wm8731音频采集芯片的I2S采集时序的vhdl实现。-wm8731 I2S audio capture chip timing acquisition vhdl implementation.

这是基于DE2_70开发板的音频采集程序，使用了niosII软核，实现音频数据的采集和播放。-This is the audio capture program based on DE2_70 development board, use the niosII soft core to capture and playback of audio data.