[SI-LIST] Re: DDR2 - 7 LOADS -suitable topology
- From: bala <balaseven@xxxxxxxxx>
- To: "Zabinski, Patrick" <zabinski.patrick@xxxxxxxx>
- Date: Tue, 20 Dec 2011 19:40:28 +0530
Mani,
Do you really need 7 DDR2..can u explain a bit about your
project/application...I dont think 7 DDR2 is needed.
Thanks
bala
SI Engineer,
http://www.facebook.com/Bala.The.Signal.Doctor
On Tue, Dec 20, 2011 at 7:08 PM, Zabinski, Patrick <
zabinski.patrick@xxxxxxxx> wrote:
> B.K.,
> A 7-drop daisy chain is challenging to properly terminate. As mentioned
> in a previous post, it's useful to learn from what folks have previously
> done in DIMM packaging. However, there are situations that fall outside
> of DIMM packaging that require custom solutions.
>
> One approach we found to be effective is to insert series resistors
> before each load - at the junction between the primary daisy-chain path
> and the load path. The additional resistors (typically between 10 ohms
> and 20 ohms in value) help significantly, but they do increase the part
> count (i.e., cost).
>
> The values of the termination resistors and transmission lines need to
> be optimized for the particular application. However, using
> optimization routines (often built in to your simulator, such as HSPICE
> and ADS) allow you to quickly determine useful values.
>
> It's a bit old, but we presented such a concept back at DesignCon 2007
> (TP1-10).
>
> Good luck,
> Pat Zabinski
>
>
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> > Behalf Of Balamanikandan K
> > Sent: Tuesday, December 20, 2011 5:19 AM
> > To: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] DDR2 - 7 LOADS -suitable topology
> >
> > hi
> > A processor has to be connected to 7 DDR2 chips.What are the various
> > methods to connect them to achieve better signal integrity? What is
> the
> > alternative solution to achieve the symmetric topology?
> >
> >
> >
> >
> >
> > --
> > Best Regards,
> > Balamanikandan.K
> >
> >
> > ------------------------------------------------------------------
> > To unsubscribe from si-list:
> > si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
> >
> > or to administer your membership from a web page, go to:
> > //www.freelists.org/webpage/si-list
> >
> > For help:
> > si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
> >
> >
> > List technical documents are available at:
> > http://www.si-list.net
> >
> > List archives are viewable at:
> > //www.freelists.org/archives/si-list
> >
> > Old (prior to June 6, 2001) list archives are viewable at:
> > http://www.qsl.net/wb6tpu
> >
>
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> //www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
> http://www.si-list.net
>
> List archives are viewable at:
> //www.freelists.org/archives/si-list
>
> Old (prior to June 6, 2001) list archives are viewable at:
> http://www.qsl.net/wb6tpu
>
>
>
--
bala
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
