基于FPGA开发的键盘扫描程序，适合初学者更好的了解FPGA。
Keyboard scanning procedures based on the FPGA development, suitable for beginners to better understand FPGA.
说明：利用VHDL语言编写的4*4键盘扫描程序，经过测试，可以放心使用。
Using VHDL language 4* 4 keyboard scanning procedures, tested, safe to use.
CTBUG提供了许多很有用的子程序供用户调用，其中包括有键盘扫描、键盘输入等待，显示更新，数据显示等子程序。
CTBUG supplies a lot of very useful subroutines which may be called by users, including Keyboard Scan, Keyboard Input Wait, Display Update and Data Display subroutines and so on.
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