DS1113F1
87
CS4399
7.5 Analog Output and PCM Registers
7.5.2
PCM Filter Option
Address 0x90000
R/W
7
6
5
4
3
2
1
0
FILTER_
SLOW_FASTB
PHCOMP_
LOWLATB
NOS
—
HIGH_PASS
DEEMP_ON
Default
0
0
0
0
0
0
1
0
Bits
Name
Description
7
FILTER_
SLOW_
FASTB
Fast and slow filter selection.
0 (Default) Fast filter is selected.
1 Slow filter is selected.
6
PHCOMP_
LOWLATB
Low-latency and phase-compensated filter selection
0 (Default) Low-latency is selected.
1 Phase-compensated filter is selected.
5
NOS
Nonoversampling emulation mode on. When enabled, FILTER_SLOW_FASTB and PHCOMP_LOWLATB are ignored.
0 (Default) NOS emulation mode is off.
1 NOS emulation mode is on.
4:2
—
Reserved
1
HIGH_PASS High-pass filter enable.
0 High-pass filter is disabled.
1 (Default) High-pass filter is selected.
0
DEEMP_ON Deemphasis filter on.
0 (Default) Deemphasis for 44.1 kHz is disabled.
1 Deemphasis for 44.1 kHz is enabled.
7.5.3
PCM Volume B
Address 0x90001
R/W
7
6
5
4
3
2
1
0
PCM_VOLUME_B
Default
0
1
1
1
1
0
0
0
Bits
Name
Description
7:0
PCM_
VOLUME_B
Digital volume control registers for PCM channel B. It allows independent control of the signal level in 1/2 dB increments
from 0 to –127 dB. Volume settings are decoded as shown below. The volume changes are dictated by the PCM_SZC
bits. The same rule applies to PCM_VOLUME_A setting.
0000 0000 0 dB
0000 0001 –0.5 dB
...
01111000 –60 dB (Default)
...
1111 1110 –127 dB
1111 1111 Digital mute
7.5.4
PCM Volume A
Address 0x90002
R/W
7
6
5
4
3
2
1
0
PCM_VOLUME_A
Default
0
1
1
1
1
0
0
0
Bits
Name
Description
7:0
PCM_
VOLUME_A
Digital volume control registers for channel A. See PCM_VOLUME_B for description.