Cs4205 – Cirrus Logic CS4205 User Manual

Page 34

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CS4205

DS489PP4

5.12

General Purpose Register (Index 20h)

POP

PCM Out Path. When ‘clear’, the PCM out path is mixed pre 3D. When ‘set’, the PCM out path

is mixed post 3D.

Stereo Enhancement Enable. When ‘set’, the ST bit enables the simulated stereo enhance-

ment via the SRS Mono algorithm.

3D Enable. When ‘set’, the 3D bit enables the 3D stereo enhancement via the SRS Stereo

algorithm.

Loudness Enable. When ‘set’, the LD bit enables the loudness or “bass boost” via the equal-

izer algorithm.

MIX

Mono Output Path. This bit controls the source of the mono output driver. When ‘clear’, the

output of the stereo-to-mono mixer is sent to the mono output. When ‘set’, 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 ‘set’, the MIC2 input is selected. When ‘clear’, the MIC1 input is selected.

LPBK

Loopback Enable. When ‘set’, 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)

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)

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.

D15

D14

D13

D12

D11

D10

POP

MIX