AC101网络驱动程序，里面包含相当详细的注释，且使用GPIO模拟MDIO、MDC等接口-AC101 network driver, which contains quite detailed notes, and use the GPIO analog MDIO, MDC and other interfaces

以太网的mac与phy之间通过mdio通信，可以实现mdio接口的读写-Through the mdio communication between Ethernet MAC and phy, can realize the mdio interface to read and write