cs4237b Cirrus Logic, Inc., cs4237b Datasheet - Page 38

• Manufacturer Part Number: cs4237b
• Description: Crystalclear Advanced Audio System With 3d Sound
• Manufacturer: Cirrus Logic, Inc.

Right DAC (PC Wave) Volume (I7)
Default = 10000000
RDOM RDG6 RDG5
If both IFM (X4 or Global Config. byte) and WTEN
(C8 or Global Config. byte) are cleared, this register
is the master digital audio volume for the right chan-
nel with the following bit definitions:
RDG6-RDG0
RDOM
If IFM or WTEN is set, this register controls the right
channel volume for data coming from the ISA bus
only (and X15 is the right channel digital audio mas-
ter volume) with the following bit descriptions.
RPA5-RPA0
res
RPM
Fs and Playback Data Format (I8)
Default = 00000000
C2SL
38
RPM
FMT1
D7
D7
D6
res
FMT0
D6
RPA5
D5
D5
C/L
Right DAC Master Volume. The least
significant bit represents 1.5 dB, with
0000000 = 0 dB. The total range is
+12 to -94.5 dB. See Table 12.
Right DAC Master Mute. When set,
the right DAC to the output mixer is
muted.
Right PC Wave Attenuation. The least
significant bit represents -1.5 dB,
with 000000 = 0 dB. The total range
is 0 to -94.5 dB. See Table 6.
Reserved. Must write 0. Could read
as 0 or 1.
Right PC Wave Mute. When set, the
right PCM input to the digital mixer
summer will be muted.
Clock 2 Source Select: This bit selects
the clock base used for the audio
sample rates for both capture and
playback. Note that this bit can be
disabled by setting SRE in I22 or by
setting IFSE in X11.
CAUTION: C2SL can only be
changed while MCE (R0) is set.
RDG4
RPA4
D4
S/M
D4
RDG3
RPA3
D3
CFS2
D3
RDG2
RPA2
D2
CFS1
D2
RDG1
RPA1
CFS0
D1
D1
RDG0
RPA0
C2SL
D0
D0
CFS2-CFS0
S/M
0 - 3072
1 - 1536
2 - 896
3 - 768
4 - 448
5 - 384
6 - 512
7 - 2560
DIVIDE
See Table below.
Clock Frequency Divide Select: These
bits select the audio sample fre-
quency for both capture and
playback. The actual audio sample
frequency depends on which clock
base (C2SL) is selected. Note that
these bits can be disabled by setting
SRE in I22 or IFSE in X11.
CAUTION: CFS2-CFS0 can only be
changed while MCE (R0) is set.
Stereo/Mono Select: This bit deter-
mines how the audio data streams
are formatted. Selecting stereo will
result in alternating samples repre-
senting left and right audio channels.
Mono playback plays the same
audio sample on both channels.
Mono capture only captures data
from the left channel. In MODE 1,
this bit is used for both playback and
capture. In MODEs 2 and 3, this bit
is only used for playback, and the
capture format is independently se-
lected via I28. MCE (R0) or PMCE
(I16) must be set to modify S/M.
See Changing Audio Data Formats
section for more details.
27.42 kHz
C2SL = 0
16.0 kHz
32.0 kHz
48.0 kHz
8.0 kHz
9.6 kHz
N/A
N/A
11.025 kHz
33.075 kHz
22.05 kHz
C2SL = 1
5.51 kHz
18.9 kHz
37.8 kHz
44.1 kHz
6.62 kHz
CS4237B
DS213PP4