Hello, does anyone know why the lvs says that the circuits are black boxes?

For netgen compares 2 subcircuits. For the sky130 PDK, primitive mosfet devices are extracted as subckt references. (The spice lines begin with

X

. ) There is no subckt definition for these devices, so netgen compares them as black boxes - the device names and the terminal connections must match. This is normal behavior. The

equate elements: no current cell

is worrisome, though. Can you post your

inverter_mag.spice

,

inverter_spice

, and netgen command?

The

equate elements

output suggests that the

equate elements

command has been added to the setup file, probably in error.

equate elements

and

equate nodes

are very obscure, low-level commands that can only be used in the middle of running a comparison. They cannot be used in a setup file because the circuits have not yet been partitioned into nodes and elements.

Netgen -bash lvs inverter_mag.spice inverter.spice

I assue you mean

-batch

, not

-bash

. You also need to specify the netgen setup file, such as

/usr/share/pdk/sky130A/libs.tech/netgen/sky130A_setup.tcl

.

Yes, I’m sorry, is netgen -batch lvs inverter_mag.spice inverter.spice and route sky130A_setup.tcl

Please post the

comp.out

output file?

comp.out

You are comparing a subcircuit against a top level. The simplest thing to do is to write the netlist from xschem using the "output subckt" option so that it gets a ".subckt" line and all the pins are declared (those are in the file and you can also just edit the file and remove the

**

from the

.subckt

and

.ends

lines). Then, run the LVS with the name of the subcircuit declared:

netgen -batch lvs "inverter_mag.spice inverter" "inverter.spice inverter" /usr/share/pdk/sky130A/libs.tech/netgen/sky130A_setup.tcl

@Juan Andres When you output your netlist from xschem, be sure to select

Simulation -> LVS netlist: Top level is a .subckt

I did this but I have the same error

You just want to make sure that the option

Top level is a .subckt

is set, and then click on

Netlist

as usual; then your netlist should have uncommented

.subckt

and

.ends

lines in it. It really is doing nothing more than just not writing the comment characters in front of those lines. Otherwise, the netlister is behaving exactly the same.

But I have issues in the lvs yet

You seem to be comparing the layout against some version of itself, not against the xschem schematic.

No, are this

This should be your lvs command

netgen -batch lvs "inverter_mag.spice inverter" "inverter.spice inverter" $PDK_ROOT/$PDK/libs.tech/netgen/${PDK}_setup.tcl