cs4239 Cirrus Logic, Inc., cs4239 Datasheet - Page 43

• Manufacturer Part Number: cs4239
• Description: Crystalclear? Ortable Isa Audio System Logic
• Manufacturer: Cirrus Logic, Inc.

Compatibility ID (I25)
Default = 00000011
CID4-CID0
All Chips:
V2-V0
Mono Input Control (I26)
Default = exxxeeee
MIA3-MIA0
DS253PP2
MIM
D7
D7
V2
D6
D6
rbc
V1
D5
D5
V0
rbc
Chip Identification. Distinguishes
between this chip and previous
codec chips that support this register
set. This register is fixed to indicate
code compatibility with the CS4236.
X25 or C1 should be used to further
differentiate between parts that are
compatible with the CS4236.
00011 - CS4236, CS423xB, CS4239
00010 - CS4232/CS4232A
00000 - CS4231/CS4231A
Version number. As enhancements
are made to the part, the version
number is changed so software can
distinguish between the different ver-
sions.
000 - Compatible with the CS4236
These bits are fixed for compatibility
with the CS4236. Register X25 or
C1 may be used to differentiate be-
tween the CS4236 and newer chips.
Mono Input Attenuation. When MIM
is 0, these bits set the level of MIN
summed into the mixer. These bits
are initialized through the Hardware
Configuration data, Serial Port Con-
trol byte.
0000 = 0 dB.
0001-1111 = -9 dB
CID4
D4
D4
res
CID3
MIA3
D3
D3
CID2
MIA2
D2
D2
CID1
MIA1
D1
D1
CID0
MIA0
D0
D0
MIM
Left Master Output Volume (I27)
Default = 00100011
When Hardware Volume is enabled, VCEN in C8 or
X24 is set, this register will change based on external
buttons.
LOG4-LOG0
LOS1,0
LOM
LOM
D7
LOS1
D6
CrystalClear Portable ISA Audio System
LOS0
D5
Mono Input Mute. In MODE 3, MIM
mutes the MIN analog input to the
left output mixer channel. MIMR in
X4 mutes MIN analog input to the
right output mixer channel. In
MODE 2, MIM mutes both left and
right channels. The mono input pro-
vides mix for the "beeper" function in
most personal computers. This bit is
initialized through the Hardware Con-
figuration data, Serial Port Control
byte.
0 - no mute
1 - muted
LOG0 is the least significant bit and
represents -2 dB, with 00011 = 0 dB.
The span is nominally +6 dB to
-56 dB. See Table 9.
Left Output Mixer Select. These bits
select and attenuation into the left
output Master Gain stage, LOG4-0.
00 - -16 dB
01 - 0 dB
10 - -8 dB
11 - -24 dB
Left Output Mute. When set to 1,
the left output, LOUT, is muted.
Left Output, LOUT, Master Gain.
LOG4
D4
TM
LOG3
D3
LOG2
D2
LOG1
D1
CS4239
LOG0
D0
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