Acnodes FPC 8084, User Manual, Page: 49 / 66

FPC 8084 User s Manual
DRAM Timing By SPD
This item is selected depending on whether the board has paged
DRAMs or EDO (extended data output) DRAMs.
DRAM Clock
The DRAM clock value is set depending on whether the board has paged
DRAMs or EDO (extended data output) DRAMs. The available choices
are 66 MHz and Host CLK.
SDRAM 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 .
Memory Hole
To improve performance, certain space in memory is reserved for ISA
cards. This memory must be mapped into the memory space below
16MB. The available choices are 15M-16M and Disabled.
P2C/C2P Concurrency
This item enables or disables the PCI to CPU and CPU to PCI
concurrency. By default, this field is set to
Enabled .
System BIOS Cacheable
Selecting “ 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.
The choice: Enabled, Disabled.
Video RAM Cacheable
Selecting
“
Enabled
”
allows caching of the A/B segment, resulting in
better system performance.
The choice: Enabled, Disabled.
AGP Aperture Size
The field sets aperture size of the graphics. 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.
The choice: 4M, 8M, 16M, 32M, 64M, 128M and 256M.
OnChip USB
This should be enabled if the system has a USB installed on the system
board and the USB will be used. Even when equipped, if a higher
performance controller is added, this feature should be disabled.
The choice: Enabled, Disabled.
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