Quartus-Altera Nios... VHDl based, complete MIPS implementation, document, flowcharts plus code

用Verilog语言，quartus软件，实现fpga开发板上按dou lai mi fa等7个音实现按键弹钢琴(Verilog language, quartus software, to achieve fpga development board by dou lai mi fa 7 sound to achieve the key to play the piano)