VIA Mainboard 845D-MVT, Руководство пользователя

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The 845D-MVT MAINBOARD Page 28
Managing The PC BIOS
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DRAM RAS# Precharge Time
If the DRAM is not continually refreshed it’s data will be lost. DRAM is normally
refreshed as a result of a single request. This field lets you select the number
of CLKs allocate for the RAS to accumulate its charge before the DRAM is re-
freshed. If there is not sufficient time then the refresh may be incomplete and
some of the data can be lost.
DRAM Data Integrity Mode
Error Checking and Correction (ECC) should only be used in conjunction with a
special 72-bit ECC RAM. If you are using ECC RAM you should select ECC.
This feature will enable the system to detect and correct single-bit errors and
detect (not correct) double-bit errors. If you do not have ECC RAM then select
Non-ECC (the default mode).
Memory Frequency For
This field allows you to manually select the frequency of the memory modules
you are using. This mainboard supports both PC100 and PC133 SDR modules.
If you do not know what the frequency of your memory modules is then select
auto and the system will automatically decide.
System BIOS\ Video BIOS \Video RAM Cacheable
These fields enable (disable) the caching of the System BIOS , the Video
BIOS and the Video RAM. The Sysem BIOS is cached at F0000h-FFFFFh,
the Video BIOS is cached at C0000h-C7FFFh, and the Video RAM is cached
at A0000h-AFFFFh. All three are cached via the L2 cache. If these options are
enabled, access to the system BIOS may speed up BUT if any other program
tries to write to the memory locations specified above then the system will
crash. We recommend that you disable these options. Note The System/Video
BIOS can only be cached when the System BIOS/Video BIOS has been shad-
owed.
AGP Aperture Size
This field selects the size of the Accelerated Graphics Port (AGP) aperture. 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 default is 64MB. You may increase this
memory when you need to have faster access for 3D graphics applications.