How to use the audio core ?

Hi,

I am a beginner on DE2. I just tried one design example of DE2_SD_Card_Audio and it runs great.

I wish to learn to use the audio core in this example (AUDIO_DAC_FIFO), e.g. to play WAVE file from host machine or board memory. But I cannot find any documents (not in HW,SW,Quartus handbooks) about this audio code ?

Could you give me some guidance about this audio core, or where can I find a document about it ?

Thanks a lot!

Regards,

Han