VHDL编写的Keyboard control使用ps2 keboard来使fgpa的led上显示键盘的二进制代码，用4个7seg来显示0-9的数字，该程序包含testbench.-ps2 keyboard controller which could enable led on fgpa to show the binary code of each key on ps2 keyboard and another four 7segment will display the number from 0 to 9 when you press those number on keyboard, besides it will display E on 7seg when you press others.