STA350B datasheet(40/94 Pages) STMICROELECTRONICS

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STA350B, STA350BW

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DocID018572 Rev 7

8.2.2

Serial data interface

The STA350Bx audio serial input was designed to interface with standard digital audio

components and to accept a number of serial data formats. The STA350Bx always acts as

the 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 bits (D3 to D0) and the SAIFB 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

that follow.

8.2.3

Serial data first bit

Table 17. Serial data first bit

SAIFB

Format

0MSB-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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