Datasheet

STA559BW Register description
Doc ID 18190 Rev 1 25/67
Serial audio input interface format
Serial data interface
The STA559BW audio serial input interfaces with standard digital audio components and
accepts a number of serial data formats. STA559BW always acts as 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
2
S, MSB first. Available formats are shown in the tables and figure that follow.
Serial data first bit
Table 16. Serial audio input interface
Bit R/W RST Name Description
0R/W0 SAI0
Determines the interface format of the input serial
digital audio interface.
1R/W0 SAI1
2R/W0 SAI2
3R/W0 SAI3
Table 17. Serial data first bit
SAIFB Format
0 MSB-first
1 LSB-first
Table 18. Support serial audio input formats for MSB-first
BICKI SAI [3:0] SAIFB Interface format
32 * fs
0000 0 I
2
S 15-bit data
0001 0 Left/right-justified 16-bit data
48 * fs
0000 0 I
2
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