FreeLists / si-list / [SI-LIST] Re: DDR SSTL-2 Signal Terminations

[Eric Deys <edeys@xxxxxxxxxx>]

Anand,

Sorry, I now realize that when you used the term single data rate you were 
talking
about the unidirectional signals that run at the 1x clock (address and control).
The term SDR has a very specific and related meaning in SDRAM as you know.  
Sorry
for the confusion!  From what I've read, both the bidirectional and 
unidirectional
signals are terminated the same way!

Eric Deys

Anand.Kuriakose@xxxxxxxxxx wrote:

> Hi All,
>
> The SSTL-2 spec mentions different termination techniques like
> 1>   Double parallel termination.
> 2>   Single parallel termination with series termination etc
>
> When it comes to DDR designs utlizing SSTL-2 signalling, there are some
> bi-directional signals (eg Data and strobe signals) and uni-directional 
> signals
> (like Address and control signals).
>
> My doubt is how to determine the best method of termination among the ones
> mentioned in the SSTL-2 spec?
> Does the type of termination selected differ for bi-directional and
> uni-directional signals and also with respect to Dual data rate (Data) and
> Single Data rate (Address and control signals)?
>
> Thanks in advance.
>
> Regards,
> Anand.
>
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--
Eric Deys
Senior IC Design Engineer
Video Products Division
Gennum Corporation
3430 South Service Road
Burlington, L7N 3T9
edeys@xxxxxxxxxx
(905) 632-2999 x 3200


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