90
M
M
X
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4
4
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R
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n
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l
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i
n
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M
M
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u
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l
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o
s
s
s
s
a
a
r
r
y
y
A
A
C
C
9
9
7
7
Basically, AC97 specification separates sound/modem circuit to two parts, digital processor and a CODEC for analogy I/O they are
linked by AC97 link bus. Since digital processor can be put into motherboard main chipset, the cost of sound/modem onboard
solution can be reduced.
A
A
C
C
P
P
I
I
(
(
A
A
d
d
v
v
a
a
n
n
c
c
e
e
d
d
C
C
o
o
n
n
f
f
i
i
g
g
u
u
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r
a
a
t
t
i
i
o
o
n
n
&
&
P
P
o
o
w
w
e
e
r
r
I
I
n
n
t
t
e
e
r
r
f
f
a
a
c
c
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e
)
)
ACPI is the power management specification of PC97 (1997). It intends to save more power by taking full control of power
management to operating system and bypass
BIOS
. The chipset or super I/O chip needs to provide standard register interface to
operating system (such as Windows 98). This is a bit similar as the
PnP
register interface. ACPI defines ATX momentary soft power
switch to control the power state transition.
A
A
G
G
P
P
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(
A
A
c
c
c
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l
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r
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a
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d
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G
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r
a
a
p
p
h
h
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c
c
P
P
o
o
r
r
t
t
)
)
AGP is a bus interface targeted for high-performance 3D graphic. AGP supports only memory read/write operation and
single-master single-slave one-to-one only. AGP uses both rising and falling edge of the 66MHz clock, for 2X AGP, the data transfer
rate is 66MHz x 4byte x 2 = 528MB/s. AGP is now moving to 4X mode, 66MHz x 4byte x 4 = 1056MB/s. AOpen is the first company
to support 4X AGP motherboards by both AX6C (Intel 820) and MX64/AX64 (VIA 694x), started from Oct 1999.
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