STA333W datasheet(25/50 Pages) STMICROELECTRONICS

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STA333W

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

64* fS

0000

I²S 16- to 24-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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