so does the Electra router do fan outs that are nice so that you
don't have to do them manually?

Dennis Saputelli


Mike Reagan wrote:
> 
> Emanuel,
> I forgot to mention you can also use the layer assignment in classes.  This
> also works well.  I have found this be hard to set in Spectra.
> 
> Mike Reagan
> 
> -----Original Message-----
> From: Emanuel Zimmermann [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, January 21, 2004 11:03 AM
> To: Protel EDA Forum
> Subject: Re: [PEDA] Antwort: Antwort: Autorouter
> 
> Mike
> 
> Thanks for this detailed answer. It seems that I have to try the "classes
> trick" to get design rules easier to specctra. I was not aware of this -
> currently we work with manually edited .rul files.
> 
> Emanuel
> 
> ---
> MPL AG                                   www.mpl.ch
> Emanuel Zimmermann       [EMAIL PROTECTED]
> Manager R&D                       Phone: +41 56 483'34'34
> Taefernstrasse 20               Fax:      +41 56 493'30'20
> 
> CH-5405 Daettwil
> ---
> 
> "edsi" <[EMAIL PROTECTED]> schrieb am 21.01.2004 14:16:46:
> 
> > Emanuel
> > We also suspect Protel is at fault for the 28 mil holes.  I think it
> > is a default in Protel setup.
> > As far as High Speed design rules,  You will need to stick with
> > spectra for now, since Electra does not support differential pairs
> > of matched lengths.  I did not try blind and buried vias, but I did
> > use prerouted "via in pad".  Electra was cleaner since it let these
> > connections alone and I did not have to create any "forget" commands.
> > We also tested the "BUS" command on both routers. The test board was
> > a simple backplane with identical connectors on same Grid. Spectra
> > was slightly better however,  neither Electra or Spectra routing
> > would be acceptable with this command.
> > One thing we did notice....since both routers use a "manhattan"
> > topology to place traces,  On large busses, Electra has  very few
> > loops.  It sticks to the floorplan very well.  I have a tendency to
> > use the "limit way" command on most of my designs.  This forces the
> > router to lay traces parrallel to each other on the same layer. This
> > increases the density of the routing.  Limit way is a little tighter
> > on Spectra.  I ran tests on both routers, using limit way then ran
> > test without limit way.  In both cases, Electra managed 500-700 less
> > vias out of 7800.
> >
> > What I was most impressed with was that it left the locked preroutes
> > tollally alone. Honestly, this is the first router that this worked
> > with.   If  you think Spectra is leaving them alone, look closly at
> > your design.  On some occasions it place traces either over or
> > around your preroutes.  The only way to avoid this is to create
> > "forget" classes.
> >
> > Here is the way the classes and DSN file works in Protel.   Protel
> > does not export classes. I wish it would.  If you want to create
> > widths lets say for DATA D0-D7, created a classs called DAT0_7, then
> > create and invidual width rule for that class.  When Protel exports
> > the DSN file , it will assign an INDIVIDUAL rule to the nets in the
> > class.  The same applies to via  type, toplogy, max via, and
> > clearance. Protel extracts the class and breaks it down to net.
> > That is perfectly fine ...perhaps cumbersome but it works.  You
> > still may want to look at this router.  ELecta is working on adding
> > High Speed rules
> >
> >
> > Mike Reagan
> > EDSI
> > Frederick MD
> >
> >

-- 
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