User Guide

3-12 Chapter3
SE6
SDRAM Cycle Time Tras/Trc:
Two options are available: 5/7 and 7/9. The default setting is
7/9
. This item controls the number of
SDRAM clocks (SCLKs) used per access cycle.
SDRAM RAS-to-CAS Delay
Two options are available: 2 and 3. The default setting is
3
. This item lets you insert a timing delay
between the CAS and RAS strobe signals, used when DRAM is written to, read from, or refreshed.
Fast
(2)
gives faster performance; and
Slow(3)
gives more stable performance. This item applies only when
synchronous DRAM is installed in the system.
SDRAM RAS Precharge Time:
Two options are available: 2 and 3. The default setting is
3
. This option lets you insert a timing delay
between the CAS and RAS strobe signals, used when DRAM is written to, read from, or refreshed.
Fast
(2)
gives faster performance; and
Slow (3)
gives more stable performance. This item applies only when
synchronous DRAM is installed in the system.
System BIOS Cacheable:
You can select Enabled or Disabled. The default setting is
Enabled
. When you select
Enabled
allows
caching of the system BIOS ROM at F0000h-FFFFFh, resulting in better system performance. However,
if any program writes to this memory area, a system error may result.
Video BIOS Cacheable:
You can select Enabled or Disabled. The default setting is
Enabled
.
Enabled
allows caching of the video
BIOS, resulting in better system performance. However, if any program writes to this memory area, a
system error may result.
Memory Hole At 15M-16M:
Two options are available: Enabled and Disabled. The default setting is
Disabled
. This option is used to
reserve the memory block 15M-16M for ISA adapter ROM. Some special peripherals need to use a
memory block located between 15M and 16M, and this memory block has a size of 1M. We recommend
that you disable this option.
Delayed Transaction:
Two options are available: Enabled and Disabled. The default setting is
Disabled
. Set the option to
enabled or disabled PCI 2.1 features including passive release and delayed transaction for the chipset.
This function is used to meet the latency of PCI cycles to or from the ISA bus. This option must be
enabled to provide PCI 2.1 compliance. If you have an ISA card compatibility problem, you can try to
enable or disable this option for optimal results.
On-Chip Video Window Size:
Three options are available: 64MB
)
32MB
)
Disabled. The default setting is
64MB
. This option
specifies the amount of system memory that can be used by the built-in AGP graphic data. Note that this
item won’t be shown when using add-on AGP card.