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What does instances trees mean?

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coshy

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Hi.
Now I'm viewing the iccrug.pdf which is ICCR USER GUIDE document for coverage.

when I searching the unsupported functionality title, I ran across the "Do not score code in protected modules or instances trees."

I can't understand the meaning of instances trees. can you let me know exactly what does it mean?

Also what If I've got instances trees, then what should I do when I run across this?
 

I will try to guess something here but I am not sure.

Let's say you have a top level A that instantiates modules B1 and B2. B1 and B2 are instances of the same RTL module. The tool will not score coverage for B1 and for B2, it will score coverage on a unique module basis.
 

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