wm8742 Wolfson Microelectronics plc, wm8742 Datasheet - Page 46

• Manufacturer Part Number: wm8742
• Description: 24-bit 192khz Dac With Advanced Digital Filtering
• Manufacturer: Wolfson Microelectronics plc

WM8742
Table 57 R4 Volume Control Register
Table 58 R5 Format Control Register
w
REGISTER
REGISTER
ADDRESS
ADDRESS
Volume
Control
Format
Control
04h
05h
R4
R5
BITS
BITS
[1:0]
[3:2]
6:5
0
1
2
3
4
7
4
5
7
6
VOL_RAMP
SOFTMUTE
ZEROFLR
FMT[1:0]
ATT2DB
IWL[1:0]
AMUTE
PWDN
NAME
NAME
ATC
BCP
[1:0]
LRP
REV
IZD
DEFAULT
DEFAULT
00
10
10
0
0
0
0
0
0
0
0
0
0
DESCRIPTION
Ramps volume from existing attenuation setting to new setting when
UPDATE applied.
0: Step volume change
1: Ramp volume change
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
0: Normal Operation
1: Soft mute both channels
Enables infinite zero detect (detects 1024 zeros on input):
0 = Disable infinite zero detect
1 = Enable infinite zero detect
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
Applies analogue mute in DSD mode
0 = Normal operation
1 = Analogue mute applied
DESCRIPTION
Audio interface input word length.
00 = 16-bit
01 = 20-bit
10 = 24-bit
11 = 32-bit
Audio data format select.
00 = right justified mode
01 = left justified mode
10 = I2S mode
11 = DSP mode
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
Analogue output phase control:
0 = Normal
1 = Inverted
Power Down Mode Select:
0 = Normal Mode
1 = Power Down Mode
PD, Rev 4.2,August 2009
Production Data
46