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I don't think so..it's related to any technical term...
its just which you qualified the STA tool..from available tools...if you can post the source of information than it would be greater to understand...
STA tools need to Qualify to signoff the timing to proceed for Fab.
Prime Time is universally accepted by the industry, which is around 80% of the designs tape out with this. Next signoff tool is ETS.
You can qualify the STA results wrto Spice results. If the variation is more than 5%, the tool cant recommended for STA signoff.
In PT, the correlation will be any where between 2-4%.
Other way to qualify , the inbuilt algorithms used inside the tool for timing analysis.
One more is, the QOR(timing) need to match with Implementation tools like EDI,ICC,Magma. If variation is more than 5%, timing convergence for signoff is difficult..
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