STAC9721 Datasheet, PDF (30/48 Pages) List of Unclassifed Manufacturers – Stereo AC 97 Codec With Multi-Codec Option

SigmaTel, Inc.
Data Sheet
STAC9721
Figure 12. STAC9721/23 Powerdown/Powerup flow with analog still alive
PR0=1
PR1=1
PR4=1
Normal
ADCs off
PR0
DACs off
PR1
PR0=0
&
ADC=1
PR1=0
&
DAC=1
Digital I/F
off PR4
Warm Reset
Shut off
Coda-link
The above figure illustrates a state when all the mixers should work with the static volume settings that
are contained in their associated registers. This configuration can be used when playing a CD (or external
LINE_IN source) through STAC9721/23 to the speakers, while most of the system in low power mode.
The procedure for this follows the previous except that the analog mixer is never shut down.
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