Specifications

AR-B1564 User¡¦s Guide
7-5
Internal Cache
This option specifies the caching algorithm used for L1 internal cache memory. The settings are:
Setting Description
Disabled
Neither L1 internal cache memory on the CPU or L2
secondary cache memory is enabled.
WriteBack
Use the write-back caching algorithm.
WriteThru
Use the write-through caching algorithm.
Table 7-1 Internal Cache Setting
External Cache
This option specifies the caching algorithm used for L2 secondary (external) cache memory. The settings are:
Setting Description
Disabled Neither L1 internal cache memory on the CPU or L2
secondary cache memory is enabled.
WriteBack Use the write-back caching algorithm.
WriteThru Use the write-through caching algorithm.
Table 7-2 External Cache Setting
System BIOS Cacheable
When this option is set to Enabled, the contents of the F0000h system memory segment can be read from or
written to L2 secondary cache memory. The contents of the F0000h memory segment are always copied from the
BIOS ROM to system RAM for faster execution.
The settings are Enabled or Disabled. The <Optimal default settings> is Enabled. The <Fail-Safe default setting>
is Disabled.
Shadow
These options control the location of the contents of the 32KB of ROM beginning at the specified memory location.
If no adapter ROM is using the named ROM area, this area is made available to the local bus. The settings are:
SETTING DESCRIPTION
Disabled
The video ROM is not copied to RAM. The contents of
the video ROM cannot be read from or written to cache
memory.
Enabled
The contents of C000h - C7FFFh are written to the same
address in system memory (RAM) for faster execution.
Cached
The contents of the named ROM area are written to the
same address in system memory (RAM) for faster
execution, if an adapter ROM will be using the named
ROM area. Also, the contents of the RAM area can be
read from and written to cache memory.
Table 7-3 Shadow Setting