Advantech PCA-6008G2, Руководство пользователя

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PCA-6008G2 User Manual 32
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: [2T] to [5T], [Auto].
3.5.5 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.”
3.5.6 System Memory Frequency
To adjust the frequency of memory. The choices are: "400MHz," "533MHz" and
"Auto."
3.5.7 System BIOS Cacheable
Selecting “Enabled” allows caching of the system BIOS ROM at F0000h-FFFFFh,
resulting in better system performance. However, if any program writes data to this
memory area, a system error may occur. The Choices: "Enabled," "Disabled."
3.5.8 Video BIOS Cacheable
Selecting “Enabled” allows caching of the video BIOS, resulting in better system per-
formance. However, if any program writes to this memory area, a system error may
occur. The Choices: "Enabled," "Disabled."
3.5.9 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.”
3.5.10 PCI-Express Root Port Func
PCI Express Port 1/2/3/4
The default setting is “Auto.” The choices are “Enabled,” “Disabled,” and “Auto.”
PCI-E Compliancy Mode
It allows user to select the PCI-E compliant mode. Setting options: [v1.0], [v1.0a].
3.5.11 On-Chip Frame Buffer Size
The On-Chip Frame Buffer Size can be set us 1 MB or 8 MB. This memory is shared
with the system memory.
3.5.12 DVMT Mode
This option shows the active system memory mode.
3.5.13 DVMT/ FIXED Memory Size
Specify the size of DVMT and system memory to allocate for video memory.