一个带闹钟的分为12 和24 小时的数字时钟。只有24小时有闹钟，都是原件例化，用的是位置关联-With alarm clock into a 12- and 24-hour digital clock. Only 24-hour alarm, all of the original case, the location associated with the

使用vhdl语言原件例化设计数字频率计，并用6位7段数码管计数。模块包括：十进制计数器，6位10进制计数器，Reg24 锁存器、Fp 分频器、Ctrl 频率控制器、Disp 动态显示。(The digital frequency meter is designed by using VHDL language as an example and counted by 6-bit 7-segment digital tube. Modul