[SI-LIST] Re: min/max trace length

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
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