altera de2-70 FPGA板功能测试实验，用于SD卡0扇区的读写。包含完整源代码，仿真文件，可直接下载到板子上的SOF文件，适合初学者研习。-Altera de2-70 FPGA board function test, used for SD card 0 sector, speaking, reading and writing. Contains the complete source code, the simulation files, can be directly dow