Hi, Netgen indicates our layout

Netlists match uniquely with port errors

I spent too much time analyzing the layout and didn't understand why netgen indicates that. The comp file contains the following

Cell INTERNAL_SDC_clean (0) disconnected node: SENS_IN
Cell INTERNAL_SDC_clean (0) disconnected node: REF_IN

But according to klayout "Trace All Nets", those signals are connected. I've shared the files required to get the result.

The ports are difficult for magic to resolve when they don't have any material underneath them in the cell where they are defined. The easiest way to solve this is just to draw a rectangle of metal at the location of these two pins, in the top level cell.

It worked... but at what cost So basically, if it says

Netlists match uniquely with port errors

or

disconnected node:

can I assume that always the problem will be related to missing conductor layers? Or there are other cases that trigger this warning?

"Disconnected node" by itself is not necessarily an error. The combination of that and the "port errors" message probably mean a port label problem. There are multiple ways to get port errors, but that's a common one.

So

Disconnected node

is not caused by differences with the schematic, it's more about the state of the port, if it's open. Thanks Tim