[SI-LIST] Re: DDR3 Multi rank -ODT
- From: Hermann Ruckerbauer <hermann.ruckerbauer@xxxxxxxxxxxxx>
- To: kbmanick@xxxxxxxxx
- Date: Tue, 10 Jul 2012 09:30:15 +0200
Hello,
in case of a Dual rank there are options to get the termination done
just on one Rank of a dual Rank DIMM.
Especially in case of Duel die (or even Quad die) components it is a
don't care on which of the Dice you are terminating. in a Quad Rank
stack there are not even enough pins on the package to get an ODT
signal to all internal devices .
If the controller has a good implementation it is possible to support 4
DIMMs (dual Rank each) with 4 ODT signals ...
In case of Quad Rank DRAM Support This would mean two Slots with 2 ODT
Signals per slot...
Hermann
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schrieb Balamanikandan K:
> hi
> A DDR3 memory controller has the following pins : ODT0,ODT1,ODT2 and ODT3
>
> But it has the option to support 8 ranks.
>
> In general, One ODT signal is required per rank. Am I right?
>
> How is it possible to use 4 ODT signals for 8 Ranks application?
>
> Please explain me.
>
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