此文件为cpu的verilog学习代码，从最简单的cpu开始学习-This file is cpu to study the verilog code, from the simplest cpu to start learning

用verilog设计五级CPU的框架，需要自己另行补充指令，可作为学生作业和训练内容-Five CPU with verilog design framework, needs its own separate supplemental instruction can be used as student assignments and training content