Abstract: Ethernet ieee802.3 agreements on the basis of the lan,Data link layer depart into LLC and MAC two layers.The MAC agreement is basis of receive data frame or send data frame,is the core of the ethernet technology,It is mainly responsible for the data and the physical layer data traffic control and data of the inspection and verification.This passage introduce design of 10 MHz/100 MHz MAC controller,Use Verilog language designed for all.Design the Validation board by myself.Use the FPGA(EP1C20F400C8)made by Altera to validate the function.