CS4237B Datasheet, PDF (46/114 Pages) Cirrus Logic – CrystalClear Advanced Audio System with 3D Sound

res
Reserved. Must write 0. Could read
as 0 or 1.
The PI, CI, and TI bits are reset by writing a "0"
to the particular interrupt bit or by writing any
value to the Status register (R2).
Compatibility ID (I25)
Default = 00000011
D7 D6 D5 D4 D3 D2 D1 D0
V2
V1 V0 CID4 CID3 CID2 CID1 CID0
CID4-CID0
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.
All Chips:
00011 - CS4236, CS4237B
00010 - CS4232/CS4232A
00000 - CS4231/CS4231A
V2-V0
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 and Output Control (I26)
Default = 101x0000
D7 D6 D5 D4
MIM MOM MBY res
D3 D2 D1 D0
MIA3 MIA2 MIA1 MIA0
MIA3-MIA0
Mono Input Attenuation. When MIM
is 0, these bits set the level of MIN
res
MBY
MOM
MIM
CS4237B
summed into the mixer. MIA0 is the
least significant bit and represents
3 dB attenuation, with 0000 = 0 dB.
See Table 7.
Reserved. Must write 0. Could read
as 0 or 1.
Mono Bypass. MBY connects MIN
directly to MOUT with an attenuation
of 9 dB. When MBY = 1, MIM
should be set to 1.
0 - MIN not connected directly to
MOUT.
1 - MIN connected directly to MOUT.
Mono Output Mute. In MODE 3, MOM
will mute the left Line Out to the
mono mix output, MOUT. The right
Line Out mute, MOMR, is in X5. In
MODE 2, MOM mutes left and right
Line Out to MOUT. This mute is inde-
pendent of the line output mute.
0 - no mute
1 - mute
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
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