Advantech PCA-6188, Руководство пользователя

Страница: 50 / 124

PCA-6188 User’s Manual 34
3.5.3 Active to Precharge Delay
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: "8", "7", "6" and "5".
3.5.4 DRAM RAS# to CAS# Delay
In order to improve performance, certain space in memory is reserved for
ISA cards. This memory must be mapped into the memory space below
16MB. The Choice: "4", "3" and ''2".
3.5.5 DRAM RAS# Precharge
This controls the idle clocks after issuing a precharge command to
DRAM. Leave this on the default setting. The choice : "4", "3" and "2".
3.5.6 Memory Frequency
To adjust the frequency of memory. The choice : "DDR266", "DDR333",
"DDR400" 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 pro-
gram writes 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 performance. 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 Delay Prior to Thermal
Select the period if user wants to lower the CPU speed when CPU tem-
perature is too high. The choice: "4 Min", "8 Min", "16 Min" and "32
Min".
3.5.11 AGP Aperture Size (MB)
Select the size of Accelerated Graphics Port (AGP) aperture. The aper-
ture is a portion of the PCI memory address range dedicated for graphics
memory address space. Host cycles that hit the aperture range are for-
warded to the AGP without any translation. The Choice : "4", "8", "16",
"32", "64", "128", and "256".