what is congestion driven?

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What is Congestion Driven ?
what happens When we perform congestion Driven?
What is meant by high effort congestion driven?what happens there?

Thanks........
 

Congestion driven, means the placement is driven to facilitate the routing.
 

Beside the congestion driven, the other one is timing driven.

The first one you have to know is that the there is no golden rule for routing.
Sometimes we want the performance as good as possible <== timing driven
But sometime we just want that routing is successful <== congestion driven

Generally, the performance of circuit with timing driven is better.
In this case, it's better that the standard cells are placed together which may causes routing fail.
Once the routing fail, the circuit doesn't work at all and hence no performance.
So we have to make trade off between timing driven and congestion driven.
 

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