST模式,限流芯片采用RT9702;

故障现象如下:

1,在系统界面,快速多次插拔U盘后,无法再识别U盘;

2,无法识别U盘后,其他口,其他U盘同样无法识别,鼠标键盘也无法识别;

3,通过HUB芯片的RESET脚,复位HUB芯片,此时能恢复USB设备;