学习使用DO文件进行仿真的基本方法,根据ModelSim提供的命令或者Tcl/Tk语言的语法，将仿真Cmd流程的仿真命令依次编写到扩展名为“do”的宏文件中，然后直接执行这个DO文件，就可以完成整个仿真流程-DO learn how to use basic file simulation method, according to the syntax of the command or ModelSim provides Tcl/Tk language will flow simulation simulation Cmd command sequence written to the macro file extension "do" in, and then execute the file directly DO , you can complete the entire simulation process