WM8580 datasheet(28/103 Pages) WOLFSON

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WM8580

Production Data

PD Rev 4.5 February 2008

The MSB of the output data changes on the same falling edge of BCLK as the low to high LRCLK

transition and may be sampled on the rising edge of BCLK. The right channel data is contiguous with

the left channel data.

Figure 22 DSP Mode B Timing Diagram – PAIF/SAIF Transmitter Data

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 register for a transmit interface results in output data changing on the rising edge of

BCLK.

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: I2S 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

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