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AM335x中USB_DRVVBUS和USB_VBUS的作用各是什么呢？感觉前者像是个使能控制，后者是电源。看到evm板上，usb0是作为OTG设备，用了一片TPS2051作为使能控制。但是usb1是作为主机的，为什么还要加上TPS2051呢？
你好！可以参考TI FAE总结的关于USB设计的帖子
http://www.deyisupport.com/question_answer/dsp_arm/sitara_arm/f/25/t/47199.aspx
