用来测试MAC地址回环的VERILOG程序，可以继续完善它-Loop used to test the MAC address of the VERILOG program, you can continue to improve it

通过FPGA驱动千兆以太网口，完成SPARTAN6上的UDP数据包闭环测试，即通过网口发送数据包到FPGA，FPGA内部将接收到的数据返回到PC机，建议测试之前添加ARP静态绑定，FGPA内部的IP以及MAC地址在ROM里的COE文档里可以看到，发送端添加了CRC以及整体CHECKSUM的计算(Driven by FPGA Gigabit Ethernet port, UDP SPARTAN6 data packet on the closed loop test, through the ne

实现IP地址和mac地址存储，以及由已知IP地址查询到对应的mac地址(The storage of IP address and MAC address is realized, and the corresponding MAC address is querying from the known IP address.)