90
M
M
X
X
4
4
6
6
U
U
2
2
O
O
n
n
l
l
i
i
n
n
e
e
M
M
a
a
n
n
u
u
a
a
l
l
G
G
l
l
o
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
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
r
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
e
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
. 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
register interface. ACPI defines ATX momentary soft power switch to control the power state
transition.
A
A
G
G
P
P
(
(
A
A
c
c
c
c
e
e
l
l
e
e
r
r
a
a
t
t
e
e
d
d
G
G
r
r
a
a
p
p
h
h
i
i
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.
