Samsung S3C2451X User Manual page 691

S3C2451 RISC MICROPROCESSOR
27
OVERVIEW
The AC97 Controller Unit of the S3C2451 supports the AC97 revision 2.0 features. AC97 Controller
communicates with AC97 Codec using audio controller link (AC-link). Controller sends the stereo PCM data to
Codec. The external digital-to-analog converter (DAC) in the Codec then converts the audio sample to an analog
audio waveform. Also, Controller receives the stereo PCM data and the mono Mic data from Codec then store in
memories. This chapter describes the programming model for the AC97 Controller Unit. The information in this
chapter requires an understanding of the AC97 revision 2.0 specifications.
FEATURE
− Independent channels for stereo PCM In(Slot3, Slot4), mono MIC In(Slot 6), stereo PCM Out(Slot3, Slot4).
− DMA-based operation and interrupt based operation.
− All of the channels support only 16-bit samples.
− Variable sampling rate AC97 Codec interface (48KHz and below)
− 16-bit, 16 entry FIFOs per channel
− Only primary Codec support
SIGNALS
Name
AC_nRESET
AC_BIT_CLK
AC_SYNC
AC_SDO
AC_SDI
AC97 CONTROLLER
Direction
Output Active-low CODEC reset.
Input 12.288MHz bit-rate clock
Output 48 kHz frame indicator and synchronizer
Output Serial audio output data.
Input Serial audio input data.
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
Description
AC97 CONTROLLER
27-1