STAC9708 Datasheet, PDF (23/56 Pages) List of Unclassifed Manufacturers – Multi-Channel AC97 Codec With Multi-Codec Option

SigmaTel, Inc.
Preliminary
STAC9708/11
Warm Reset - a warm reset will re-activate the AC-Link without altering the current STAC9708/11
register values. A warm reset is signaled by driving SYNC high for a minimum of 1us in the absence of
BIT_CLK.
Note: Within normal audio frames, SYNC is a synchronous input. However, in the absence
of BIT_CLK, SYNC is treated as an asynchronous input used in the generation of a warm
reset to the STAC9708/11.
4. STAC9708/11 MIXER
The STAC9708/11 mixer is designed to the AC'97 specification to manage the playback and record of all digital
and analog audio sources in the PC environment. These include:
• System Audio: digital PCM input and output for business, games and multimedia
• CD/DVD: analog CD/DVD-ROM Redbook audio with internal connections to Codec mixer
• Mono microphone: choice of desktop mic, with programmable boost and gain
• Speakerphone: use of system mic and speakers for telephone, DSVD, and video conferencing
• Video: TV tuner or video capture card with internal connections to Codec mixer
• AUX/synth: analog FM or wavetable synthesizer, or other internal source
Figure 11. STAC9708/11 Mixer Functional Diagram
PCM out
Surround
D/A
PCM out
D/A
PC_BEEP
Phone
Analog Audio
Sources
KEY
Mono Analog
MIC1
MIC2
LINE IN
CD
Video
AUX
Stereo Analog
Digital
20dB
vol mute
vol mute
vol mute
vol mute
vol mute
Σ
vol mute
vol mute
vol mute
vol mute _{-6 dB}
Σ
3D DAC
Volume
3D _Master
-6 dB
Volume
Σ
M
U
X
Mono
Volume
M
U
Master
Input
A/D
X
Volume ^A/D
DAC OUT
LINE OUT
MONO OUT
PCM IN
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10/02/98