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The SDRAM parameters (items 2~5) become configurable only when
you set the SDRAM Configuration to [User Defined].
SDRAM CAS Latency [3T]
This item controls the latency between the SDRAM read command and
the time the data actually becomes available.
SDRAM RAS to CAS Delay [3T]
This item controls the latency between the DDR SDRAM active command
and the read/write command.
SDRAM RAS Precharge Time [3T]
This item controls the idle clocks after issuing a precharge command to
the DDR SDRAM.
SDRAM RAS Active Time [6T]
This item controls the number of DDR SDRAM clocks used for DDR
SDRAM parameters.
Graphics Aperture Size [64MB]
This feature allows you to select the size of mapped memory for AGP
graphic data. Configuration options: [4MB] [8MB] [16MB] [32MB] [64MB]
[128MB] [256MB] [512MB]
Onboard VGA Shared Memory Size [32MB]
This field allows you set the onboard VGA shared memory size with the
currently installed memory. Configuration options: [8MB] [16MB] [32MB]
[64MB]
Video Memory Cache Mode [UC]
USWC (uncacheable, speculative write combining) is a new cache
technology for the video memory of the processor. It can greatly improve
the display speed by caching the display data. You must set this to UC
(uncacheable) if your display card does not support this feature, otherwise
the system may not boot. Configuration options: [UC] [USWC]
Delayed Transaction [Enabled]
When set to [Enabled], this feature frees the PCI bus when the CPU is
accessing 8-bit ISA cards. This process normally consumes about 50-60
PCI clocks without PCI delayed transaction. Set this field to [Disabled]
when using ISA cards that are not PCI 2.1 compliant. Configuration
options: [Enabled] [Disabled]
2-16
Chapter 2: BIOS Information
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