Hey everyone, I'm trying to figure out if it is possible to use custom-standardcells with mimcap (connection on met4). Metal4 is in the LEF file under OBS. Does anyone know a way to get this running in openlane without using metal5? Goal: hardened macro. At the moment I get metal4-metal4 overlaps under the PDN rails

definetly hard to do with srandarcells. Maybe if it is a macro block?

Actually tried it as a macro-block first, but found there are offsets between the macros and I need to make sure they all touch 2 rails of the core-PDN on met5. A bigger macro-block-size is a possible solution, indeed, but I'd prefer to get a smaller standard-cell working. My alternative is a cell with Poly-Substrate Cap. With mimcap it would just be more efficient

Standard cell flow is hard to do. I would recommend sticking with macro-block and just decreasing step of the PDN grid.

Yes it's hard, but my macro is hardened when it's done. (sorry for dad joke) I principally have to stay with standard cells, it's a special use-case for research in a mixed-signal design, and I got the flow working already, just not with mimcaps. As you suggest, a macro cell would likely make sense, but then we could just do it with the analog workflow instead