使用xilinx virtex4芯片，设计环境为EDK，其中包含uart,片外sram操作，flash操作，DDR SDRAM操作，MAC自发自收，audio，video等试验-Xilinx virtex4 use chip design environment for the EDK, which contains the uart, chip sram operation, flash operation, DDR SDRAM operation, MAC spontaneous self-