Congestion analysis in IC Compiler

[Simranjeet Singh]

In IC Compiler, there are three congestion maps namely: Placement congestion, Global Route congestion and Detail Route congestion.

Whats the difference between them ?

Thanks

 

[matter]

Global route congestion is used in the pre-route stages.
Detailed route congestion is used in the post route stages.
By placement congestion, we generally refer to the GR congestion after place_opt.
Aside from routing congestion, I also look at cell density for hot spots. I am not sure if you are referring this cell density as placement congestion