STA311B datasheet(33/102 Pages) STMICROELECTRONICS

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STA311B

Registers

102

8.2.2

Configuration register B (0x01) - serial input formats

Serial data interface

The STA311B audio serial input interfaces with standard digital audio components and

accepts a number of serial data formats. The STA311B 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, serial clock BICKI, serial data 1 and 2

SDI_12, serial data 3 and 4 SDI_34, serial data 5 and 6 SDI_56, and serial data 7 and 8

SDI_78. 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 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.

The table below lists the serial audio input formats supported by STA311B as related to

BICKI = 32 * fs, 48 * fs, 64 * fs, where sampling rate, fs = 32, 44.1, 48, 88.2, 96, 176.4,

192 kHz.

SAIFB

SAI3

SAI2

SAI1

SAI0

Bit

RST

Name

Description

SAI0

Serial audio input interface format: determines the

interface format of the input serial digital audio

interface

SAI1

SAI2

SAI3

Bit

RST

Name

Description

SAIFB

Determines MSB or LSB first for all SAO formats:

0: MSB first

1: LSB first

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