FPGA通过ps2接收键盘数据，然后把接收到的字母A到Z键值转换相应的ASII码，通过串口发送到PC机上。

实验时，需要接键盘，还要用调试助手，下载程序后，在键盘上按下一个键，比如A，则在PC调试助手上可看到A

-FPGA receives data via the keyboard ps2, and then received the letters A through Z keys corresponding conversion ASII code sent to the PC via the serial port.

Experiment, you need to pick a keyboard, but also with debugging assistant, after downloading the program, press a key on the keyboard, such as A, then the PC can see A debugging assistant