user manual

ASUS K7V-T User’s Manual66

4. BIOS SETUP

Chip Configuration

SDRAM CAS Latency

This controls the latency between the SDRAM read command and the time

that the data actually becomes available. NOTE: This field will only be dis-

played when SDRAM Configuration is set to [User Define].

SDRAM RAS Precharge Time

This controls the idle clocks after issuing a precharge command to the

SDRAM. NOTE: This field will only be displayed when SDRAM Con-

figuration is set to [User Define].

SDRAM RAS to CAS Delay

This controls the latency between the SDRAM active command and the

read/write command. NOTE: This field will only be displayed when

SDRAM Configuration is set to [User Define].

Delayed Transaction [Enabled]

Enabled, this frees the PCI Bus when the CPU is accessing 8-bit ISA cards

that normally consume about 50-60 PCI Clocks without PCI delayed trans-

action. Select [Disabled] for ISA cards that are not PCI 2.1 compliant. Con-

figuration options: [Enabled] [Disabled]

PCI to DRAM Prefetch [Enabled]

Configuration options: [Disabled] [Enabled]

Byte Merge [Disabled]

To optimize the data transfer on PCI, this merges a sequence of individual

memory writes (bytes or words) into a single 32-bit block of data. However,

byte merging may only be done when the bytes within a data phase are in a

prefetchable address range. Configuration options: [Disabled] [Enabled]

DRAM Read Latch Delay [0.5 ns]

Configuration options: [0.0 ns] [0.5 ns] [1.0 ns] [2.0 ns]

DRAM Interleave Setting [Auto]

Configuration options: [Auto] [Disabled]

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]

Video Memory Cache Mode [UC]

USWC (uncacheable, speculative write combining) is a new cache technol-

ogy for the video memory of the processor. It can greatly improve the dis-

play speed by caching the display data. You must set this to UC (uncacheable)

if your display card cannot support this feature; otherwise your system may

not boot. Configuration options: [UC] [USWC]