Appendix C Functional Description C-9
C.5.3.2 PCI IDE Controller
There are two IDE channels within the IDE controller to support up to four devices.
Each channel can operate at DMA mode 4 speed independently. The target devices
are one or two UltraDMA/66 capable hard drives and a DVD-ROM or CD-ROM
drive. The PCI IDE controller:
■ Supports PCI bus mastering at 132 Mbyte/sec transfer rate
■ Includes two separate IDE channels that support ultra 66 high performance ATA
bus for 66-Mbyte transfer rate and concurrent operation
■ Includes dedicated ATA bus pins and buffers for each channel
C.5.3.3 AC97 Compliant Audio Interface
The system audio consists of a single-chip CODEC, integrated amplifier, and
supporting analog circuitry.
The CODEC is a single-chip stereo, analog-to-digital and digital-to-analog converter
based on delta-sigma conversion technique. The microphone input specifications are
designed for the SunMicrophone II or equivalent. The following figure shows a
functional block diagram of the system audio circuit.
FIGURE C-6 Audio Circuit Functional Block Diagram
An internal speaker is connected to the motherboard through the riser card and used
by SW to make “beep” sounds as well as audio sound output.
B
AC 97
MIN_L
MIN_R
LIN_L
LIN_R
Mono
_Out
CODEC
D
E
F
A
Internal
mono
speaker
Line
level
output
(stereo)
Line
level
input
(stereo)
Microphone
level
input
(mono)
Headphone
output
(stereo)
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