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M
X
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M
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G G G G
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Basically, AC97 specification separates sound/modem circuit to two parts, digital processor and a
CODEC
for analog 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.
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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
switch to control the power state transition.
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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
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register interface. ACPI defines ATX momentary soft power
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