CS4205_05 Datasheet, PDF(34/81 Page) Cirrus Logic – CrystalClear® Audio Codec ’97 for Portable Computing

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CS4205_05 Datasheet, PDF (34/81 Pages) Cirrus Logic – CrystalClear® Audio Codec ’97 for Portable Computing

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CS4205

5.12 General Purpose Register (Index 20h)

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

POP ST 3D LD

0 MIX MS LPBK 0

POP

PCM Out Path. When âclearâ, the PCM out path is mixed pre 3D. When âsetâ, the PCM out path

is mixed post 3D.

Stereo Enhancement Enable. When âsetâ, the ST bit enables the simulated stereo enhance-

ment via the SRS Mono algorithm.

3D Enable. When âsetâ, the 3D bit enables the 3D stereo enhancement via the SRS Stereo

algorithm.

Loudness Enable. When âsetâ, the LD bit enables the loudness or âbass boostâ via the equal-

izer algorithm.

MIX

Mono Output Path. This bit controls the source of the mono output driver. When âclearâ, the

output of the stereo-to-mono mixer is sent to the mono output. When âsetâ, the output of the

microphone boost stage is sent to the mono output. The source of the stereo-to-mono mixer

is controlled by the TMM bit in the AC Mode Control Register (Index 5Eh). The source of the

microphone boost stage is controlled by the MS bit in the General Purpose Register

(Index 20h).

Microphone Select. The MS bit determines which of the two Mic inputs are passed to the mix-

er. When âsetâ, the MIC2 input is selected. When âclearâ, the MIC1 input is selected.

LPBK

Loopback Enable. When âsetâ, the LPBK bit enables the ADC/DAC Loopback Mode. This bit

routes the output of the ADCs to the input of the DACs without involving the AC-link.

Default

0000h

5.13 3D Control Register (Index 22h)

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

0 CR3 CR2 CR1 CR0 0

0 DP3 DP2 DP1 DP0

CR[3:0]

Center Control. The CR[3:0] bits control the amount of the sum signal, (L+R), that is added

to the final left and right digital signals.

DP[3:0]

Depth Control. The DP[3:0] bits control the amount of processed difference signal, (L-R)p,

that is added to the final left and right digital signals.

Default

0000h. This value corresponds to -22.5 dB center and depth attenuation.

This register is used to control the center and depth of the SRS stereo enhancement function in the effects engine.

Each step corresponds to 1.5 dB gain adjustment, with a total available range from 0 dB to -22.5 dB attenuation.

The recommended starting point for listening is -12 dB center attenuation and -4.5 dB depth attenuation, a register

value of 070Ch.

DS489PP4

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