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Magic Mailing List |
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From: Philippe O. Pouliquen (philippe AT alpha DOT ece.jhu.edu) Date: Thu Sep 27 2001 - 11:26:51 EDT
Tim Edwards wrote: > I'll give that some serious thought, as I have been occasionally > troubled by magic's habit of leaving gaps between cells when > shrinking layers (usually this means a well, and usually can be > ignored, but it's really not proper to assume that everybody "knows" > that you have to write CIF, read it back in verbatim, and check for > these kind of violations. It occurs to me, that I have seen magic fill in gaps between Nwells at the top level when writing CIF. That is, suppose that two neighboring cells have Nwells in them. If, in the parent cell, the well end up being closer than 9 lambda without touching, then a rectangle of Nwell gets generated in the parent which joins the Nwells of the two children. I remember this happening, because inevitably, this Nwell is too narrow (less than 10 lambda) and therefore generates a DRV (design rule violation). Was I halucinating? If not, then it seems that the gap can be filled in the parent, even though Jeff would prefer that the gap not be created in the first place. Philippe Pouliquen The Johns Hopkins University
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