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 > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[EMAIL PROTECTED] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
