Hello everyone. I'm new to the open pdk (skywater130 pdk) technology and I'm currently facing some simulation issues. After installation I tried designing a simple CMOS inverter(screenshot of the schematics is attached) to get used to the software commands and interface. When I tried simulation I got this error message:

Error: Could not find include file ../../../libs.ref/sky130_fd_pr/spice/sky130_fd_pr__nfet_01v8__tt.pm3.spice
Error: Could not find include file ../../libs.ref/sky130_fd_pr/spice/sky130_fd_pr__res_generic_nd.model.spice
Error: Could not find include file ../../../../libs.ref/sky130_fd_pr/spice/sky130_fd_pr__special_nfet_latch__mismatch.corner.spice
Note: Compatibility modes selected: hs

Circuit: ** sch_path: /home/emmanuel-innocent/designs/examples/inverter.sch
Error: unknown subckt: xm1 inv_out vin 0 0 sky130_fd_pr__nfet_01v8 l=0.15 w=1 nf=1 ad={int((nf+1)/2)*w/nf*0.29} as={int((nf+2)/2)*w/nf*0.29} pd={2*int((nf+1)/2)*(w/nf+0.29)} ps={2*int((nf+2)/2)*(w/nf+0.29)} nrd={0.29/w} nrs={0.29/w} sa=0 sb=0 sd=0 mult=1 m=1
    Simulation interrupted due to error!

After I got the message I decided to check the

spice

subfolder in the skywater130 primitive device folder through the path

/usr/local/share/pdk/libs.ref/sky130_fd_pr/spice

and I discovered that the

spice

sub-folder that's suppose to be in the

sky130_fd_pr

folder is missing. Maybe that's why ngspice raised the "could not find include file" error. This seems to have been caused perhaps because one step or the other was skipped during installation of the pdk. But I can say for sure I did not make any mistake during installation because I followed the instructions from the open PDK website ( Open_PDKs ) to compile and install from source. In fact, I've correctly uninstalled and re-installed the pdk about 3 times now. But I still get similar error. Even when I tried running the pdk simulation examples I still get similar error with model or spice file not being found. Please I need your assistance to get this problem solved so I can start working with the PDK. Thank you.

In some cases after doing the

./configure --enable-sky130-pdk

doing

make

two times before

sudo make install

fixes the missing paths/files.

@Emmanuel Innocent Make sure your

PDK_ROOT

is set to a absolute path and not a relative path. Normally, the directory would look like

/usr/local/share/pdks/sky130A/libs.ref/sky130_fd_pr

. There should be a technology between thee

PDK_ROOT

and

libs.ref

.

Thank you. I've uninstalled the pdk. The

/usr/local/share/pdks/sky130A/libs.ref/sky130_fd_pr

contained only 2 sub-folder (namely

mag

, and

gds

). The folders

spice

,

model

etc were missing.

Is this error due to Miniconda install step ?

bash-4.2$ bash /data/work/open_pdks/sources/sky130-pdk/env/downloads/Miniconda3-latest-Linux-x86_64.sh -p /data/work/open_pdks/sources/sky130-pdk/env/conda -b -f 
PREFIX=/data/work/open_pdks/sources/sky130-pdk/env/conda
Unpacking payload ...
bash-4.2$ echo $?                                                                                                                                                                                       
1
### The exit status here is non-zero causing Make to fail ?

Has someone reported this issue ? The issue being, the installer shell archive has a non-zero exit status without displaying a reason.