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How is it routing different from pre-routing ?

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difference in global routing and detailed routing

Hi
what is pre-routing? How is it routing different from pre-routing.
 

Routing and Pre-routing

Global Routing: Initial routing that is done to approximately estimate the delays in the design.

It reduces the Synthesis layout Iteration..

The estimated delay is back annotated to PrimeTime for STA.

Detailed Routing. Actual /complete routing of nets in the design. After this process , the actual delays can be extracted(RC extraction) and annotate to primetime for Postlayout STA..

hope it helps
 

Routing and Pre-routing

Preroute should be anything you route manually (such as power and ground signals) before the actual tools routing.
 

Re: Routing and Pre-routing

according to me... Pre-routing means--- default....routing done by the tool...which may not be based on the constriant based...or area...based... design is not complete....

Routing is--design is complete and have all the ingradients to have routing done....
 

Re: Routing and Pre-routing

Never heard "pre-routing". Are you talking about placement or global routing before the detailed routing?
 

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