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WM8733

WOLFSON MICROELECTRONICS LTD

PP Rev 1.3 July 2000

7

SERIAL DATA INTERFACE

WM8733 has serial interface formats that are fully compatible with both normal (MSB first, right-

justified) and I

LOW, normal data format is selected. When the format is HIGH, I

If the application demands 16-bit or 20-bit data, then I

in 20-bit mode. Normal mode will support 18-bit data applications or 16-bit packed mode applications

(automatically detected).

Note: In 16-bit “packed” mode operation (exactly 32 BLCKS per LRCIN period) the data word must

align exactly with LRCIN clock edges (effectively both left and right justified at the same time).

FORMAT

DESCRIPTION

0

1

Normal format (MSB-first, right justified)

I

Table 3 Serial Interface Formats

MSB

MSB

LSB

LSB

LEFT CHANNEL

RIGHT CHANNEL

LRCIN

BCKIN

DIN

AUDIO DATA WORD = 18-BIT

1/fs

1

2

3

161718

1

2

3

16 17 18

Figure 1 ‘Normal’ Data Input Timing

MSB

MSB

LSB

LSB

LEFT CHANNEL

RIGHT CHANNEL

LRCIN

BCKIN

DIN

AUDIO DATA WORD = 18-BIT

1/fs

12

3

16 17 18

12

3

16 17 18

Figure 2 I