以前学习VHDL语言时做的一个电子闹钟程序，可以实现时，分，秒的计时以及定时，校时，闹钟，整点报时的功能。-VHDL language before learning to do procedures in an electronic alarm clock, you can realize hours, minutes and seconds of time and from time to time, school time, alarm clock, the whole point tim