[SI-LIST] Re: Fwd: DDR-Length matching
- From: bala <balaseven@xxxxxxxxx>
- To: karthi keyan <karthiyen@xxxxxxxxx>
- Date: Thu, 28 Apr 2011 17:30:27 +0530
Hi karthi,
For minimum maximum length,you have to calculate the min max
propagation delay using setup hold time,skew,etc..
On the length tolerance,its related of data range and clock offset.
Thanks
bala
On Thu, Apr 28, 2011 at 4:17 PM, karthi keyan <karthiyen@xxxxxxxxx> wrote:
> Hi Experts,
> I am working on boards having DDR interface. on layout we are
> following the below groupings & length matching
>
>
> Group1- Data signals,strobe,Mask with in group +/-10 mils tolerance
> Group2- Add/Ctrl/Cmd/Clk--with in group +/-10mils tolerance
>
> i am clear on groupings but on length matching i want to know how
> to calculate the exact Min & max length matching tolerance .
>
> can you please let me clear on DDR length matching?
>
>
> Thanks,
> Karthikeyan
>
>
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--
bala
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