chenxu

代码说明：

  电子时钟，可以显示四位，两位显示分钟，两位显示秒，可以用按键控制清零，以及加减数(Electronic clock, you can display four bit, two bit display minutes, the second display seconds, can be used to control the key to clear, and the addition of subtraction)

文件列表：

程序
....\Clock_maneger.vhd,1231,2017-03-28
....\KEY.vhd,2546,2017-04-22
....\key_smg.vhd,1771,2017-04-22
....\smg_ctr.vhd,5016,2017-04-22
....\smg_ym.vhd,1519,2017-04-22