For the

skywater-pdk-libs-sky130_fd_sc_hd

cells the

sky130_fd_sc_hd__diode_2.spice

model makes reference a SPICE diode card called

sky130_fd_pr__diode_pw2nd

from the

skywater-pdk-libs-sky130_fd_pr

primitives. On searching the primitives I find a few variants on

sky130_fd_pr__diode_pw2nd

(e.g.

sky130_fd_pr__diode_pw2nd_05v5

,

sky130_fd_pr__diode_11v0

, etc.) Should

sky130_fd_sc_hd__diode_2.spice

be calling one of those in particular?

The

open_pdks

installer corrects this error to the

05v5

device.

Gotcha,

skywater-pdk-libs-sky130_fd_sc_hd

 also seems to think

sky130_fd_pr__diode_pw2nd_05v5

should be exposed as a subcircuit instead of the model card provided by

skywater-pdk-libs-sky130_fd_pr

how does the open_pdks installer resolve this?

open_pdks also changes the record from X to D.

No need to get any fancier?

They're just parasitic diodes. They don't seem to have any particularly special models for them other than the basic SPICE diode model.