what is the operation you were doing before the error?

Stefan Schippers

11/14/2021, 2:14 AM

what is the operation you were doing before the error?

Mayank Gupta

11/14/2021, 5:54 AM

Just made an inverter based off sky130 components

Mayank Gupta

11/14/2021, 5:54 AM

And I followed your video for the installation. I think my Ngspice is not able to find the files. Because the error seems to be with the simulator.

Stefan Schippers

11/14/2021, 10:34 AM

Yes but the dialog box is an error message from xschem. This should be fixed, if simulator fails xschem should just report the error. So i am trying to reproduce the same situation, even by inserting syntax errors in the ngspic commands...

Mayank Gupta

11/14/2021, 10:40 AM

Hey Stefan, I just reinstalled the Xschem using the video you made about Xschem+sky130 pdk

Mayank Gupta

11/14/2021, 10:41 AM

The previous error is gone. Now I get error with Ngspice where it just can't find libraries.

Stefan Schippers

11/14/2021, 10:53 AM

@User Thanks to your bug report i have fixed the xschem error. This error does not happen always but it was a bug in xschem. I have pushed a commit to github, so if you update and rebuild xschem (

git pull

and

[sudo] make install

) the first problem is gone. I can not tell about the ngspice error. This is probably related to ngspice not being able to find the models. Ensure the '`.lib`' instruction in the netlist is pointing to the correct location of models. Thank you for reporting the problem!.

Mayank Gupta

11/14/2021, 10:54 AM

That's awesome. Thanks again, I will try fixing the Ngspice error

Stefan Schippers

11/14/2021, 10:55 AM

If you send me the .sch circuit and/or the netlist i can try here,

Mayank Gupta

11/14/2021, 10:56 AM

Okay lemme send that.

Stefan Schippers

11/14/2021, 10:56 AM

Great! thanks. User feedback is really important, good for discovering bugs -:)

😁 1

Mayank Gupta

11/14/2021, 10:59 AM

Here's the spice netlist I have. I followed the steps that were about patching the sky130_fd_pr_ngspice

Mayank Gupta

11/14/2021, 11:00 AM

And that's the error. While I have checked that these files exist in the.directory mentioned.

Mayank Gupta

11/14/2021, 11:00 AM

I think it's worth mentioning that when I installed sky130pdk, the folder was created at usr/local/share/pdk/sky130A

Stefan Schippers

11/14/2021, 11:08 AM

please go to the directory containing the netlist (in the .xschem/simulation directory) and create a .spiceinit file with following content:

Copy code

set ngbehavior=hsa
set ng_nomodcheck

then try again the 'Simulate' button...

Stefan Schippers

11/14/2021, 11:10 AM

And next, do not include the skywater-pdk directory, you should do a :

Copy code

.lib /usr/local/share/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice tt

Mayank Gupta

11/14/2021, 11:15 AM

Okay, just did these steps. Waiting for the results. Also I should mention I am really grateful for all the help. I am very new to all this, so I sure am making a lot of mistakes. Thank you

Mayank Gupta

11/14/2021, 11:15 AM

IT WORKED 🥳🎊

Stefan Schippers

11/14/2021, 11:15 AM

You can press 'q' on the component defining the models and replace the .lib with the line i posted above.

👍 1

Mayank Gupta

11/14/2021, 11:15 AM

IMG_20211114_164520.jpg

Stefan Schippers

11/14/2021, 11:16 AM

getting better!

Stefan Schippers

11/14/2021, 11:16 AM

Thank you for reporting the xschem bug!

😁 1

Mayank Gupta

11/14/2021, 11:16 AM

Yeah, I am glad I could find something that helped

Mayank Gupta

11/14/2021, 11:16 AM

Wow. I spend like 2 days on this. Finally worked I am so happy 😂

Mayank Gupta

11/14/2021, 11:17 AM

Thanks again Stefan

Stefan Schippers

11/14/2021, 11:17 AM

you are welcome.

😁 1

Argonaut

11/15/2021, 5:46 AM

@User: why isn't the comparability mode printed while @User is running the example?

Mayank Gupta

11/15/2021, 8:00 AM

@User is def because of the options I have set in the configure tools for simulation. I changed it a bit as per instructions by. Stefan in his installation video.

Stefan Schippers

11/16/2021, 11:07 AM

@User, i don't understand the question. What are you referring to? Thank you

Stefan Schippers

11/16/2021, 11:11 AM

@User, you are probably referring to this line printed while ngspice is running?

Compatibility modes selected: hs a

this is printed if you create a

.spiceinit

file in the directory where the netlist is created and simulator is running (Typically

~/.xschem/simulations

if not changed by user). the

.spiceinit

file is just 2 lines to specify some behaviour about model syntax and Hspice-like compatibility:

Copy code

set ngbehavior=hsa
set ng_nomodcheck

This file also allows ngspice to speed up model parsing considerably.

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