Opening a L2N database created with custom devices

srooks10

Hi,

I'm experimenting with writing custom extractors for a LVS deck. For debugging, I would like to check the netlist without a compare stage., but the L2N netlist currently produced cannot be imported by the netlist viewer.

My experiment is actually closely following the example Matthias shared at https://gitlab.com/klayoutmatthias/fsic-2022-demo-files/-/blob/main/klayout-talk/lvs/custom_device/ . The same issue can be reproduce with the example, by following the steps:

• Edit lvs.lylvs to add report_netlist("extracted.l2n"), say after line 25:
• Run the LVS script.
• Now open the gds and load extracted.l2n in the GUI with Tools > Netlist Browser. This fails with the message Invalid device class template: in line: 23 of [...]/lvs/custom_device/extracted.l2n.

That line 23 is

K(MOSCAPN ''

The right most string is an empty string and the LayoutToNetlist reader doesn't like it. What is missing in the code of the example to generate a valid L2N file ?

Thanks,

Seb

Matthias

Hi @srooks10,

thanks for this nice problem description.

This is a bug of the reader. It should turn the empty string into a generic device, which is does not. This issue is probably easy to fix.

I have created a ticket for this problem: https://github.com/KLayout/klayout/issues/1696

Matthias

srooks10

Hi Matthias,
The fix works, I'm able to load the netlist now.
Thank you!
Seb

Matthias

Very good. Thanks for the feedback!

I am going to release the fixed version soon.

Best regards,

Matthias