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Chapter 4: Phoenix BIOS
4-9
to enable this function, and the area designated will be reserved for the
BIOS ROM access only. Select "Uncached" to disable this function and
make this area available for other devices.
Cache Video BIOS Area
This setting allows you to designate a reserve area in the system
memory to be used as a Video BIOS buffer to allow the BIOS to write
(cache) its data into this reserved memory area. Select "Write Protect"
to enable the function, and this area will be reserved for the BIOS ROM
access only. Select "Uncached" to disable this function and make this
area available for other devices.
Cache Base 0-512K
If enabled, this feature will allow the data stored in the base memory
area: block 0-512K to be cached (written) into an area in the Static
DRAM or written into L1, L2, L3 cache inside the CPU to speed up CPU
operation. Select "Uncached" to disable this function. Select "Write
Through" to allow data to be cached into the buffer and be written into
the system memory at the same time. Select "Write Protect" to prevent
data from being written into the base memory area of Block 0-512K.
Select "Write Back" to allow the CPU to write data back directly from the
buffer without writing data to the System Memory for fast CPU data
processing and operation. The options are "Uncached", "Write Through",
"Write Protect", and "Write Back".
Cache Base 512K-640K
If enabled, this feature will allow the data stored in the memory area:
512K-640K to be cached (written) into an area in the Static DRAM or be
written into L1, L2, L3 cache inside the CPU to speed up CPU operation.
Select "Uncached" to disable this function. Select "Write Through" to
allow data to be cached into the buffer and written into the system
memory at the same time. Select "Write Protect" to prevent data from
being written into the base memory area of Block 512-640K. Select "Write
Back" to allow CPU to write data back directly from the buffer without
writing data to the System Memory for fast CPU data processing and
operation. The options are "Uncached", "Write Through", "Write Protect",
and "Write Back".