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Why timing is varied for designs in place & route tool i

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designer_ec

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Timing inPT

Hi,

Why timing is varied for designs in place & route tool and sign of STA tools (PT).Please explain here detailly.
 

Timing inPT

The key point is: The algorithm the two tools used to calculate the delay is different.
1: The RC value.
2: The CPPR effect.
...
 

Re: Timing inPT

In STA say in PT we use Back-annotated SDF where in in P & R Tool we extract the SDF once detail route is completed. So.. analysing the RC Delay and process variation effects are more accurate in PT as compared to Astro or Blast Fusion etc.. Hope this helps.....
 

Re: Timing inPT

To be simple - STA uses timing models for the design, while after P&R it is the original.
 

Re: Timing inPT

Thanks all,here again I have doubts.

1.What is timing model and what is original.Why P&R tool not using timing models? If we use timing models in P&R tools,then we need not do sign-off ? am I right.

2.We are using same libraries,then how can we say RC delay values and process variation effects more accurate in PT as we compare to P&R tool and why?
 

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