Audio core from Terasic vs Altera UP

today I realize that there're 2 audio core. In demo SD_CARD_AUDIO, they used audio core from Terasic, but I can find its user manual!!!Plz provide me this manual! I found this line of code: IOWR(BASE_AUIDO_ADDR, 0,# value) -> offset 0 is data regsiter??? In SOPC,I see address have 4 byte In UP Audio core, there's 12 address. And user manual says registers +8 and +12 are data registers. More other, it uses another UP IP core, Audio-video-config. My working project is playing audio in uClinux, but I did not have audio driver.