[SI-LIST] Re: Fwd: DDR-Length matching
- From: steve weir <weirsi@xxxxxxxxxx>
- To: karthi keyan <karthiyen@xxxxxxxxx>
- Date: Thu, 28 Apr 2011 05:17:43 -0700
The timing relationship versus distance is determined by the propagation
velocity over the path. The propagation velocity depends on the
effective dielectric constant over the path. +/-10 mils means different
things for microstrip versus stripline and different things for
different dielectric types.
Steve.
On 4/28/2011 3:47 AM, karthi keyan 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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Steve Weir
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