[SI-LIST] Re: min/max trace length
- From: "shivanand Bagalkot" <shivanandbagalkot@xxxxxxxxx>
- To: "steve weir" <weirsi@xxxxxxxxxx>
- Date: Wed, 13 Aug 2008 15:06:24 +0530
Steve
This term is new to me
what is this *crosstalk induced push-out* and *crosstalk induced pull-in*.
Regards
shivanand
On 8/13/08, steve weir <weirsi@xxxxxxxxxx> wrote:
>
> Always solve for timing requirements. Flight time depends on physical
> distance and effective eR. Stripline traces see the material eR,
> microstrip see a mix of the material and air. Once you know the fixed
> timng of your chips then you can start to build a budget for flight
> time, and SI effects like loading, ringback, crosstalk induced push-out,
> pull-in etc. At 100MHz SDR you can likely safely tolerate at least 3ns
> flight time which would be at least 17.7".
>
> From a practical standpoint flash memory timing is so slow that you
> would have to have enormous trace runs before flight time becomes a
> significant issue.
>
> Steve
> bernd schuster wrote:
> > Hi,
> > I often read minimum and maximum trace lengths in datasheets of sdram
> chips
> > (for example). As I figured out the length depends on the setup margin
> and
> > hold margin.
> >
> > If I have a setup margin of 2ns and hold margin of 0.8ns (e.g.) - which
> > formulas will tell me the min. and max. trace length? The system is
> working
> > at 100MHz with a fall time / rise tim of 2ns.
> >
> > How do I have to modify the formula when I want to calculate the timing
> for
> > an external flash memory (without clock traces)?
> >
> > best regards
> > Bernd
> >
> >
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Regards
Shivanand
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