vhdl code of debounce for fpga . you can open it with xilinx and test it with isim or modelsim, it s a good tutorial for writing your first vhdl code and test bench .

Xilinx实现电子时钟功能，具有调整时间功能，设置闹钟功能，闹钟播放音乐等，非常适合VHDL入门。-Xilinx implement electronic clock function, have adjustment time function, set the alarm function, the alarm to play music, ideal for entry VHDL.