6 digital audio interface, 1 general description, 2 data transfer: i²s mode – Rainbow Electronics AT73C246 User Manual
Page 66
66
11050A–PMAAC–07-Apr-10
AT73C246
12.6 Digital Audio Interface
12.6.1
General Description
AT73C246 features a 16 to 24-bit multi-mode master / slave I
2
S port. The following modes are
provided:
• I2S,
• Left Justified,
• Right Justified, and
• SSC
The I
2
S port is configured through register I2S_CONTROL (0x13) and FRAME_CONTROL
(0x14). For each of the listed modes, the data transfer is described in the following sections.
The following table provides authorized MCLK / FS ratios and associated filter types:
Note:
1. 12.0000 MHz case is not provided if DAI is configured in Right-Justified and Master mode in
DAI_CONTROL (0x13) and FRAME_CONTROL registers (0x14).
12.6.2
Data Transfer: I²S MODE
Figure 12-7. N-bit I²S Mode (FS = 44.1KHz - MCLK = 256 x FS)
Table 12-3.
Authorized MCLK / FS Ratios & Filter Types
12 MHz
12.288 MHz
18.432 MHz
11.2896 MHz
16.9344 MHz
8 KHz
0
2
2
NA
NA
16 KHz
0
2
2
NA
NA
32 KHz
0
2
2
NA
NA
48 KHz
3
1
1
NA
NA
96 KHz
4
3
3
NA
NA
22.05 KHz
1
NA
NA
1
1
44.1 KHz
1
NA
NA
1
1
88.2 KHz
3
NA
NA
3
3
R
0
R
1
R
2
R
3
R
n-1
R
n
L
0
L
n-1
L
n
n bits Right Channel
n bits Left Channel
LRFS
BCLK
SDOUT
MCLK
SDIN