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From: Philippe Pouliquen (philippe AT alpha DOT ece.jhu.edu) Date: Tue Mar 04 2003 - 12:56:50 EST
Hi Svenn, > I have a gdsii file and wanted to use magic as a gdsii viewer for this > file. What you want to do is not entirely straightforward. Every layout needs to be viewed with an appropriate techfile, and you cannot arbitrarily read in CIF or GDS written by another layout tool. Perhaps some day, Tim will add a feature to automatically generate new planes and tiles on reading in layouts (bleah! don't forget the kitchen sink... :-) > These are not the only errors, but I guess they all come from the fact that > this gdsii has been written with a technology different from scmos. Right. If you're lucky, the style used to generate your GDS will match one of the styles provided by Jeff Sondeen (see the MOSIS web site for links to Magic techfiles). > Now, how can I quickly generate a tech file so that I can view a gdsii file > of unknown origin and technology? Or is this impossible as magic work with > tiles and planes? I will go on and make myself a dummy techfile according > to the maintainers manusl #2, but if anybody here already has done such > work and know about obstacles, I would be happy to hear about your > experience. I have attached a simple techfile which I use to convert to/from CIF and GDS. (Tanner L-Edit v7.00 does not write correct GDS, and our version of Cadence currently won't read CIF). You will need to make the following modifications: 1) You will need to add to the list of planes and types any missing layers. Don't forget to add an entry to the extract section for any plane you add. 2) You will need to modify the scalefactor in the cifinput section to suit the grid that was used to generate your GDS file. 3) This techfile doesn't define any colors for the tiles, so if you want to see anything, you will have to add entries to the styles section. This is not straightforward as some colors will erase others... 4) You might run out of planes... Philippe Pouliquen The Johns Hopkins University
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