键盘有很多种，有4x4键盘，有ps2键盘等等。这是个ps2 键盘的输入，同时显示键盘的输入值-There are a variety of keyboards, with 4x4 keyboard, a ps2 keyboard and so on. This is a ps2 keyboard input, keyboard input values displayed simultaneously

基于vhdl的键盘内核程序，用nios 2编写，有助于nios内核的学习-Use nios vhdl keyboard kernel procedures written to help nios kernel learning