STA333W datasheet(25/49 Pages) STMICROELECTRONICS

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STA333W

Doc ID 13365 Rev 2

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Serial audio input interface format

Serial data interface

The STA333W audio serial input interfaces with standard digital audio components and

accepts a number of serial data formats. STA333W 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 SDI.

Bits SAI and bit SAIFB 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.

Serial data first bit

Table 16.

Serial audio input interface format

Bit

R/W

RST

Name

Description

0R/W

0SAI0

Determines the interface format of the input serial

digital audio interface.

1R/W

0SAI1

2R/W

0SAI2

3R/W

0SAI3

Table 17.

Serial data first bit

SAIFB

Format

MSB-first

LSB-first

Table 18.

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

BICKI

SAI [3:0]

SAIFB

Interface format

32 * fS

0000

I2S 15-bit data

0001

Left/right justified 16-bit data

48* fS

0000

I2S 16- to 23-bit data

0001

Left justified 16- to 24-bit data

0010

Right justified 24-bit data

0110

Right justified 20-bit data

1010

Right justified 18-bit data

1110

Right justified 16-bit data

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