CS4297 datasheet(24/46 Pages) CIRRUS

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DS242F5

CS4297

CrystalClear™ SoundFusion™ Audio Codec ’97

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.

D15

D14

D13

D12

D11

D10

Mute

PV3

PV2

PV1

PV0

D15

D14

D13

D12

D11

D10

Mute

GN4

GN3

GN2

GN1

GN0

D15

D14

D13

D12

D11

D10

Mute

20dB

GN4

GN3

GN2

GN1

GN0

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