Allwinner A20 - 6.9. Digital Audio Interface

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6.9. Digital Audio Interface

6.9.1. Overview

The Digital Audio Interface can be configured as I2S interface or PCM interface by software. When

configured as I2S interface ,it can support the industry standard format for I2S, left-justified, or

right-justified. PCM is a standard method used to digital audio for transmission over digital

communication channels. It supports linear 13 or 16-bits linear, or 8-bit u-law or A-law companded

sample formats at 8K samples/s and can receive and transmit on any selection of four of the first four

slots following PCM_SYNC.

It features:

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

Specification, Revision 2.0

 I2S or PCM configured by software

 Full-duplex synchronous serial interface

 Master / Slave mode operation configured by software

 Audio data resolution of 16, 20, 24

 I2S Audio data sample rate from 8KHz to 192KHz

 I2S data format for standard I2S, Left Justified and Right Justified

 I2S support 8-channel output and 2-channel input

 PCM supports linear sample (8-bits or 16-bits), 8-bits u-law and A-law companded sample

 One 128x24-bit FIFO for data transmit, one 64x24-bit FIFO for data receive

 Programmable FIFO thresholds

 Interrupt and DMA support

 Two 32-bit counters for AV sync application

 Loopback mode for test