[SI-LIST] DDR2 eye-diagram masks creation
- From: Aaditya Kandibanda <aaditya.kandibanda@xxxxxxxxx>
- To: "ddankomm@xxxxxxxxx" <ddankomm@xxxxxxxxx>
- Date: Tue, 9 Oct 2012 08:20:56 -0700
Hello Danko,
I crated eye mask for DDR2 800 memory from the data sheet I had for the
memory, I used information like minimum logic high width, minimum logic low
width, Vih min and Vil max. I assumed sampling point to be at 0.5UI. I also
used setup and hold time requirements.
Well, I never used that mask for any real time application, it was for my
practice in designing interconnects.
On Tuesday, October 9, 2012, danko miocinovic wrote:
> Dear Experts,
> I am doing some verification of LPDDR2 memories and my question is about
> creating eye-diagrams. I got some material from Agilent but it gives not
> enough details.
> How do you create eye-diagram mask, what are the boundaries? If we imagine
> the central romboid of a mask, I am interested if there is some detailed
> tutorial about setting those boundaries.
> If I have e.g. 533 memory and I know exactly what the frequency is, I can
> calculate the UI x-size and easily create it.
> What are boundaries for Y coordinates in this central part (grayed-out
> area), how to create them? Do I put some minimal or maximal values there
> (maximum values sound as the worst case)?
>
> I hope I was clear enough about what I would like to know, if not I could
> provide more info.
>
> Thank you.
>
>
>
> Kind regards,
>
> Danko Miocinovic
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