STA323W_06 datasheet(37/71 Pages) STMICROELECTRONICS

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STA323W

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7.2

Configuration register B (address 0x01)

7.2.1

Serial audio input interface format

7.3

Serial data interface

The STA323W serial audio input interfaces with standard digital audio components and

accepts several different serial data formats. The STA323W always acts as a slave when

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

is provided using 3 input pins: left/right clock LRCKI (pin 33), serial clock BICKI (pin 31), and

serial data 1 and 2 SDI12 (pin 32).

The SAI register (configuration register B - 0x01, bits D3-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. The formats available are shown in Figure 48 and

in Table 21, Table 22, and Table 22.

Figure 48.

General serial input and output formats

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

C1IM

DSCKE

SAIFB

SAI3

SAI2

SAI1

SAI0

0000

Table 20.

Serial audio input interface format

Bit

R/W

RST

Name

Description

3…0

R/W

0000

SAI (3...0)

Determines the interface format of the input serial digital audio

interface.

Left Justified

LRCLK

Left

Right

SCLK

SDATA

LSB

MSB

LSB

MSB

LRCLK

Left

Right

SCLK

SDATA

LSB

MSB

LSB

MSB

Right Justified

LRCLK

Left

Right

SCLK

SDATA

LSB

MSB

LSB

MSB

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