用VHDL编程实现乐曲播放器设计。使用层次化设计方法，实现乐曲播放器的设计； 使用数控分频器设计硬件乐曲演奏电路，实现多首乐曲播放功能。 -The music player design with VHDL programming. Using the hierarchical design method, design music player NC crossover design hardware music playing the circuit, the song pla