Rainbow-electronics AT73C246 Bedienungsanleitung PDF herunterladen (Seite 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

S port. The following modes are

provided:

•I2S,

• Left Justified,

• Right Justified, and

• SSC

The I

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

(1)

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

n-1

n bits Right Channeln bits Left Channel

LRFS

BCLK

SDOUT

MCLK

SDIN

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 158 159

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Rainbow-electronics AT73C246 Bedienungsanleitung Seite 66