Hi Jeff, El lun, 11-06-2007 a las 21:55 -0700, Jeff Trull escribió: > Hi all, > > I'm consulting for a small ASIC startup that is interested in gEDA. They > have > a handful of licenses for expensive commercial tools but were looking for a > low-overhead way to do some semi-custom work and asked me to investigate. I > just went through the process of figuring out how to make symbols for the > third-party standard cell libraries they've licensed, and I thought I'd share > my experiences since I couldn't find this described on the net anywhere. > > Among the provided views of this library are ones for Cadence's Composer > product. It turns out Cadence supplies a tool called "edifout", which will > produce an EDIF (text) version of any cell view. You need to supply a > template file, which Cadence helpfully provides an example of > (tools/dfII/samples/xlUI/edifOut.il). I wrote a Perl script that just runs > this once for every cell in the library, although some people recommend > building a huge schematic with every cell in it, and then running edifout > just once. With my approach you do need to generate a new template file each > time, specifying a different cell (and you want the "symbol" view). > > Now you have EDIF for each cell's symbol view. From here I tried to find > some > kind of public-domain parser, but everything was a dead end. Then I realized > that EDIF looked kind of like Lisp - i.e., an "s-expression". It turns out > there's a CPAN module for parsing s-expressions called Data::SExpression, so > I could suck in the whole file and treat it as a data structure (lists of > lists). I did have to do a few day's worth of coding on top of this to > generate the gschem symbols - the EDIF can be complex and the vendor > libraries are quirky.
This could be a path other people may be interested in. If you are willing to share the scripts, they may be incorporated into gaf utils package. Of course, if there is no licensing/patent conflicts... Regards, Carlos _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
