Mark Net in Virtuoso-L

Rather hard to see what the original layout looked like, but the large regions at the right and bottom, what layer are they one? Is it some purpose of M2 or M3 (rather than a specific blockage object)? If so, since the mark net is set up to be layer based, it's going to see those as being the same materials:

Hi Andrew and thank you for your answer

As aforementioned this layer is an overlay of exclude layers and they have nothing to do with the pwr_i net I am trying to highlight.

I know this is rather hard to see the misc. layers but I can provide any information/screenshot if needed.

Thanks.

So what is that white-ish/yellow-ish layer (in the area which I drew the red highlight around)? You said "exclude layers" but I don't know what they actually are? I suspect they are key to the problem.

Andrew.

These are all available metals + OD + PO exclude layers, all of them.

I was wondering, though, if there could be a shortcut between the M2 drawing layer and the M2 exclude layer... Maybe this is a hint. Do you think there is a way to exclude some layers from those that I want to highlight ?

In this screenshot I show only M2 drawing and M2 exclude layers:

The "exclude" layers are the layers we add to avoid the automatic filler tool to add dummy layers (metals, poly, active, ...) to meet the min density rules.

I have found the answer.

In the MarkNet option window > Options tab, one can simply add "exclude" in Exclude Purposes, and it does the job fine:

End of the story.

Thanks for your help!

I have found the answer.

In the MarkNet option window > Options tab, one can simply add "exclude" in Exclude Purposes, and it does the job fine:

End of the story.

Thanks for your help!

Glad you found it - and it was indeed the issue I pointed out in my first reply. In general using a layer-purpose for this is not a very "Open Access" way of doing blockages (there are specific objects for this) - it's more how it was done in CDB. 

Anyway, you have a solution.

Andrew

What do you mean by "there are specific objects for this"?

What is CDB ?

Under Create->P&R Objects->Blockages (hit F3 so you can see the type of blockage and the layers to block). These are in the "objects" part of the layer palette.

The benefit of these special objects is that their meaning is clear, rather than the older way (used in the old database format used in IC5141 and before, which was called "CDB") where everything was a polygon but certain layer-purposes had special meaning to some tools.

Whether your flow supports these, I'm not sure...

Regards,

Andrew.

Ho, I understand.

But our kit at GF does not allow us to use these objects.

Furthermore the founders usually use Calibre and do not care on how the excludes are made in Cadence environment :-)

And to finish the layouters usually do not like using objects as they are not handy (so as for Virtuoso-XL)  :-)