WM8741
Production Data
REGISTER
ADDRESS
R4
BITS
NAME
DEFAULT
DESCRIPTION
0
VOL_RAMP
0
Ramps volume from existing attenuation setting to new setting when
UPDATE applied.
Volume
Control
0: Step volume change
04h
1: Ramp volume change
1
2
ATT2DB
ATC
0
0
Anti-clipping mode control. Attenuates PCM gain path by 2 dB:
0: 0dB gain
1: -2dB gain
Attenuator Control Mode:
0 = Right channels use Right attenuation
1 = Right Channels use Left Attenuation
Soft mute select
3
SOFTMUTE
IZD
0
0: Normal Operation
1: Soft mute both channels
4
0
Enables infinite zero detect (detects 1024 zeros on input):
0 = Disable infinite zero detect
1 = Enable infinite zero detect
Zero flag output:
6:5
ZEROFLR
[1:0]
00
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
7
AMUTE
0
Applies analogue mute in DSD mode
0 = Normal operation
1 = Analogue mute applied
Table 57 R4 Volume Control Register
REGISTER
ADDRESS
R5
BITS
NAME
DEFAULT
DESCRIPTION
[1:0]
IWL[1:0]
10
Audio interface input word length.
00 = 16-bit
Format
Control
01 = 20-bit
05h
10 = 24-bit
11 = 32-bit
[3:2]
FMT[1:0]
10
Audio data format select.
00 = right justified mode
01 = left justified mode
10 = I2S mode
11 = DSP mode
4
5
6
7
LRP
BCP
0
0
0
0
Polarity select for LRCLK/DSP mode select.
0 = normal LRCLK polarity/DSP mode A
1 = inverted LRCLK polarity/DSP mode B
BCLK / DSD64CLK polarity select:
0 = normal polarity
1 = inverted polarity
REV
Analogue output phase control:
0 = Normal
1 = Inverted
PWDN
Power Down Mode Select:
0 = Normal Mode
1 = Power Down Mode
Table 58 R5 Format Control Register
PD, Rev 4.2, October 2009
46
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
