STA335BWSQS datasheet(28/70 Pages) STMICROELECTRONICS

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STA335BWSQS

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6.2.2

Serial data interface

The STA335BWSQS audio serial input was designed to interface with standard digital audio

components and to accept a number of serial data formats. STA335BWSQS 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

Table 17.

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

32fs

0000

I2S 15-bit data

0001

Left/right-justified 16-bit data

48fs

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

64fs

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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