Intel i945G2-IQNAR User Manual page 54

I945G2-IQNAR
2.5.4 DRAM RAS# Precharge
When the DRAM Timing Selectable is set to [Manual], this field is adjustable. This setting
controls the number of cycles for Row Address Strobe (RAS) to be allowed to precharge. If
no sufficient time is allowed for the RAS to accumulate its charge before DRAM refresh,
refreshing may be incomplete and DRAM may fail to retain data. This item applies only
when synchronous DRAM is installed in the system. Setting options are [2T] to [5T], and
[Auto].
2.5.5 Precharge Delay (t RAS)
This item allows you to select the value in this field, depending on whether the board has
paged DRAMs or EDO (extended data output) DRAMs. The choices are: "4" to "15" and
"Auto".
2.5.6 System Memory Frequency
To adjust the frequency of memory. The choices are: "333MHz", "400MHz", "533MHz" and
"Auto".
2.5.7 System BIOS Cacheable
Selecting "Enabled" allows caching of the system BIOS ROM at F0000h- FFFFFh, resulting
in better system performance. However, if any pro- gram writes data to this memory area, a
system error may occur. The Choices are "Enabled", and "Disabled".
2.5.8 Video BIOS Cacheable
Selecting "Enabled" allows caching of the video BIOS, resulting in better system
performance. However, if any program writes to this memory area, a system error may
occur. The choices are "Enabled", and "Disabled".
2.5.9 Memory Hole At 15M-16M
Enabling this feature reserves 15 MB to 16 MB memory address space for ISA expansion
cards that specifically require this setting. This makes memory from 15 MB and up
unavailable to the system. Expansion cards can only access memory up to 16 MB. The
default setting is "Disabled".
2.5.10 PEG/Onchip VGA Control
The selections are "Auto", "Onchip VGA" or "PEG Port".
2.5.11 On-Chip Frame Buffer Size
The On-Chip Frame Buffer Size can be set to 1 MB or 8 MB. This memory is shared with
the system memory.
2.5.12 DVMT Mode
Use this field to select the memory to allocate for video memory. The choices are "Fixed",
"DVMT" and "BOTH".
2.5.13 DVMT/Fixed Memory Size
Specify the size of DVMT/system memory to allocate for video memory.
54 i945G2-IQNAR User's Manual