#435 Sky130 tech LEF: Add (dummy) CUT layer after wells? Issue created by ubfx Hello everyone, this topic was briefly discussed in the early phases of PDK release on the google repos. Since things have stabilized a bit now and open_pdks has pretty much taken over the role of the "golden" PDK while the google repos are dormant, I'd like to bring it up again here. The issue is that with the addition of

pwell

and

nwell

layers to the tlef (quite a while back), they're not compliant with the LEF/DEF standard anymore because they're missing a CUT layer to the local interconnect. Although OpenROAD seems to handle this without problems, certain commercial tools don't. I understand that the focus of the PDK is to enable the Open Source tools (which is also what I'm working on), but in practice, it's still useful to be able to run the commercial tools for cross-checking. And judging by github issues on the old repos, there's certainly interest to get the PDK running on the commercial tools. I also know that it's quite simple to fix locally either by following the advice in the old PR below, or just by adding a dummycut layer between

pwell

and

li1

, but the fragmentation of the PDK into 20 variants with slightly different patches doesn't help the cause. So my question: Could we add poly+cut or just a dummy cut layer between

pwell

and

li1

in the master tlefs? Original Issue: google/skywater-pdk#308 PRs: google/skywater-pdk-libs-sky130_fd_sc_hd#4 google/skywater-pdk-libs-sky130_fd_sc_hd#3 RTimothyEdwards/open_pdks