这个是关于用VHDL语言设计出来数字钟的程序，能够实现最基本的功能，对于想学习VHDL语言的人来说，是一个很好练习的例子。-This is about the design using VHDL, digital clock out of the program, to achieve the most basic functions, for people who want to learn VHDL language, it is a good practice example.