PDN gen appears to silently ignore -starts_with in define_pdn_grid

[jeffng-or]

Subject

Describe the bug

Found with proprietary PDK, but repro's with ASAP7 PDK

If the ASAP7 PDN gen script is updated from:

define_pdn_grid -name {top} -voltage_domains {CORE} -pins {M6}

to:

define_pdn_grid -name {top} -voltage_domains {CORE} -pins {M6} -starts_with POWER

Shouldn't the bottom-most M1 rail be VDD and not VSS? It's not:

Expected Behavior

If the -starts_with is ignored for some reason, we might want to log it and why.

Environment

orfs git commit tag: c9c22caf9bf9cfe46c5a4236c6ec7e7ae9863cc3

To Reproduce

mkissue tarball: https://drive.google.com/file/d/1nWdbR5GFE3S2eBDfHjN5aCBOEunPQA_r/view?usp=drive_link

Relevant log output

Screenshots

No response

Additional Context

No response

[maliberty]

I'm assuming that is an m1 follow pin strap which has to follow the row orientation. That flag would only have effect on upper non-followpin layers. Probably a warning is needed but not a bug fix.

[maliberty]

I'm guessing you need -flip_sites on initialize_floorplan