BCM QS750, User Manual

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4. BIOS Setup
4.5 Advanced Chipset Features Setup Menu
CMOS Setup Utility – Copyright © 1984-1999 Award Software.
Advanced Chipset Features
Move to items
Enter Sub-
Menu
Modify values
System BIOS Cacheable
Video RAM Cacheable
Memory Hole At 15M-16M
AGP Aperture Size (MB)
AGP ISA Aliasing
K7 CLK_CTL Select
SDRAM ECC Setting
SDRAM PH Limit
SDRAM Idle Limit
SDRAM Trc Timing Value
SDRAM Trp Timing Value
SDRAM Tras Timing Value
SDRAM CAS Latency
SDRAM Trcd Timing Value
Enabled
Enabled
Disabled
64
Enabled
Optimal
Disabled
64 Cycle
8 Cycle
7 Cycle
2 Cycle
5 Cycle
3 Cycle
2 Cycle
Item Help
Menu Level
Exit to Main
Menu
¡ ô ¡ õ ¡ ÷ ¡ ö
:Move Enter: Select +/-/PU/PD/ : Modify F10:Save Esc: Exit F1:
General Help
F5:Previous Values F6:Fail-Safe Defaults F7: Optimized Defaults
Figure 4: Advanced Chipset Features Setup Menu
4.5.1 System BIOS Cacheable
Select Enabled allows caching of the system BIOS ROM at F0000h-FFFFFh, resulting in
better system performance. However, if any program writes to this memory area, a system
error may result.
4.5.2 Video RAM Cacheable
Select Enabled allows caching of the Video RAM, resulting in better system performance.
However, if any program writes to this memory area, a system error may result.
4.5.3 Memory Hole At 15M – 16M
You can reserve this area of system memory for ISA adapter ROM. When this area is
reserved, it cannot be cached. The user information of peripherals that need to use this area
of system memory usually discusses their memory requirements.
4.5.4 AGP Aperture Size (MB)
Select 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. Hose cycles
that hit the aperture range are forwarded to the AGP without any transaction. See
www.agpforum.org for AGP information.