Allwinner A20 - AC97 Interface; Overview

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6.10. AC97 Interface

6.10.1. Overview

The AC97 interface supports AC97 revision 2.3 features. AC97 controller communicates with AC97

Codec using an 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 Microphone data from Codec then

stores in memories.

It features:

 Support industry-standard AMBA Peripheral Bus (APB) and it is fully compliant with the AMBA

Specification, Revision 2.0

 Support APB 32-bits bus width

 Comply with AC97 2.3 component specification

 Full-duplex synchronous serial interface

 Support 2 channels, TX (stereo),RX (PCM stereo, MIC mono optional)

 Variable sampling rate AC97 codec interface support, up to 48KHz

 Support 2-channel and 6-channel audio data output

 DRA mode support

 Only one primary codec support

 Channels support mono or stereo samples of 16(standard), 18(optional) and 20(optional) bit wide

 One 96×20-bit FIFO and one 32×20-bit FIFO for data transfer

 Programmable FIFO thresholds

 Interrupt and DMA support