Hi @Stefan Schippers, we are looking for the following xschem netlisting feature, not sure, if this is already existing. We would like to be able to netlist for LVS with certain elements removed (leaving the connecting wires open or short-circuit). Means, we need • a cmdline switch to indicate netlisting for LVS • an lvs_ignore property on symbols, which can be set to none/short/open (none doing nothing, short = remove element, short nodes, open = remove element, keep wires floating) Is this someting you could implement? That would be very helpful!

@Harald Pretl That is interesting. There is already something in place for this. I am looking at it and will come with a solution for that. There are some low level commands to do this, but I want an easy interface. WIll keep you updated.

I think we can restrict to simple cases, as mostly this will be used for elements like R/L/C (parasitic modelling) or sources (for stability simulation). So with mostly 2-terminal devices in mind, a simple remove-and-short or remove-and-keep-open should be sufficient.

ok, thank you, will look at a simple solution for this.

@Stefan Schippers Super! That is a perfect implementation! I’ll try it the next week on our design, first I need to put the latest xschem with this changes into our Docker image, but that looks really promising. BTW, the flag

top_subckt

is fully retired now? Means, I do now a

set lvs_netlist 1; set lvs_ignore 1

, correct?

Of course that needs some testing. I am doing that on my side too, so don't rush it into production immediately 🙂 (i mean the new features, i don't expect regressions due to this).

@Stefan Schippers The new

lvs_ignore

feature works like a charm 😄 I built the latest

xschem

and tested it on our SAR ADC, and now the LVS is passing w/o hand-manipulation of the netlist. Thanks!

Wow, that's nice. Thanks for testing that immediately