本文件为电子设计而开发的多功能数字钟VHDL语言完整源代码 --该数字钟实现的功能有时间，秒表，闹钟，年月日的显示设置等 -This document is multi-functional electronic design and development of a complete VHDL, digital clock source code- the digital clock function can be achieved time, stopwatch, alarm clo