STA309A datasheet(24/67 Pages) STMICROELECTRONICS

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Registers

STA309A

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Doc ID 13855 Rev 4

7.2.2

Configuration register B (0x01) - serial input formats

Serial data interface

The STA309A audio serial input interfaces with standard digital audio components and

accepts a number of serial data formats. STA309A always acts a slave when receiving audio

input from standard digital audio components. Serial data for eight channels is provided

using 6 input pins: left/right clock LRCKI (pin 10), serial clock BICKI (pin 11), serial data 1

and 2 SDI12 (pin 9), serial data 3 and 4 SDI34 (pin 8), serial data 5 and 6 SDI56 (pin 7), and

serial data 7 and 8 SDI78 (pin 6). The SAI/SAIFB register (Configuration Register B,

address 0x01) is used to specify the serial data format. The default serial data format is I2S,

MSB-first. Available formats are shown in the tables and figure that follow.

Note:

Serial input and output formats are specified separately

For example, SAI = 1110 and SAIFB = 1 would specify right-justified 16-bit data, LSB-first.

Reserved

SAIFB

SAI3

SAI2

SAI1

SAI0

000

Table 15.

SAI bits

Bit

RST

Name

Description

SAI0

Serial audio input interface format: determines the

interface format of the input serial digital audio

interface.

SAI1

SAI2

SAI3

Table 16.

SAIFB bit

Bit

RST

Name

Description

SAIFB

Determines MSB or LSB first for all SAO formats:

0: MSB first

1: LSB first

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