Apollo ECM-3612, User Manual

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User’s Manual
ECM-3612 User’s Manual 67
3.5.3.3 Bank Interleave
Enables to set the interleave mode of the SDRM interface which allows banks of SDRAM to
alternate their refresh and access cycles.
The choices: Disabled, 2 Bank, 4 Bank.
3.5.3.4 Memory Hole
When this item is enabled, ISA ROM will be mapped to 15-16M area and also support
legacy ISA devices. While this item is disabled and legacy ISA devices are not utilized,
the graphic performance will be enhanced.
The choices: Disabled, 512K-640K, 15M-16M, 14M-16M.
3.5.3.5 P2C/C2P Concurrency
CPU bus will be occupied during the entire PCI operation period when disabled.
The choices: Enabled, Disabled.
3.5.3.6 System BIOS Cacheable
This feature is only valid when the system BIOS is shadowed. It enables or disables the
caching of the system BIOS ROM at
F0000h-FFFFFh
via the L2 cache. This greatly
speeds up accesses to the system BIOS. However, this does
not
translate into better
system performance because the OS does not need to access the system BIOS much.
The choice: Enabled, Disabled.
3.5.3.7 Video RAM Cacheable
This feature is only valid when the video BIOS is shadowed. It enables or disables the
caching of the video BIOS ROM at
C0000h-C7FFFh
via the L2 cache. This greatly speeds
up accesses to the video BIOS. However, this does
not
translate into better system
performance because the OS bypasses the BIOS using the graphics driver to access the
video card's hardware directly.
The choice: Enabled, Disabled.
3.5.3.8 Frame Buffer Size
Select the size of onboard video controller’s frame buffer. The buffer size are share from
system memory unit.
The choices: 2MB, 4MB, 8MB, 16MB, 32MB.
3.5.3.9 AGP Aperture Size
Select the size of 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 choices: 4MB,8MB,16MB.32MB, 64MB,128MB.
3.5.3.10 AGP-4X Mode
This item allows you to enable / disable the AGP-4X Mode.
The choices: Enabled, Disabled.