[SI-LIST] Re: min/max trace length
- From: steve weir <weirsi@xxxxxxxxxx>
- To: shivanand Bagalkot <shivanandbagalkot@xxxxxxxxx>
- Date: Wed, 13 Aug 2008 02:41:52 -0700
Switching signals on aggressor lines alter the timing of switching
signals on victim lines.
Steve
shivanand Bagalkot wrote:
>
> 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
> <mailto: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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>
> --
> Steve Weir
> Teraspeed Consulting Group LLC
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> --
> Regards
> Shivanand
--
Steve Weir
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
California office
(866) 675-4630 Business
(707) 780-1951 Fax
Main office
(401) 284-1827 Business
(401) 284-1840 Fax
Oregon office
(503) 430-1065 Business
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http://www.teraspeed.com
This e-mail contains proprietary and confidential intellectual property of
Teraspeed Consulting Group LLC
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