open-source-silicon.dev

I'm experimenting with exporting spice from xschem and then into magic. Is there an xschem component I can use that will create port pins in magic? Right now I'm having to create all the ports manually in magic

image.png

like it would be nice if this got turned into a labelled port in magic somehow

<@U0172QZ342D> xschem generates metadata in the netlist (in the form of commented lines) to indicate all nets that have an input, output or inout port:

```**.subckt bandgap START CLK EN_N VBG VCC VSS
*.ipin EN_N
*.opin VBG
*.ipin VCC
*.ipin VSS
*.ipin CLK
*.ipin START```
or the CDL syntax (In LVS mode) :
```.subckt bandgap START CLK EN_N VBG VCC VSS
*.PININFO EN_N:I VBG:O VCC:I VSS:I CLK:I START:I```
In the above `:I` means input, `:O` means output and `:B` means inout.
I think this information could be used easily. If there is a need for a different syntax it is easy to change.

<@U016EM8L91B> If there is a schematic equivalent for a *port pin* in magic I can easily add that. Don't know if it makes sense, like if it is considered a device that should match in LVS.

<@U01819B63HP> (<@U0172QZ342D>):  If the ".subckt" line is included in the netlist, then the pin names will automatically be turned into ports in magic when the netlist is imported.
I could add handling of the metadata in xschem or CDL to annotate the port with the direction, because otherwise that has to be done manually before writing LEF.

ok, so I need to set that option for LVS as we discussed recently, then it should happen