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Appendix C Functional Description C-29
The audio connector supports the following:
■ Nine Codec address lines
■ Eight Codec data lines
■ Control lines: Write, read, Codec chip select, PROM chip select, reset
■ Codec DMA support signals: playback request, playback acknowledge, capture
request, and capture acknowledge
■ Codec power down line
■ Audio analog lines: DC volume control line
■ Audio present
■ Power/ground: Two +12 Vdc lines, one -12 Vdc line, one Vcc line, five digital
grounds, and four analog grounds
■ Two spare pins
FIGURE C-9 Audio Card Functional Block Diagram
Codec
LINL
LINR
MONO_OUT
A
B
D
E
F
Line level out
(stereo)
Headphone
out (stereo)
Line level
input (stereo)
Mono
speaker
C
LOUT L
E1
F1
Line Out
mute control
Headphone
mute control
G
CD-ROM drive
(Internal/optional)
EBus Interface
Microphone level
input (stereo)
MINL
MINR
Aux 1 L
Aux 1 R
LOUT R
LOUT L
LOUT R