Chapter 3 — Theory of Operation
62 CV30 Fixed Mount Computer Service Manual
Audio System Block Diagram
AC97 CODEC Interface
The main processor has an AC97 CODEC interface that is comprised of
the following five signals:
• AC97_SD_OUT: Serial data from processor to the CODEC
• AC97_BIT_CLK: Clock from the CODEC to the main processor
• AC97_SD_IN: Serial data from CODEC to the processor
• AC97_SYNC: Synchronizing signal, places the CODEC in different
modes
• AC97_RESET: Main processor resets the CODEC
This serial interface runs at approximately 12MHz. All audio digitized by
the CODEC A2Ds is sent over this link (for example, audio recording). All
digital audio to be converted to audio (such as MP3 decoded file) is sent
over this link.
AC97 CODEC
The CODEC is comprised of the following functions:
• Stereo A2D converters with variable rate sampling.
• Stereo D2A converters with variable sample rate play.
BT AUDIO
HEADSET
RF LINK
UART
801.11b/
RADIO
BLUETOOTH
RADIO
BULVERDE
AC97
HEADSET
JACK
LOUD
SPEAKER
CLASS D
AMP
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