Datasheet

Registers STA309A

24/67 Doc ID 13855 Rev 4

7.2.2 Configuration register B (0x01) - serial input formats

Serial data interface

The STA309A audio serial input interfaces with standard digital audio components and

accepts a number of serial data formats. STA309A always acts a slave when receiving audio

input from standard digital audio components. Serial data for eight channels is provided

using 6 input pins: left/right clock LRCKI (pin 10), serial clock BICKI (pin 11), serial data 1

and 2 SDI12 (pin 9), serial data 3 and 4 SDI34 (pin 8), serial data 5 and 6 SDI56 (pin 7), and

serial data 7 and 8 SDI78 (pin 6). The SAI/SAIFB register (Configuration Register B,

address 0x01) is used to specify the serial data format. The default serial data format is I

MSB-first. Available formats are shown in the tables and figure that follow.

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.

D7 D6 D5 D4 D3 D2 D1 D0

Reserved SAIFB SAI3 SAI2 SAI1 SAI0

00000000

Table 15. SAI bits

Bit RW RST Name Description

0 RW 0 SAI0

Serial audio input interface format: determines the

interface format of the input serial digital audio

interface.

1 RW 0 SAI1

2 RW 0 SAI2

3 RW 0 SAI3

Table 16. SAIFB bit

Bit RW RST Name Description

4 RW 0 SAIFB

Determines MSB or LSB first for all SAO formats:

0: MSB first

1: LSB first