verilog写ps2接口驱动程序，对状态机的描述。把键盘串行的13为数据转换为并行的8为数据，并储存在寄存器-The needle verilog write ps2 interface drivers, to the descr iption of the state machine. The keyboard for data transfer of serial and parallel for the 8 for data, and stored in a register to xi