cs4297 Cirrus Logic, Inc., cs4297 Datasheet - Page 23

• Manufacturer Part Number: cs4297
• Description: Crystalclear Soundfusion Audio Codec 97 Logic
• Manufacturer: Cirrus Logic, Inc.

DS242F5
Reset Register (Index 00h)
Any write to this register causes a Register Reset of the AC’97 Registers to occur. This forces all registers
to return to their default state. Reads from the Reset Register will return configuration information about
the part. The CS4297 supports 18-bit DAC and ADC digital audio channels and the Headphone Output (in
the form of the Alternate Line Output). The value read from this register will always be 0x0150h.
Master Volume (Index 02h)
The Master Volume control register controls the LINE_OUT signal’s volume. Each register step corre-
sponds to 1.5 dB volume adjustment, thus offering a range between 0 dB and 94.5 dB of attenuation.
Mute - The MSB of this register controls a master analog mute for the LINE_OUT_L and the
LINE_OUT_R output signals.
ML5 - ML0 - These bits control the left channel’s volume
MR5 - MR0 - These bits control the right channel’s volume.
The default value for this register is 8000h, corresponding to 0 dB attenuation and mute on.
Alternate Volume (Index 04h)
The Alternate Volume control register is used to control the ALT_LINE_OUT signal’s volume. Each reg-
ister step corresponds to 1.5 dB volume adjustment, thus offering a range between 0 dB and 94.5 dB of
attenuation.
Mute - The MSB of this register controls a master analog mute for the ALT_LINE_OUT_L and the
ALT_LINE_OUT_R output signals.
ML5 - ML0 - These bits control the left channel’s volume.
MR5 - MR0 - These bits control the right channel’s volume.
The default value for this register is 8000h, corresponding to 0 dB attenuation and mute on.
Master Mono Volume (Index 06h)
The Master Mono Volume control register controls the MONO_OUT signal’s volume. Each register step
corresponds to 1.5 dB volume adjustment, thus offering a range between 0 dB and 94.5 dB of attenuation.
The MSB of this register controls a master analog mute for the MONO_OUT. Bits MM5 - MM0 of the
register are used to control the actual volume levels.
The default value for this register is 8000h, corresponding to 0 dB attenuation and mute on.
CS4297
CrystalClear™ SoundFusion™ Audio Codec ’97
Mute
Mute
Mute
D15
D15
D15
D14
D14
D14
X
X
X
D13
ML5
D13
ML5
D13
X
ML4
ML4
D12
D12
D12
X
ML3
ML3
D11
D11
D11
X
D10
ML2
D10
ML2
D10
X
ML1
ML1
D9
D9
D9
X
ML0
ML0
D8
D8
D8
X
D7
D7
D7
X
X
X
D6
D6
D6
X
X
X
MM5
MR5
MR5
D5
D5
D5
MM4
MR4
MR4
D4
D4
D4
MM3
MR3
MR3
D3
D3
D3
MM2
MR2
MR2
D2
D2
D2
MM1
MR1
MR1
D1
D1
D1
MR0
MR0
MM0
D0
D0
D0
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