@User: This is a known error that has an issue logged in the skwater-pdk repository on github. The bottom line is that Calibre, for unknown reasons, does not flag this as an error, in spite of measurements showing that it is, in fact, in violation of the rule. Because Calibre doesn't flag it, using it in a design won't get rejected by SkyWater (although it will probably cause issues with efabless' precheck). I have a patched version of the GDS for that cell and a few others in the library. I had trouble with getting open_pdks to swap in the modified version before it creates the GDS library, and I need to modify some of the open_pdks install scripts; I was working on that last week but it got preempted by other issues. However, you can find the GDS in the open_pdks repository at

sky130/custom/sky130_fd_sc_hd/gds/sky130_fd_sc_hd__a2111oi_0.gds

if you want to replace the existing GDS with the corrected one.

Is it just

sky130_fd_sc_hd__a2111oi_0.gds

? @Tim Edwards If yes then I can simply exclude this from the design during synthesis and this should solve the problem.

The only other cell that has a similar problem that might be used by synthesis is

sky130_fd_sc_hd__buf_16

.

Thanks, I excluded the cell and the DRC went to 0 as expected