• sky130_fd_sc_hs (high speed) • sky130_fd_sc_ms (medium speed) • sky130_fd_sc_ls (low speed) • sky130_fd_sc_lp (low power) • sky130_fd_sc_hd (high density) • sky130_fd_sc_hdll (high density, low leakage) • sky130_fd_sc_hvl (high voltage)

Main advantage of

hd

and

hvl

might be that the libraries are prebuilt in the volare pdk. I think you’ll have to build the other ones yourself.

hvl

is the only library that supports voltages above 1.8V.

This should help to relate https://www.vlsisystemdesign.com/ppa-power-performance-area-card/