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F28M35 usb_bulk程序出现unknown device情况



本人使用F28M35例程做USB实验,使用自带V201版本的USB_BULK例程,将程序烧录到FLASH,在挂仿真器全速运行时,系统能识别到USB的VID,PID,可以顺利安装自带的驱动;但是断电后,拔出仿真器,再重新上电,在一两分钟过后在USB总线下出现unknown device。如何解决?请高手帮忙啊!