cs4237b Cirrus Logic, Inc., cs4237b Datasheet - Page 52

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

Left MIC Volume (X2)
Default = 11001111
LMG4-LMG0
LMBST
LMOM
LMIM
LMIC
Right MIC Volume (X3)
Default = 11001111
RMG4-RMG0
RMBST
RMOM
RMIM
52
Input
RMIM RMOM RMBST RMG4 RMG3 RMG2 RMG1 RMG0
LMIM LMOM LMBST LMG4
D7
D7
+22.5 to -22.5 dB
LMG4-G0
D6
D6
D5
D5
Left Microphone Gain.
The least significant bit represents
1.5 dB, with 01111 = 0 dB.
Left Microphone 20 dB boost.
When set to 1, the signal to the out-
put mixer is given a 20 dB boost.
Left Microphone Output Mixer Mute.
When set to 1, the signal to the out-
put mixer is muted.
Left Microphone Input Mixer Mute.
When set to 1, the signal to the in-
put mixer is muted.
Right Microphone gain.
The least significant bit represents
1.5 dB, with 01111 = 0 dB.
See Table 13.
Right Microphone 20 dB boost.
When set to 1, the signal to the out-
put mixer is given a 20 dB boost.
Right Microphone Output Mixer Mute.
When set to 1, the signal to the out-
put mixer is muted.
Right Microphone Input Mixer Mute.
When set to 1, the signal to the in-
put mixer is muted.
See Table 13.
LMOM
D4
LMIM
D4
LMG3
LMBST
D3
D3
LMG2
D2
+20 dB
D2
LMG1
D1
D1
To Output
To Input
Mixer
Mixer
LMG0
D0
D0
RMIC
Synthesis and Input Mixer Control (X4)
Default = 100001xx
res
FMRM
WTRMD
IFM
Input
MIMR LIS1
D7
+22.5 to -22.5 dB
RMG4-G0
D6
LIS0
D5
Reserved. Must write 0. Could be
read as 0 or 1.
FM Volume Control Remap. This bit
only functions when IFM = 1.
If FMRM = 1, internal FM Synthesis
volume is controlled by I18/I19
(writes to I18/I19 get remapped to
X6/X7). Analog LINE volume is con-
trolled by X0/X1.
If FMRM = 0, internal FM synthesis
volume is controlled by X6/X7 only.
WaveTable Volume Remap Disable.
This bit only functions when
WTEN = 1 (C8/Global Config. byte).
If WTRMD = 0, the Wavetable Serial
Port volume is controlled by I18/I19
(writes to I18/I19 get remapped to
X16/X17). Analog LINE volume is
controlled by X0/X1.
If WTRMD = 1, the Wavetable Serial
Port volume is controlled by
X16/X17 only.
NOTE: If FMRM = 1, and
WTRMD = 0, I18/I19 control both in-
ternal FM and Wavetable Serial Port
volume.
Internal FM enable. When set to 1,
the internal FM synthesis engine is
enabled. Setting this bit also
changes I6/7 from the master digital
audio volume to the ISA bus wave
volume control. X14/15 becomes the
IFM
D4
RMOM
RMIM
WTRMD
D3
RMBST
FMRM
+20 dB
D2
CS4237B
DS213PP4
D1
res
To Output
To Input
Mixer
Mixer
D0
res