STA309A datasheet(26/67 Pages) STMICROELECTRONICS

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Registers

STA309A

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7.2.3

Configuration register C (0x02) - serial output formats

The STA309A features a serial audio output interface that consists of 8 channels. The serial

audio output always acts as a slave to the serial audio input interface and, therefore, all

output clocks are synchronous with the input clocks. The output sample frequency (fs) is

also equivalent to the input sample frequency. In the case of SACD/DSD input, the serial

audio output acts as a master with an output sampling frequency of 176.4 kHz. The output

serial format can be selected independently from the input format and is done via the SAO

and SAOFB bits.

SAOFB

SAO3

SAO2

SAIO

SAO0

000

Table 18.

SAO bits

Bit

RST

Name

Description

0RW

SAO0

Serial audio output interface format: determines the

interface format of the output serial digital audio

interface.

1RW

SAO1

2RW

SAO2

3RW

SAO3

Table 19.

SAOFB bit

Bit

RST

Name

Description

4RW

SAOFB

Determines MSB or LSB first for all SAO formats:

0: MSB first

1: LSB first

Table 20.

SAO serial clock

BICKI = BICKO

SAO[3:0]

Interface data format

32 * fs

0111

I2S data

1111

Left/right-justified 16-bit data

48 * fs

1110

I2S data

0001

Left-justified data

1010

Right-justified 24-bit data

1011

Right-justified 20-bit data

1100

Right-justified 18-bit data

1101

Right-justified 16-bit data

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