目前以太网PHY芯片是通过总线MDC/MDIO，但是基本上是通过MAC芯片直接管理的，本代码实现了通过FPGA管理PHY。即由FPGA完成MII管理,At present, Ethernet PHY chip through the bus MDC/MDIO, but basically through the direct management of MAC chip, the code through the FPGA implementation management PHY. FPGA

TI 6474 的emac 使用例程，使用88e6122 作为物理芯片，初始化sgmii与mdio,可以向上位机发送数据报文- test code for emac perpheral of dsp tms320c6474,use 88e6122 as phy device and initial sgmii and mdio ,can send ethernet packet to pc