STA311B datasheet(18/102 Pages) STMICROELECTRONICS

18 / 102 page

Serial audio interface

STA311B

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DocID024340 Rev 1

4.2

Serial data formats

Available formats are shown in the following tables.

Note:

Serial input and output formats are specified separately

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

The table below lists the serial audio input formats supported by the STA311B as related to

BICKI = 32 * fs, 48 * fs, 64 * fs, where the sampling rate, fs = 32, 44.1, 48, 88.2, 96, 176.4,

192 kHz.

Table 9. Serial data bit first

Bit

RST

Name

Description

SAIFB

Determines MSB or LSB first for all SAO formats:

0: MSB first

1: LSB first

Table 10. Serial audio input formats according to sampling rate

BICKI

SAI [3:0]

SAIFB

Interface format

32 * fs

1100

I²SI²S 15-bit data

1110

Left/right-justified 16-bit data

48 * fs

0100

I²S 23-bit data

0100

I²S 20-bit data

1000

I²S 18-bit data

0100

MSB-first I²S 16-bit data

1100

LSB-first I²S 16-bit data

0001

Left-justified 24-bit data

0101

Left-justified 20-bit data

1001

Left-justified 18-bit data

1101

Left-justified 16-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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