Can assign top cell as a circuit by ruby script?

Vincent Lin

Hello Matthias

Is it possible to assign top cell as a circuit by ruby script, if I want to use those powerful feature in circuit class?
NetTrace class works well, but It's a pity that useful functions didn't come in handy, in package level.

I guess I can also set subcircuits in the layout if it become complex.

thanks
Vincent

Matthias

I sorry, I think I need a little more explanation.

What exactly are you trying to do?

NetTrace is somewhat obsolete now. There is LayoutToNetlist which can turn all nets of a cell into a circuit including subcells. That is embedded into the DRC/LVS engine, so you can code layout to netlist tracers with a few lines of code. See for example here: https://www.klayout.de/forum/discussion/comment/11351.

Matthias

Vincent Lin

Hello Matthias,

I am sorry, it seems not that easy as I thought if the circuit/device class just be embedded into
DRC & LVS engine. That's why I can not find out the relationship and build it by just Ruby script.

NetTrace is a handy way, if someone want to do extra action after the mismatch was detected.
for example, there is one net in the layout, and somehow the via is missing, then no element
belongs to via layer will be found in that net, and via can be re-arrayed as below code

tech = NetTracerConnectivity.new
tech.connection("1/0", "2/0","3/0")

tracer = NetTracer.new
tracer.trace(tech, layout, cell , point , layer)
for element in tracer.each_element
  if element.layer == via_layer
    area = element.shape.area
  end
  if area == 0 # area = 0 means via is missing
    cell.shapes(via_layer).insert(box) #  insert the box as a via you want to renovate the net 
  end
end

By NetTrace, you can do something intuitional if the situation you set happen
thanks for your reply that circuit/device class features belong to DRC & LVS engine
I can stop trying now... DRC & LVS engine are powerful, but I am still an amateur.

thanks
Vincent