完成sdram读写操作，并附有测试脚本文件，已通过后仿验证。该程序主要包括上电初始化模块，刷新模块，读、写模块等，并采用FSM控制所有模块，完成数据的读写操作-Sdram read and write operations to complete, with a test scr ipt file has been verified through simulation. The program includes power-on initialization module, refresh m