Hmmmm I'm trying to do LVS and at this point I'm not sure if I'm having a magic problem, a spice problem, a klayout problem, or some other problem. I'm running @Amro Tork’s https://github.com/mabrains/sky130_klayout_pdk/blob/main/scripts/run_standard_lvs.py script, on my gds file https://github.com/pepijndevos/sky130_lvds which shells out to @Tim Edwards’s magic and netgen. My gds is very incomplete, but I just want to get all the things working before I go all the way and have to ge back and fix a million things. So I made this dummy schematic of just the mosfets I drew

* schematic.cir
* .lib /usr/local/share/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice tt
XM3 cm V- bufneg VDD_IO sky130_fd_pr__pfet_g5v0d10v5 l=0.5 w=10 m=10
XM2 cm V+ bufpos VDD_IO sky130_fd_pr__pfet_g5v0d10v5 l=0.5 w=10 m=10

And then I ran

python ../sky130_klayout_pdk/scripts/run_standard_lvs.py lvds.gds output.txt schematic.cir report.txt TOP

which generates some

.ext

files as well as write some spice to

output.txt

* NGSPICE file created from TOP.ext - technology: sky130A

.subckt sky130_fd_pr__pfet_g5v0d10v5_VU6JZ7 a_50_n1036# w_n144_n1098# a_n50_n1062#
+ a_n108_n1036#
X0 a_50_n1036# a_n50_n1062# a_n108_n1036# w_n144_n1098# sky130_fd_pr__pfet_g5v0d10v5 ad=2.9e+12p pd=2.058e+07u as=2.9e+12p ps=2.058e+07u w=1e+07u l=500000u
.ends

.subckt TOP
Xpfet_g5v0d10v5_7x05[0|0] m1_n102_n1172# w_n1336_n1674# m1_n66_1210# m1_n102_n1172#
+ sky130_fd_pr__pfet_g5v0d10v5_VU6JZ7
Xpfet_g5v0d10v5_7x05[1|0] m1_n102_1628# w_n1336_n1674# m1_n66_4010# m1_n102_1628#
[...]

But that's where the happiness ends. There was an error message from magic, but maybe it can be ignored?

Error while reading cell "$$$CONTEXT_INFO$$$" (byte position 338): Cell "contact" was already defined in this file.
Error while reading cell "$$$CONTEXT_INFO$$$" (byte position 338): Ignoring duplicate definition

But then comes the netgen part and here it completely goes of the rails. If I add a

.lib

statement it just gives an error, and if I don't, it seems to generate a dummy device and then complain that it doesn't have any properties:

Netgen 1.5.224 compiled on vr 24 jun 2022 10:27:18 CEST
Warning: netgen command 'format' use fully-qualified name '::netgen::format'
Warning: netgen command 'global' use fully-qualified name '::netgen::global'
Reading netlist file output.txt
Call to undefined subcircuit sky130_fd_pr__pfet_g5v0d10v5
Creating placeholder cell definition.
Reading netlist file schematic.cir
Call to undefined subcircuit sky130_fd_pr__pfet_g5v0d10v5
Creating placeholder cell definition.
Reading setup file /usr/local/share/pdk/sky130A//libs.tech/netgen/sky130A_setup.tcl
Model sky130_fd_pr__pfet_g5v0d10v5 pin 1 == 3
No property mult found for device sky130_fd_pr__pfet_g5v0d10v5
No property sa found for device sky130_fd_pr__pfet_g5v0d10v5
No property sb found for device sky130_fd_pr__pfet_g5v0d10v5
No property sd found for device sky130_fd_pr__pfet_g5v0d10v5
No property nf found for device sky130_fd_pr__pfet_g5v0d10v5
No property nrd found for device sky130_fd_pr__pfet_g5v0d10v5
No property nrs found for device sky130_fd_pr__pfet_g5v0d10v5
No property area found for device sky130_fd_pr__pfet_g5v0d10v5
No property perim found for device sky130_fd_pr__pfet_g5v0d10v5
No property topography found for device sky130_fd_pr__pfet_g5v0d10v5
[...]

And then the report is just

Equate elements:  no current cell.

Equate elements:  no current cell.
Verify:  no current cell to verify.

OK. First let's make your schematic netlist a subcircuit

* schematic.cir
* .lib /usr/local/share/pdk/sky130A/libs.tech/ngspice/sky130.lib.spice tt
.SUBCKT TOP VDD_IO V- V+ bufneg bufpos
XM3 cm V- bufneg VDD_IO sky130_fd_pr__pfet_g5v0d10v5 l=0.5 w=10 m=10
XM2 cm V+ bufpos VDD_IO sky130_fd_pr__pfet_g5v0d10v5 l=0.5 w=10 m=10
.ENDS

Then add some pins to your layout

V- V+ VDD_IO bufneg bufpos

. Your netgen command to run lvs should be something like

netgen -batch lvs "extracted.spice TOP" "schematic.spice TOP" $PDK_ROOT/sky130A/libs.tech/netgen/sky130A_setup.tcl

You can ignore the duplicate cell and missing parameter messages.

Then add some pins to your layout

V- V+ VDD_IO bufneg bufpos

.

how do I do that in klayout?

Use a pin layer to define the shape and then place the text on the same layer inside. Make sure the pin layer is totally enclosed within the drawing layer.

So what's the difference between pin and label?

pins are generally extracted as subckt ports. labels can be used to name nets. You can change the border color of the layer to something darker for better text visibility.

@Pepijn de Vos: I had to do some weird things with pin and text purposes, because there were two SkyWater libraries that used different purposes for pins; one of them may have just been a mistake, but I wrote the tech file for magic to accept both forms so that I could get the pins defined for all of the libraries.