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[SOLVED] Can you use StarRC to extract a certain subcell and all its connections to topcell?

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majd229

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Hello, my team is working on RC extraction from layout for certain subcells inside a big layout. We don't want to extract the whole thing because the extracted netlist will be huge and take long.

So they want to extract starting from a subcell of interest, but trace the connections of the nets and pins from that subcell all the way to the topcell and bumps. Is this possible using StarRC? What are key notes or commands to look at it?

Any wisdom appreciated.
 

No, this is not possible - in StarRC, or in any other industry standard parasitic extraction tool.
(actually, the goal as you formulated it is not well-defined - what if your net goes to other cells (at the same or lower hierarchy level)).

What you can do, to speed up your extraction, is to extract (at the top hierarchy level, of course) only the net(s) that you are interested in.
In some extraction tools this is called "selective extraction".
Of course, the LVS/DRC should process the whole design (otherwise, how can net connectivity be extracted?), to prepare the proper input data for extraction tool (CCI database, LVS database, etc.), and this now may become your overall extraction time bottleneck.

There is an alternative technique, less accurate one (but potentially much faster), is to use what's called "hierarchical extraction", i.e. to black-box (or to grey-box) the cells that you are not interested in.

Max
 

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