CS4297-KQ Cirrus Logic, CS4297-KQ Datasheet - Page 24

• Manufacturer Part Number: CS4297-KQ
• Description: CrystalClear SoundFusion Audio Codec 97
• Manufacturer: Cirrus Logic

PC_BEEP Volume (Index 0Ah)
The PC_BEEP Volume control register controls the mix of the PC_BEEP in the Analog Output Mixer.
Each register step corresponds to 3.0 dB volume adjustment, thus offering a range between 0 dB and 45 dB
of attenuation. The MSB of this register controls a master analog mute for the PC_BEEP. Bits PV3 - PV0
of the register control the actual volume levels.
NOTE: The 4 valid data bits for the PC_BEEP volume control are not aligned to the least significant bits
of the register. Valid data bit 0 (PV0) corresponds to bit D1 of the register. Also, each step of the value
(PV3 - PV0) corresponds to a 3 dB step in volume control, as opposed to all other gain controls, which
have a 1.5 dB step size.
Also note that the default state of the mute bit (bit D15) is ‘cleared’, meaning that the PC_BEEP is un-
muted on power-up.
Phone_In Volume (Index 0Ch)
This register controls the gain level of the Phone_In input source to the Ouput mixer. Each register step
corresponds to a 1.5 dB gain adjustment allowing a range of 12 dB to -34.5 dB of gain. The MSB controls
an analog mute for the Phone_In signal.
The default values for Phone_In is 8008h, corresponding to 0 dB attenuation and mute on.
Microphone Volume (Index 0Eh)
This register controls the gain level of the Mic_In input source to the Input Mixer. It also controls the
+20 dB gain block which connects to the input volume control and to the Input Record Mux. Each register
step (GN4 - GN0) corresponds to a 1.5 dB gain adjustment allowing a range of 12 dB to -34.5 dB of gain.
The 20dB bit, when ‘set’, enables the 20 dB gain block. The MSB controls an analog mute for the Mic_In
signal. The Mic_In source is selected through the General Purpose register
The default values for MIC_IN is 8008h, corresponding to 0 dB attenuation and mute on.
24
Mute
Mute
Mute
D15
D15
D15
D14
D14
D14
X
X
X
D13
D13
D13
X
X
X
D12
D12
D12
X
X
X
D11
D11
D11
X
X
X
D10
D10
D10
X
X
X
D9
D9
D9
X
X
X
D8
D8
D8
X
X
X
D7
D7
D7
X
X
X
CrystalClear™ SoundFusion™ Audio Codec ’97
20dB
D6
D6
D6
X
X
D5
D5
D5
X
X
X
GN4
GN4
PV3
D4
D4
D4
GN3
GN3
PV2
D3
D3
D3
GN2
GN2
PV1
D2
D2
D2
GN1
GN1
PV0
D1
D1
D1
CS4297
DS242F5
GN0
GN0
D0
D0
D0
X