Dram Timing Configuration - Foxconn A7GM-S User Manual

DRAM Timing Configuration

DRAM Timing Configuration
Memory Speed Mode
DRAM Timing Mode
↑↓←→:Move Enter:Select
► Memory Speed Mode
This item is used to enable/disable provision of DRAM timing by SPD device. The Serial
Presence Detect (SPD) device is a small EEPROM chip, mounted on a DDR2 memory
module. It contains important information about the module's speed, size, addressing mode
and various other parameters, so that the motherboard memory controller (chipset) can better
access the memory device.
Select [Auto] for SPD enable mode.
Select [Limit], the DRAM speed will not exceed the specified value listed in the "Memory
Speed Adjust" item. If SPD value is faster than "Memory Speed Adjust" value, it will run at the
specified "Memory Speed Adjust" speed. Otherwise, SPD value is selected.
Select [Manual], then DRAM speed is manually selected according to the set value of
"Memory Speed Adjust".
► Memory Speed Adjust
This item will appear only when the "Memory Speed Mode" is set to [Limit] or [Manual].
The available settings are : [400MHz], [533MHz], [667MHz], [800MHz], [1066MHz].
► DRAM Timing Mode
When both DCTs (DRAM controller) are enabled in unganged mode, BIOS must initialize the
frequency of each DCT in order, you also can configure the timings manually.
Settings are : [Auto], [DCT 0], [DCT1], [Both].
[DCT 1] and [Both] will appear only in AM2+ CPU.
► tCL (CAS Latency)
The number of memory clocks it takes a DRAM to return data after the read CAS_L is asserted
depends on the memory clock frequency. The value that BIOS programs into the memory
controller is a function of the target clock frequency. The target clock frequency is determined
from the supported CAS latencies at given clock frequencies of each DIMM.
► tRCD (RAS-to-CAS Delay)
This item allows you to select a delay time (in clock cycles) between the CAS# and RAS#
strobe signals.
CMOS Setup Utility - Copyright (C) 1985-2006, American Megatrends, Inc.
DRAM Timing Configuration
+/-/:Value
F9:Optimized Defaults
[Auto] [Auto]
[Auto]
Auto
Limit
Manual
F10:Save ESC:Exit
34
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