regarding typical timing analysys

[venkatramanan]

we are closing timing in best case and worst case...then why we goin for typical corner..?

 

[rca]

Could be used to check the maximum freq, and match it with you silicium?
Also to report more realistic power consumption.

 

[Prashanthanilm]

we are closing timing in best case and worst case...then why we goin for typical corner..?

As Venkataram said, TT is used to get the Frequency range, operation conditions . FF and SS just are the borders of operation.