键盘和USB与PC机的接口程序，适用于CPLD FPGA设计中，与上位机的连接与通信-Keyboard and USB and PC-interface program for the design of CPLD FPGA with PC connectivity and communication

In this example w ill interface the PS/2 port to a PS/2 keyboard, also known as an AT keyboard. The example will not apply to the newer USB keyboards, or to the older, obsolete XT keyboard. Keyboards contain their own microprocessors that conti