Foxconn Inferno Katana User Manual page 54

Memory Timing Config
CMOS Setup Utility - Copyright (C) 1985-2009, American Megatrends, Inc.
PCI MMIO ALLocation: 4GB To 3328MB
Memory Remap Feature
Fast MRC
Configure DRAM Timing by SPD
DRAM Command Rate
DRAM Margin Ranks
↑↓←→:Move Enter:Select
► Memory Remap Feature
This item is used to enable/disable memory remapping around memory hole.
PCI doesn't actually care much which addresses are used, but by convention the PC platform
puts them at the top of the 32-bit address space. For many years it wasn't possible or practical
to put that much RAM into a PC. But now it is, so it's up to the memory controller and host
bridge to figure out what to do. Many systems cause that high RAM to simply be ignored,
resulting in the loss of effective RAM. More complex systems will take the RAM that would
occupy that 3.5-4GB address space and re-map it into the 4.0-4.5 address space. The RAM
doesn't care because it's just an array of storage cells, it's up to the memory controller to as-
sociate addresses with those storage cells.
Of course, that only works if you're using a 64-bit (or 32bit physical address extension (PAE)
enabled) OS that can deal with physical addresses larger than 32 bits.
Once this option is enabled, BIOS will display the true size of memory installed.
► Fast MRC
[Enabled]: While cold booting, MRC directly restores memory data from valid NVRAM without
hardware training.
[Disabled]: The cold booting with memory detection and hardware training.
► Configure DRAM Timing by SPD
This item is used to select the provision of DRAM timing by SPD device. The Serial Presence
Detect (SPD) device is a small EEPROM chip, mounted on a memory module. It contains
important information about the module's speed, size, addressing mode and various other pa-
rameters, so that the motherboard memory controller (chipset) can better access the memory.
► DRAM Command Rate
This item allows you to select a delay time (in clock cycles) between sending the last
data from a write operation to the memory and issuing a read command.
► DRAM Margin Ranks
This item is used to get all DRAM ranks best margin.
Memory Timing Config
Enabled
Disabled
Auto
Auto
Disabled
+/-/:Value F10:Save ESC:Exit
F9:Optimized Defaults
47
Help Item
Enabled: ALLow
remapping of
over lapped PCI memory
above the total
physical memory.
Disabled: Do not allow
remapping of memory.
F1:General Help