[SI-LIST] Re: DDR3 dynamic ODT
- From: Hermann Ruckerbauer <Hermann.Ruckerbauer@xxxxxxxxxxxxx>
- To: lijun_hit@xxxxxxxxx
- Date: Sat, 31 Aug 2013 09:20:10 +0200
Hello,
The simple explanation is: With ODT (RTT_Nom) you terminate long open
stubs that leads to non Written Ranks (or Ranks you are not Reading from).
RTT_wr is enabled by a Write command and can terminat the DRAM that is
written. This should minimize the Reflections coming back from this DRAM.
Target is to find the optimum combination that does not kill your
voltage margin while having adequate timing margins.
If you are now talking about different populations (Slot empty, single
Rank, double rank or quad Rank) and high number of Slots it's getting
interesting to find this optimum combination for all cases.
Best regards
Hermann
EKH - EyeKnowHow
Hermann Ruckerbauer
www.EyeKnowHow.de
Hermann.Ruckerbauer@xxxxxxxxxxxxx
Itzlinger Strasse 21a
94469 Deggendorf
Tel.: +49 (0)991 / 29 69 29 05
Mobile: +49 (0)176 / 787 787 77
Fax: +49 (0)3212 / 121 9008
schrieb jun li:
> Hi,
> Please help recommend some documents on how the multirank DIMM's are accessed
> by the controller along with ODT options. How RTT_Nom and RTT_wr enabled or
> disabled.
> Thanks
> Jun
>
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