[SI-LIST] Re: DDR3 - AC parameter
- From: bala <balaseven@xxxxxxxxx>
- To: "Katkoria, Deepak" <Katkoria.Deepak@xxxxxxxxxxx>
- Date: Wed, 4 Aug 2010 14:44:40 +0100
Hi Deepak,
good day,
2.ADD/CMD need extra care. Hope u meant fly by termination.
3.Use separate plane for processor and memory.Dont use same plane for both
device and follow some EMC guidelines.
On Wed, Aug 4, 2010 at 2:26 PM, Katkoria, Deepak <
Katkoria.Deepak@xxxxxxxxxxx> wrote:
> Halo,
> Presently, I am working on DDR3 interface.
> I would like to know following things,(which are not explain in Std.)
> 1. how to check the AC input logic high Vih(ac) in Oscilloscope??
>
> 2. For the Fly by architecture, which signal is less immune and need
> extra care for routing on inner layer DQ or ADD/CMD
>
> 3. I am getting lots of EMC emission on VTT plan for on board DDR3. What
> could be the reason?
>
> 4. Do you know the difference between AC175 and AC150??
>
> 5. Why there is AC reading in high speed signals, upto know I have only
> dealt with Vih(dc) and never used Vih(ac).
>
> 6. why are they using AC rating with DC ratings??
>
>
> Cheers,
> Deepak
>
>
>
>
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--
bala
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