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Magic Mailing List |
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From: Andrew Lines (lines AT avlsi DOT com) Date: Fri Mar 30 2001 - 14:27:39 EST
Yes, the problem is that CIF rectangles are center specified, so the center must line up on a centimicron grid. So if you have odd sized rectangles and an odd lambda, you're in trouble. Naturally, CIF write gives no warnings, so you just get a mask set with lots of tiny gaps. You should use calma write instead. This produces a .strm (GDS2) output, which is more widely supported by foundries and does not have the same limitation. I belive MOSIS accepts GDS2 as well as CIF. Unfortunately, GDS2 writing from Magic tends to munge your namespace pretty badly and GDS2 reading is mostly broken, so you run into some other problems. If somebody would volunteer to implement better Magic -> GDS2 -> Magic name conversion, using escape sequences legel in GDS2, and making sure the GDS2 labels are connected back to the correct magic layers, I'm sure people would appreciate it. Oh well, we've switched to CADENCE tools anyways (and believe me, that has some serious pain associated with it).
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