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USB有主从模式以及主从兼容切换模式，现在设计只需要最普通常用的模式就可以了，那么请问tm4c123gh6pm数据手册里的USB的这些管脚是否都必须用上？还是说只需要使用USBDM和USBDP就可以了？
普通模式的话，用USB的四根线就OK了呀，事实上USB也就只有四根线
