WM8741 datasheet(46/63 Pages) WOLFSON

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WM8741

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PP Rev 1.3 October 2007

ADDRESS

BITS

NAME

DEFAULT

DESCRIPTION

VOL_RAMP

Ramps volume from existing attenuation setting to new setting when

UPDATE applied.

0: Step volume change

1: Ramp volume change

ATT2DB

Anti-clipping mode control. Attenuates PCM gain path by 2 dB:

0: 0dB gain

1: -2dB gain

ATC

Attenuator Control Mode:

0 = Right channels use Right attenuation

1 = Right Channels use Left Attenuation

SOFTMUTE

Soft mute select

0: Normal Operation

1: Soft mute both channels

IZD

Enables infinite zero detect (detects 1024 zeros on input):

0 = Disable infinite zero detect

1 = Enable infinite zero detect

6:5

ZEROFLR

[1:0]

Zero flag output:

00 = Pin assigned to logical AND of LEFT and RIGHT channels

01 = Pin assigned to LEFT channel

10 = Pin assigned to RIGHT channel

11 = ZFLAG disabled

Volume

Control

04h

AMUTE

Applies analogue mute in DSD mode

0 = Normal operation

1 = Analogue mute applied

Table 55 R4 Volume Control Register

ADDRESS

BITS

NAME

DEFAULT

DESCRIPTION

[1:0]

IWL[1:0]

Audio interface input word length.

00 = 16-bit

01 = 20-bit

10 = 24-bit

11 = 32-bit

[3:2]

FMT[1:0]

Audio data format select.

00 = right justified mode

01 = left justified mode

10 = I2S mode

11 = DSP mode

LRP

Polarity select for LRCLK/DSP mode select.

0 = normal LRCLK polarity/DSP mode A

1 = inverted LRCLK polarity/DSP mode B

BCP

BCLK / DSD64CLK polarity select:

0 = normal polarity

1 = inverted polarity

REV

Analogue output phase control:

0 = Normal

1 = Inverted

Format

Control

05h

PWDN

Power Down Mode Select:

0 = Normal Mode

1 = Power Down Mode

Table 56 R5 Format Control Register

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