STA323W ST Microelectronics, STA323W Datasheet - Page 14

• Manufacturer Part Number: STA323W
• Description: 2.1 High Efficiency Digital Audio System
• Manufacturer: ST Microelectronics

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STA323W
7.3 Serial Data Interface
The STA323W serial audio input was designed to interface with standard digital audio components and to
accept a number of serial data formats. The STA323W always acts as a slave when receiving audio input
from standard digital audio components. Serial data for two channels is provided using 3 input pins: left/
right clock LRCKI (pin 33), serial clock BICKI (pin 31), and serial data 1 & 2 SDI12 (pin 32).
The SAI register (Configuration Register B - 01h, Bits D3-D0) and the SAIFB register (Configuration Reg-
ister B - 01h, Bit D4) are used to specify the serial data format. The default serial data format is I2S, MSB-
First. Available formats are shown in Figure 11 and the tables that follow.
Figure 12. General Serial Input and Output Formats
For example, SAI=1110 and SAIFB=1 would specify Right-Justified 16-bit data, LSB-First.
Table 10 below lists the serial audio input formats supported by STA323W as related to BICKI = 32/48/
64fs, where the sampling rate fs = 32/44.1/48/88.2/96/176.4/192 kHz.
Table 9. First Bit Selection Table
Note: Serial input and output formats are specified distinctly.
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I
Left Justified
Right Justified
LRCLK
2
SCLK
SDATA
S
LRCLK
SCLK
SDATA
LRCLK
SCLK
SDATA
SAIFB
0
1
MSB
MSB
MSB
Left
Left
Left
LSB
LSB
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LSB
MSB
MSB
MSB
Right
Right
Right
MSB-First
LSB-First
Format
LSB
LSB
LSB
MSB
MSB
MSB
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