Hi, I'm programming a script to make the padring with python and klayout. • I'm using as reference the

RING_PAD

in

openfasoc-tapeouts

, but I think there must be a guideline that I could use to design the padring. Also, i think there should be more padrings examples • Should I use the gds in

$PDK_ROOT/gf180mcuD/libs.ref/gf180mcu_fd_io/gds

or the ones in primitives repo

globalfoundries-pdk-libs-gf180mcu_fd_io/cells

? I suppose both are equal. • I work on analog, but maybe all of this is already done in openlane. There's a gf180 guide for padring design in openlane?

The GDS of the I/O pads is the same between the repository source and PDK, with the minor caveat that open_pdks is currently using the repository fork at https://github.com/efabless/globalfoundries-pdk-libs-gf180mcu_fd_io, where I made a few changes to the GF corner I/O cell to remove paths with (interior) off-grid points that were causing issues with magic. The mask-level layout is the same, regardless.

So both efabless fork and open_pdks (volare) are the same and got that offgrid problem fixed. If that's the case I don't need to clone the fork, all is on the volare installation. Thanks Tim. Somebody recommends me this project, Have you heard about it?