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S3C6400 RISC MICROPROCESSOR
35
AC97 CONTROLLER
This chapter describes the functions and usage of AC97 Controller in SC6400X RISC microprocessor.
OVERVIEW
The AC97 Controller Unit of the S3C6400 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 converts the audio sample to an analog audio
waveform. 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 prerequisite in this chapter
requires an understanding of the AC97 revision 2.0 specifications.
FEATURE
The AC97 Controller includes the following features:
Independent channels for stereo PCM In, stereo PCM Out, mono MIC In.
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
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
35-1
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