When you use the update_timing command, PrimeTime SI detects timing violations resulting from theeffects of crosstalk on transitions occurring on victim nets. The slowdown or speedup of a transition cantrigger a setup or hold timing violation. When you use the update noise command, PrimeTime SI detectsfunctional errors resulting from the effects of crosstalk on steady-state nets. A large noise bump on a steady-state net can cause an incorrect logic value to be propagated.
In addition to crosstalk timing errors and steady-state functional errors, PrimeTime SI can also detectfunctional errors resulting from crosstalk effects on switching victim net. These types of errors are calleddouble-switching errors.