运用FPGA编写了一个简易电子琴，按不同的键就可以发出相应的声音，并且可以存储，按下一个键时就可以将存储器中的内容输出 发出相应的音节-Use the FPGA to write a simple keyboard, press different keys can be issued the corresponding sound, and can be stored, press a key on the contents of the memory can be output to iss