JETWAY 830CN User Manual page 34

Please refer to section 3-6-1
AGP Function Settings
This option determines the effective size of the graphics aperture used in the particular PAC
configuration. The AGP aperture is memory-mapped, while graphics data structure can
reside in a graphics aperture. The aperture range should be programmed as not cacheable in
the processor cache, accesses with the aperture range are forwarded to the main memory, then
PAC will translate the original issued address via a translation table that is maintained on the
main memory. The option allows the selection of an aperture size of 32MB, 64MB.
Please refer to section 3-6-2
PCI GRANT Parking On
The settings are: PMR, PCI Master.
Memory Parity Check
This function provides parity check of memory.
The choice is either Disabled or Enabled.
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 to this memory area, a system
error may result. The settings are: Enabled and Disabled.
Video RAM Cacheable
Select 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 result. The settings
are: Enabled and Disabled.
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. The settings are: Enabled and
Disabled.
3-6-1 DRAM Timing Setting
CMOS Setup Utility – Copyright(C) 1984-2000 Award Software
Auto Configuration
RAS Active Time
RAS Precharg Time
RAS to CAS Delay
Early CKE Delay Adjustment
Early CKE Delay 1T Control
Write Recovery Time
Background Command Lead-off Time
Read/Write Cycles Lead-off Time
CAS Latency
DRAM Timing Setting
Manual
6T
3T
3T
Auto
Normal
2T
Delay 1T
Delay 1T
Auto
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