Is there an explanation anywhere of what the maskA...
# sky130k
Keno Fischer
05/03/2021, 5:34 AMIs there an explanation anywhere of what the maskAdd/maskDrop layers do? I tried to find it but came up empty (just idle curiosity browsing the GDS)
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Matthew Guthaus
05/03/2021, 1:14 PMThese are OPC layers. They adjust the layers for improved printing by increasing or decreasing the size of the mask or adding assist features.
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Keno Fischer
05/03/2021, 5:36 PMThanks for confirming. Is there a reference anywhere on what exactly the effect on the resulting mask is? Just to satisfy my curiosity
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Matthew Guthaus
05/03/2021, 5:37 PM@Ken Pettit They have not released the lithography information, so no.
Matthew Guthaus
05/03/2021, 5:37 PMI've been asking to verify some of the SRAM OPC
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Keno Fischer
05/03/2021, 5:38 PM(Wrong user name ;) ). Thanks! I'll keep an eye out if that ever gets released
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Matthew Guthaus
05/03/2021, 5:38 PMoops. Sorry @Ken Pettit I meant @Keno Fischer
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Keno Fischer
05/03/2021, 5:39 PMBTW, will there be an OpenRAM update for sky130? I've been playing with your pre-compiled macros, but wanted to play around with some settings
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Matthew Guthaus
05/03/2021, 5:41 PMThis is the plan. I'm trying to iron out the supply routing with the OpenLane flow right now and then I will probably release the build space. Right now PDN cannot connect to the supply since it has specific requirements.
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Keno Fischer
05/03/2021, 5:42 PM👍 looking forward to it. Happy to play with it even if it's not 100%, but I know the perils of releasing unfinished software, so I'm happy to be patient :)
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Matthew Guthaus
05/03/2021, 5:43 PMYeah 🙂