STAC9766 Datasheet, PDF (82/97 Pages) Integrated Device Technology – TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING

STAC9766/9767
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING
PC AUDIO
Figure 23. Powerdown/Powerup Flow With Analog Still Alive
PR0=1
PR1=1
PR4=1
Normal
ADCs off PR0 DACs off PR1
Digital I/F off
PR4
Shut off
AC-Link
PR0=0 & ADC=1 PR1=0 & DAC=1
Warm Reset
Figure 23 illustrates a state when all the mixers work with the static volume settings that are con-
tained in their associated registers. This configuration can be used when playing a CD (or external
LINE_IN source) through STAC9766/9767 to the speakers, with most of the system in low power
mode. The procedure for this follows the previous example except that the analog mixer is never
shut down.
IDT™
82
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH STEREO MICROPHONE AND MIC/JACK SENSING
STAC9766/9767
V 7.4 12/06