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SDRAM CAS Latency
This option determines the CAS latency time parameter of SDRAM.
The settings are 2 clks or 3 clks.
SDRAM RAS Precharge Time
This option defines the RAS# precharge requirements for the
SDRAM memory type in 66MHz clocks.
Fixed Memory Hole
This option allows the end user to specify the location of a memory
hole. The cycle matching the selected memory hole will be passed to the
ISA bus. If Enabled, the selected hole is not remapped.
AGP Aperture Size
This option determines the effective size of the graphics aperture
used in the particular PAC configuration. The AGP aperture is memory-
mapped, while graphics data structure can reside in a graphics aperture. The
aperture range should be programmed as not cacheable in the processor
cache, accesses with the aperture range are forwarded to the main memory,
then PAC will translate the original issued address via a translation table
that is maintained on the main memory. The option allows the selection of
an aperture size of 4MB, 8MB, 16MB, 32MB, 64MB, 128MB, and 256MB.
USB Passive Release
During Enabled, this will allow the PIIX4
®
at PIIX4
Passive Release) while transferring control information or data for
USB transaction. During Disabled, PIIX4
without using passive release.
®
®
to use passive release(look
®
will perform PCI accesses for USB
4-12
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