[SI-LIST] Re: In Most of the DDR 3 design there are used Daisy chain routing for Address bus. Why?
- From: Hermann Ruckerbauer <hermann.ruckerbauer@xxxxxxxxxxxxx>
- To: "Prakash Mohanraj, TLS-Chennai" <mprakash@xxxxxx>
- Date: Thu, 17 Sep 2009 09:17:19 +0200
Helle Prakash,
going from DDR2 to DDR3 (commodity on DIMM) the signal integrity of the
DDR2 hybrid T bus was not good enough to scale to the required speeds.
Therefore one of the improvements to got to 1600Mb/s (on DQ) was to
change the Topology on CA and add the Termination on the DIMM.
There are some disadvantages (e. g. for controller design and
complexity) coming with the flyby bus. There is still the chance to use
a DDR2 like tology if:
- you have low speed and/or only a limited number of devices.
- Your Controller / BIOS supports the different timing to the "standard"
Topology (what might be most likely the case, but not necessary given)
Regards
Hermann
EKH - EyeKnowHow
Hermann Ruckerbauer
www.eyeknowhow.de
hermann.ruckerbauer@xxxxxxxxxxxxx
Veilchenstrasse 1
94554 Moos
Tel.: +49 (0)9938 / 902 083
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Prakash Mohanraj, TLS-Chennai schrieb:
> Hi ,
> In Most of the DDR 3 design there are used Daisy chain routing for
> Address bus. Why?
> Is there any advantage between Star topology and Daisy chain
> topology?
>
> Thanks & Regards,
> Prakash
>
>
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