SBC81613 Socket 370 All-in-One CPU Card Series User
’
s Manual
BIOS Configuration
49
z
DRAM Cycle Length
When synchronous DRAM is installed, the number of clock
cycles of CAS latency depends on the DRAM timing. Do not
reset this field from the default value specified by the
system designer. The default setting is
3
.
z
Memory Hole
In order to improve performance, certain space in memory
can be reserved for ISA cards. This field allows you to
reserve 15MB to 16MB memory address space to ISA
expansion cards. This makes memory from 15MB and up
unavailable to the system. Expansion cards can only access
memory up to 16MB. By default, this field is set to
Disabled
.
z
System BIOS Cacheable
When enabled, access to the system BIOS ROM addressed
at F0000H-FFFFFH is cached, provided that the cache
controller
has
Disable
.
z
Video RAM Cacheable
When enabled, access to video BIOS addressed at C0000H
to C7FFFH is cached, provided that the cache controller has
Disable
.
z
AGP Aperture Size
Select the size of the Accelerated Graphics Port (AGP)
aperture. The aperture is a portion of the PCI memory
address range dedicated for graphics memory address
space. Host cycles that hit the aperture range are forwarded
to the AGP without any translation.
z
OnChip USB
This should be enabled if your system has a USB installed
on the system board and you want to use it. Even when so
equipped, if you add a higher performance controller, you
will need to disable this feature. By default, this field is set
to
Enabled
.
z
USB Keyboard Support
Select “
Enabled”
if your system contains a Universal Serial
Bus (USB) controller and you have a USB keyboard.
