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sdf generated by Astro and PT,any difference?

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starmx

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post-sim needs a sdf file,it can be generated by Astro,
or spef-> Primetime->sdf

so here's the problem,what's the difference between them?

3X
 

Typically there should be no differences except few syntax.

But people generally use PT generated as it accounts SI effects.
 

Before physical design the sdf file generated by PT will include the interconnect dellays (which are modelled) for the timing verification

spef file generated by Astro will contain the exact delay information about the delay
 

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