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Manual Number: 00431-220-5
Page A-10
SB586T Series Manual
External Cache
This option selects the type of caching algorithm used by AMIBIOS and the CPU for L2 secondary
(external) cache memory. The settings are:
Setting
Description
WRITEBACK
A write-back algorithm is used.
WRITE-THROUGH A write-through algorithm is used.
DISABLED
AMIBIOS does not specify the type of caching algorithm.
The optimal default setting is
WRITEBACK.
The fail-safe default setting is
DISABLED
.
System BIOS Cacheable
AMIBIOS always copies the system BIOS from ROM to RAM for faster execution. Set this option
to ENABLED to permit the contents of the F0000h RAM memory segment to be written to and
read from cache memory. The settings are ENABLED or DISABLED
.
The optimal default setting
is
ENABLED.
The fail-safe default setting is
DISABLED.
C000, 16K Shadow
C400, 16K Shadow
These options specify how the contents of the video ROM are handled. The settings are:
Setting
Description
DISABLED The Video ROM is not copied to RAM.
CACHED
The contents of the video ROM area from C0000h - C7FFFh are not only copied
from ROM to RAM, the contents of the C0000h - C7FFFh RAM area can be
written to or read from cache memory.
SHADOW The contents of the video ROM area from C0000h - C7FFFh are copied
(shadowed) from ROM to RAM for faster execution.
The optimal default setting is
CACHED
. The fail-safe default setting is
DISABLED.
C800,16K Shadow
CC00,16K Shadow
D000,16K Shadow
D400,16K Shadow
D800,16K Shadow
DC00,16K Shadow