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How do I get an instances - List from a database ID of an instance?

Hey, I'm new to SKILL.

For traversing the hierarchy in my schematic I wanted to write a recursive program.
My problem is, that I have the CellViewID of my top-cell, but I dont know how to descend into lower hierarchies just using the database IDs.

Of course I dont want to open every Instance in my window, that would be very inefficient.

cv = geGetWindowCellView(hiGetCurrentWindow())

first_instance = car( cv ~> instances )

Lets say, that I saved the first Instance-DatabaseID in my variable "first_instance". How do I get to the instances in the next lower hierarchy?

Thanks for your help!

Andrew Beckett over 2 years ago
There are a few approaches for doing this. First of all a couple of discussions before (there are many more on the forums):

https://community.cadence.com/cadence_technology_forums/f/custom-ic-skill/17718/how-to-traverse-the-hierarchy-in-a-schematic/1353372#1353372

https://community.cadence.com/cadence_technology_forums/f/custom-ic-skill/46694/list-all-sub-cells-without-opening-it-schematic-layout/1369215#1369215

and there are quite a few articles on http://support.cadence.com

The first thing to decide is whether you need to visit every instance, or every master. By that I mean, do you repeatedly want to visit each sub-cell for each repeated instance or is visiting it just once enough?

If you're doing it for every instance, the pseudo code is:

procedure(VisitAllInstance(cv @optional (viewList "schematic symbol") (hierPath ""))
let((newMaster)
foreach(inst cv~>instances
; could check inst~>pin to omit pins if you wanted
printf("Inst %s%s of cell %s\n" hierPath inst~>name inst~>cellName)
newMaster=dbGetAnyInstSwitchMaster(inst viewList)
when(newMaster
VisitAllInstance(newMaster viewList strcat(hierPath inst~>name "/"))
)
)
t
)
)

If you don't need to visit every instance, you could traverse the instMasters or instHeaders so you only get each type of component once. Another example can be found in this article: 11300048

Andrew
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Socks and Shoes over 2 years ago in reply to Andrew Beckett

That helped a lot! Thank you Andrew!
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