利用vhdl硬件描述语言，模拟异步通用串行接口UART的通信方式，已在fpga上实际测试，通信性能不错，有一定的参考学习价值！-Using vhdl hardware descr iption language, simulated UART asynchronous serial interface common means of communication, the actual test in fpga, communication performance is good, there i