So does
spacing alldifflv,var alldifflv 270 touchi...
# magicp
Philipp Gühring
05/30/2021, 9:39 PMSo does
spacing alldifflv,var alldifflv 270 touching_ok "Diffusion spacing < %d (Diff/tap 3)"
mean
spacing alldifflv alldifflv 270 touching_ok "Diffusion spacing < %d (Diff/tap 3)"
spacing var alldifflv 270 touching_ok "Diffusion spacing < %d (Diff/tap 3)"
or does it mean
spacing (alldifflv OR var) alldifflv 270 touching_ok "Diffusion spacing < %d (Diff/tap 3)"
?
t
Tim Edwards
05/31/2021, 12:04 AMI don't see how those would be different.
p
Philipp Gühring
06/01/2021, 4:00 PMWhen you OR 2 layers together, you might "close" holes/notches and therefore you would get less DRC spacing issues.
t
Tim Edwards
06/01/2021, 4:28 PMYes, you are right. So it means (alldifflv OR var).
p
Philipp Gühring
06/01/2021, 5:09 PMYes, when I am seperating the rules I get additional DRC violations due to this semantic difference:
Philipp Gühring
06/01/2021, 5:13 PMSo my concept of expanding the DRC rules does not work. And it even seems that magic itself is conceptually not able to determine which layer specifically caused the issue.
Philipp Gühring
06/01/2021, 5:15 PMThat reminds me of Heisenberg, you can either know which layer is affected, or you can know which rule exactly applies, but you can't really know which polygon on which layer on which position exactly causes the DRC violation. Fascinating!
Philipp Gühring
06/01/2021, 5:19 PMBecause one single error- rectangle that magic flags a DRC issue could be actually caused by several pieces on different layers
Philipp Gühring
06/01/2021, 5:20 PMHmm, so there are several possible solutions:
Philipp Gühring
06/01/2021, 5:21 PMWe could cross-check the found DRC issues whether they are real DRC issues or fake DRC issues due to the exanding, and weed out the fake DRC issues first.
Philipp Gühring
06/01/2021, 5:24 PMOr we could keep the virtual DRC rules, and annotate them with all possible layers that could cause them, and just try to correct them on all the layers.