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Chapter 4 Award BIOS Setup
Page: 4-12
Prox-1640 USER
′
S MANUAL
This parameter allows you to configure the system based on the specific
features of the installed chipset. The chipset manages bus speed and
access to system memory resources, such as DRAM and the external cache.
It also coordinates communications between conventional ISA bus and the
PCI bus. It must be stated that these items should never need to be altered.
The default settings have been chosen because they provide the best opera-
ting conditions for the system. The only time you might consider making
any changes would be if you discovered that data was being lost while
using your system.
SDRAM CAS LATENCY TIME:
You can select CAS latency time in HCLKs of 2/2 or 3/3. The system board
designer should set the values in this field, depending on the DRAM
installed. Do not change the values in this filed unless you change
specifications of the installed DRAM or the installed CPU.
SDRAM CYCLE TIME TRAS/TRC:
This item set the number of SCLKs for an access cycle.
SDRAM RAS-TO-CAS DELAY:
You can select RAS to CAS Delay time in HCLKs of 2/2 or 3/3. The
system board designer should set the values in this field, depending on the
DRAM installed. Do not change the values in this field unless you change
specifications of the installed DRAM or the installed CPU.
SDRAM RAS PRECHARGE TIME:
Defines the length of time for Row Address Strobe is allowed to precharge.
SYSTEM BIOS CACHEABLE:
This item allows you to enable 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.
VIDEO BIOS CACHEABLE:
Select Enabled allows caching of the video BIOS ROM at C0000h-F7FFFh,
resulting in better video performance. However, if any program writes to this
memory area, a system error may result.