本代码为控制三星公司nand flash，型号k9f5608，实现了读写和擦除操作，方便调用,The code for the control of Samsung nand flash, model k9f5608, achieved a read-write and erase operations to facilitate the call

控制nand flash的演示框架，可自行填写代码，clk始终不超过100MHz-Control nand flash presentation framework should fill in the code, clk always less than 100MHz