Basic Global Timing Constraints ( using the FROM-TO Syntax)
TIMESPEC TS_F2F=FROM:FFS:TO:FFS:30;
The word TIMESPEC defines the type of specification
The Spec’s name must start with “TS” any alpha-numeric after TS is fine. Recommendation: Make the name something you will remember later.
FROM: designates the origin of the path
TO: designates the destination of the path
30; in ns by default, is the specification. You can use MHz, or even another time spec like TS_C2S/2 or TS_C2S*2