WM8581 datasheet(31/100 Pages) WOLFSON

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Production Data

WM8581

PD Rev 4.0 April 2007

AUDIO INTERFACE CONTROL

The register bits controlling the audio interfaces are summarized below. Dynamically changing the

audio data format may cause erroneous operation, and is not recommended.

Interface timing is such that the input data and LRCLK are sampled on the rising edge of the interface

BCLK. Output data changes on the falling edge of the interface BCLK. By setting the appropriate bit

clock polarity control register bits, e.g. PAIFRXBCP, the polarity of BCLK may be reversed, allowing

input data and LRCLK to be sampled on the falling edge of BCLK. Setting the bit clock polarity

Similarly, the polarity of left/right clocks can be reversed by setting the appropriate left right polarity

bits, e.g. PAIFRXLRP.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

1:0

PAIFRXFMT

[1:0]

PAIF Receiver Audio Data Format

Select

11: DSP Format

10: I

2S Format

01: Left justified

00: Right justified

3:2

PAIFRXWL

[1:0]

PAIF Receiver Audio Data Word

Length

11: 32 bits (see Note 1,2)

10: 24 bits

01: 20 bits

00: 16 bits

PAIFRXLRP

In LJ/RJ/I2S modes

0 = LRCLK not inverted

1 = LRCLK inverted

In DSP Format:

0 = DSP Mode A

1 = DSP Mode B

R12

PAIF 3

0Ch

PAIFRXBCP

PAIF Receiver BCLK polarity

0 = BCLK not inverted

1 = BCLK inverted

1:0

PAIFTXFMT

[1:0]

PAIF Transmitter Audio Data Format

Select

11: DSP Format

10: I

2S Format

01: Left justified

00: Right justified

3:2

PAIFTXWL

[1:0]

PAIF Transmitter Audio Data Word

Length

11: 32 bits (see Note 1,2)

10: 24 bits

01: 20 bits

00: 16 bits

R13

PAIF 4

0Dh

PAIFTXLRP

In LJ/RJ/I2S modes

0 = LRCLK not inverted

1 = LRCLK inverted

In DSP Format:

0 = DSP Mode A

1 = DSP Mode B

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