but I have contents in the magic_ext2spice.feedbac...
# mpw-one-clean-shortm
Matt Venn
01/29/2021, 1:12 PMbut I have contents in the magic_ext2spice.feedback.txt file: feedback add "Illegal overlap (types do not connect)" medium
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Amr Gouhar
01/29/2021, 1:59 PM@Matt Venn: Are you still using the old Fake Diodes?
m
Matt Venn
01/29/2021, 2:02 PMyes, just looking at metal5 short for now
Matt Venn
01/29/2021, 2:02 PMah, this could be to do with that as well.
Matt Venn
01/29/2021, 2:02 PMgood call, I'll update and run again
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Amr Gouhar
01/29/2021, 2:03 PM@Matt Venn: Yeah that's probably it. The old fake diodes would flag the illegal overlaps as well
j
jeffdi
02/02/2021, 7:39 AM
hi @Matt Venn any update? should we re-pull your project and run again?
m
Matt Venn
02/02/2021, 7:39 AMNot yet
Matt Venn
02/02/2021, 7:40 AMI have made some progress but not pushed anything
Matt Venn
02/02/2021, 9:21 AMwith @Ahmed Ghazy help I have fixed the overlap and shorts errors
Matt Venn
02/02/2021, 9:22 AMbut I'm concerned about antenna issues with my aggregated designs
Matt Venn
02/02/2021, 9:22 AMI didn't realise this before but antenna rules aren't checked at the macro level. So I have 8 blocks inside the user project area, all connected with long wires
Matt Venn
02/02/2021, 9:24 AMIf this is going to be a show stopper for all the designs then I'd like to fix this somehow, but need some help to understand how serious an issue it is and how to manually place antenna diodes at the inputs to all the modules
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jeffdi
02/02/2021, 11:21 PM
@Matt Venn we have not been chasing antenna errors and are choosing waive them since they only affect yield. is there a particular concern you have relative to your design(s)?
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Matt Venn
02/03/2021, 9:12 AMHere's my user project wrapper:
Matt Venn
02/03/2021, 9:12 AMlong interconnecting wires
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jeffdi
02/03/2021, 3:22 PM
@Tim Edwards any concern? ^^^
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Tim Edwards
02/03/2021, 3:46 PM@jeffdi: Well, I can't see squat from the screenshot. Tolerance of antenna violations is up to the user; I've been recommending users to do something about antenna violations that are more than 2x the recommended ratio limit, but I have no actual yield data, so it's up to the user to assume the risk.
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Matt Venn
02/03/2021, 3:47 PMI had a chat with @Ahmed Ghazy about it and it seems that with the current tools the best I can do is use diode strategy 1 to make sure antenna diodes are on all the inputs
Matt Venn
02/03/2021, 3:47 PMbut my point is that the distance between the macros is greater than the distance inside the macros
Matt Venn
02/03/2021, 3:48 PMand afaik we are not checking antenna rules at user_project_wrapper. so a long wire there could cause an issue that isn't ever checked
Matt Venn
02/03/2021, 3:48 PMam I making any sense?
Matt Venn
02/03/2021, 3:48 PMbtw @jeffdi I am making good progress, should have it pushed tomorrow
Matt Venn
02/04/2021, 1:23 PM@jeffdi my repo is updated: https://github.com/mattvenn/caravel-mph
Matt Venn
02/04/2021, 1:23 PMmpw-check is failing with 75 DRC
Matt Venn
02/04/2021, 1:23 PMas expected
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