CS42L55 Datasheet, PDF (26/73 Pages) Cirrus Logic – Ultra Low Power, Stereo CODEC w/Class H Headphone Amp

4.4
Analog Outputs
INPUTS FROM ADCA
and ADCB
Fixed Function DSP
AMIXAMUTE
AMIXBMUTE
AMIXAVOL[6:0]
AMIXBVOL[6:0]
PMIXAMUTE
PMIXBMUTE
PMIXAVOL[6:0]
PMIXBVOL[6:0]
VOL
PCMASWAP[1:0]
PCMBSWAP[1:0]
Demph
VOL
Channel
Swap
Channel
Swap
Σ
DEEMPH
INV_PCMA
INV_PCMB
OFFTIME[2:0]
ONTIME[3:0]
FREQ[3:0]
BEEP[1:0]
Beep
Generator
BPVOL[4:0]
VOL
MSTAVOL[7:0]
MSTBVOL[7:0]
Chnl Vol.
Settings
ADCASWAP[1:0]
ADCBSWAP[1:0]
Σ
VOL
MSTAMUTE
MSTBMUTE
DIGSFT
PLYBCKB=A
CS42L55
LIMARATE[7:0]
LIMRRATE[7:0]
LMAX[2:0]
CUSH[2:0]
LIMSRDIS
LIMIT
LIMIT_ALL
Limiter
Peak
Detect
Bass/
Treble/
Control
TC_EN
BASS_CF[1:0]
TREB_CF[1:0]
BASS[3:0]
TREB[3:0]
DAC
* ^PDN_DSP
to HP and
Line MUX
Digital Mix to ADC
Serial Interface
*
MSTxVOL[7:0], MSTxMUTE and DIGSFT are always
available regardless of the PDN_DSP setting.
Figure 12. DSP Engine Signal Flow
Referenced Control
DSP
PDN_DSP
DEEMPH
PMIXxMUTE
PMIXxVOL[6:0]
INV_PCMx
PCMxSWAP[1:0]
AMIXxMUTE
AMIXxVOL[6:0]
ADCxSWAP[1:0]
MSTxVOL[7:0]
MSTxMUTE
DIGSFT
PLYBCKB=A
TC_EN
BASS_CF[1:0]
TREB_CF[1:0]
BASS[3:0]
TREB[3:0]
Limiter
LIMIT
LIMIT_ALL
LIMSRDIS
LMAX[2:0]
CUSH[2:0]
LIMARATE[7:0]
LIMRRATE[7:0]
Beep Generator
Register Location
“Power Down DSP” on page 50
“HP/Line De-Emphasis” on page 50
“PCM Mixer Channel x Mute” on page 52
“PCM Mixer Channel x Volume” on page 52
“Invert PCM Signal Polarity” on page 51
“PCM Mix Channel Swap” on page 60
“ADC Mixer Channel x Mute” on page 51
“ADC Mixer Channel x Volume” on page 51
“ADC Mix Channel Swap” on page 60
“Master Volume Control” on page 57
“Master Playback Mute” on page 51
“Digital Soft Ramp” on page 46
“Playback Channels B=A” on page 50
“Tone Control Enable” on page 56
“Bass Corner Frequency” on page 56
“Treble Corner Frequency” on page 55
“Bass Gain” on page 56
“Treble Gain” on page 56
“Peak Detect and Limiter” on page 61
“Peak Signal Limit All Channels” on page 61
“Limiter Soft Ramp Disable” on page 66
“Limiter Maximum Threshold” on page 60
“Limiter Cushion Threshold” on page 61
“Limiter Attack Rate” on page 62
“Limiter Release Rate” on page 62
Refer to “Beep Generator” on page 31 for all referenced controls
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DS773F1