电子时钟简单设计模板，内含源代码，并可实现简单计时-Electronic Clock simple design template, containing the source code, and with a simple timing

电子时钟VHDL程序与仿真,详细介绍了设计的整个阶段，验证过，可以运行的。-Electronic clock and simulation of VHDL procedures, detailed design of the stage, verified, you can run.