数字钟工程，用QuartuesII软件开发的，在DE2-70上运行成功，可以直接使用，计时准确，文件代码简单，适合初学者借鉴。-Digital clock project, using QuartuesII software development, running on the DE2-70 success, can be used directly, accurate timing, file the code is simple, suitable for beginners learn