STA333BW datasheet(25/64 Pages) STMICROELECTRONICS

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STA333BW

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6.2

Configuration register B (0x01)

6.2.1

Serial audio input interface format

6.2.2

Serial data interface

The STA333BW audio serial input was designed to interface with standard digital audio

components and to accept a number of serial data formats. STA333BW always acts a slave

when receiving audio input from standard digital audio components. Serial data for two

channels is provided using three inputs: left/right clock LRCKI, serial clock BICKI, and serial

data 1 and 2 SDI12.

The SAI register (configuration register B (0x01), bits D3 to D0) and the SAIFB register

(configuration register B (0x01), bit D4) are 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.

6.2.3

Serial data first bit

C2IM

C1IM

DSCKE

SAIFB

SAI3

SAI2

SAI1

SAI0

000

Bit

R/W

RST

Name

Description

R/W

SAI0

Determines the interface format of the input serial

digital audio interface.

R/W

SAI1

R/W

SAI2

R/W

SAI3

SAIFB

Format

0MSB-first

LSB-first

Table 11.

Support serial audio input formats for MSB-first (SAIFB = 0)

BICKI

SAI [3:0]

SAIFB

Interface format

32fs

0000

I2S 15-bit data

0001

Left/right-justified 16-bit data

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