Foxconn A9DA English Manual. - Page 41

► DCT Unganged Mode

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3 Memory Configuration CMOS Setup Utility - Copyright (C) 1985-2006, American Megatrends, Inc. Memory Configuration Memory Configuration Help Item DCT Unganged Mode [ Always ] This allows selection of unganged DRAM mode 64-bit width Auto= Ganged mode Always=Unganged mode Move Enter:Select +/-/:Value F10:Save ESC:Exit F1:General Help F9:Optimized Defaults ► DCT Unganged Mode DCT stands for DRAM Controller. Ganged refers to the use of both DRAM controllers within a memory controller acting in concert to access memory. For a description of ganged (128-bit DRAM data width) and unganged (64-bit DRAM data width) DRAM modes : Ganged channels (DDR3) : ■ DCT channels A and B can be ganged as a single logical 128-bit DIMM. ■ Offers highest DDR3 bandwidth. ■ Requires both DIMMs in a logical pair to have identical size and timing parameters, both DCTs programmed identically. Unganged channels ■ DCT channels A and B operate as two completely independent 64-bit channels (both channels operate at the same frequency). ■ Reduce DRAM page conflicts - more concurrent open dram pages . ■ Better bus efficiency. Burst lengths supported When both DCTs are enabled in unganged mode, BIOS must initialize the frequency of each DCT in order. 34

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3
34
Burst lengths supported
When both DCTs are enabled in unganged mode, BIOS must initialize the frequency of each
DCT in order.
Memory Configuration
► DCT Unganged Mode
DCT stands for DRAM Controller.
Ganged refers to the use of both DRAM controllers within a memory controller acting in con-
cert to access memory. For a description of ganged (128-bit DRAM data width) and unganged
(64-bit DRAM data width) DRAM modes :
Ganged channels (DDR3) :
■
DCT channels A and B can be ganged as a single logical 128-bit DIMM.
■
Offers highest DDR3 bandwidth.
■
Requires both DIMMs in a logical pair to have identical size and timing parameters, both
DCTs programmed identically.
Unganged channels
■
DCT channels A and B operate as two completely independent 64-bit channels (both chan
-
nels operate at the same frequency).
■
Reduce DRAM page conflicts – more concurrent open dram pages .
■ Better bus efficiency.
CMOS Setup Utility - Copyright (C) 1985-2006, American Megatrends, Inc.
Memory Configuration
Memory Configuration
Help Item
DCT Unganged Mode
This allows selection of
unganged DRAM mode
(64-bit width).
Auto= Ganged mode
Always=Unganged mode
↑↓←→:Move
Enter:Select
+/-/:Value
F10:Save
ESC:Exit
F1:General Help
F9:Optimized Defaults
[Always]