cs4237b Cirrus Logic, Inc., cs4237b Datasheet - Page 59

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

Mixer Data Register,
SBbase+5
This register provides read/write access to a par-
ticular mixer register depending on the index
address specified in the Mixer Address Register.
Reset
SBbase+6, write only
When bit D[0] of this register is set to a one and
then set to a zero, a reset of the Sound Blaster
interface will occur.
Read Data Port
SBbase+A, read only
When bit D[7] of the Data Available Register,
SBbase+E, is set =1 then valid data is available
in this register. The data may be the result of a
Command that was previously written to the
Command/Write Data Register or digital audio
data.
Command/Write Data
SBbase+C, write only
The Command/Write Data register is used to
send Sound Blaster Pro commands.
Write Buffer Status,
SBbase+C, read only
The Write Buffer Status register bit D[7] indi-
cates when the SBPro interface is ready to
accept another command to the Command/Write
Data register. D[7]=1 indicates ready. D[7]=0 in-
dicates not ready.
Sound Blaster Mixer Registers
The Sound Blaster mixer registers are shown in
Table 20. The Sound Blaster mixer to WSS
Codec mixer mapping is shown in Figure 5.
Reset Register,
Mixer Index 00H
Writing any value to this register will reset the
mixer to default values.
DS213PP4
Voice Volume Register,
Mixer Index 04H, Default = 99H
This register provides 8 steps of voice volume
control each for the right and left channels.
Microphone Mixing Register,
Mixer Index 0AH, Default = 01H
This register provides 4 steps of microphone vol-
ume control.
Input Control Register,
Mixer Index 0CH
This register selects the input source to the ADC.
Output Control Register,
Mixer Index 0EH
Master Volume Register,
Mixer Index 22H, Default = 99H
This register provides 8 steps of master volume
control each for the right and left channels.
FM Volume Register,
Mixer Index 26H, Default = 99H
This register provides 8 steps of FM volume
control each for the right and left channels.
CD Volume Register,
Mixer Index 28H, Default = 01H
This register provides 8 steps of CD volume
control each for the right and left channels.
Line-In Volume Register,
Mixer Index 2EH, Default = 01H
This register provides 8 steps of line-in volume
control each for the right and left channels.
D2,D1 -
VSTC -
00 - Microphone
01 - CD Audio
10 - Microphone
11 - Line In
0 - Mono Mode
1 - Stereo Mode
CS4237B
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