本设计是用VHDL语言来实现的基于RS232按位串行通信总线的行列式矩阵键盘接口电路，具有复位和串行数据的接收与发送功能，根据发光二极管led0—led2的显示状态可判断芯片的工作情况；实现所有电路功能的程序均是在美国

ALTERA公司生产的具有现场可编程功能的芯片EPM7128SLC84-15上调试通过的。该电路的设计贴近生活，实用性强，制成芯片后可作为一般的PC机键盘与主机的接口使用。

-The design is based on VHDL language to achieve bit serial RS232 communication bus according to the determinant of matrix keyboard interface circuit with a reset, and serial data reception and transmission capabilities, according to light-emitting diode display led0-led2 status can be judged chip work　to achieve all the circuit functions of the program are produced in the United States has ALTERA Field Programmable functions EPM7128SLC84-15 on-chip debug passed. The circuit design of daily life, practical, post-produced chips can be used as a general PC, the keyboard and the host interface.