说明：  多功能数字钟的VHDL源代码。多功能数字钟具有的功能：显示时－分－秒、整点报时、小时和分钟可调等基本功能。钟表的工作是在1Hz信号的作用下进行，每来一个时钟信号，秒增加1秒，当秒从59秒跳转到00秒时，分钟增加1分，同时当分钟从59分跳转到00分时，小时增加1小时。
(Multifunction digital clock VHDL source code. Multi-function digital clock with functions: display- minutes- seconds, the whole point timekeeping, hours and minutes, adjustable and other basic functions. The clock work is under the influence of 1Hz signal, each to a clock signal, second increased by 1 sec, when the seconds jump from 59 seconds to 00 seconds, the minutes increased by 1 pm, at the same time when the minutes from 59 minutes jump to 00 time-sharing, hours increase 1 hour.)