Datasheet

STA333W Register description

Doc ID 13365 Rev 2 25/49

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 I

S, 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/W0SAI0

Determines the interface format of the input serial

digital audio interface.

1R/W0SAI1

2R/W0SAI2

3R/W0SAI3

Table 17. Serial data first bit

SAIFB Format

0 MSB-first

1 LSB-first

Table 18. Support serial audio input formats for MSB first (SAIFB = 0)

BICKI SAI [3:0] SAIFB Interface format

32 * f

0000 0 I

S 15-bit data

0001 0 Left/right justified 16-bit data

48* f

0000 0 I

S 16- to 23-bit data

0001 0 Left justified 16- to 24-bit data

0010 0 Right justified 24-bit data

0110 0 Right justified 20-bit data

1010 0 Right justified 18-bit data

1110 0 Right justified 16-bit data