Most accurate Setup and hold in each corner

[feel_on_on]

Most accurate : setup and hold in each corner:separate calculated
OCV libraries

set_operating_conditions
-analysis_type on_chip_variation
-max_lib WORST_LIB
-max WORST_OC
-min_lib WORST_LIB_OCV_min
-min WORST_OCV_min


Why is it the Most accurate OCV set?

If chip worked at best operation condition,It should use best min library and best max library for timing analyze.If you use two library ,best max library and worst min library for OCV timing analyze, is it accurate?

 

[ayush717]

Hi ..

If I understood correctly, the doubt is that whether best-min-lib + best-max-lib combo would be more accurate or best-max-lib+worst-min-lib combo for timing-analysis in OCV mode for best_case operating condition ??

If this is the case, during On-Chip-Variation mode the clock path and data path are derated in different directions so as to achieve/create a more pessimistic case. So for timing analysis of best_case_operating condition, the motive would be to make the data path faster + clock path slower, consequently, the preferred case would be to pick up worst-min-lib for data path and best-max-lib for clock path.

In conclusion, yes, it would be more accurate to use combination of best-max + worst-min libraries.

Please correct me if you feel contrary ..

Cheers,