SD卡读卡器模块的VHDL及软件驱动代码，可作为外设挂接在Avalon总线上。支持以SD模式、4线模式读取。在24MHz时钟驱动下读取速率可达8MByte/s-SD card reader module and software drivers VHDL code, can be articulated as a peripheral bus in Avalon. To support the SD model, 4-wire mode read. Driven by the 24MHz clo