Specifications

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9
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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
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C
P
P
I
I
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(
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d
d
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v
a
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n
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e
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d
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f
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g
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u
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r
a
a
t
t
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i
o
o
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w
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I
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)
)
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
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G
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P
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A
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c
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c
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e
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l
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e
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r
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a
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t
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e
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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.