“FROM-TO” Constraints (1)
The two paths could be constrained with two commands:
TIMESPEC TS01 = FROM PADS(Y) TO PADS(OUT1)21;
TIMESPEC TS02 = FROM PADS(Z) TO PADS(OUT2)28;
“FROM:TO” Constraints can start and stop at Flip-Flops, LATCHES, PADS, or RAMS
Examples:
- Constrain all inputs to all Flip-Flops in block NEWFIE: TIMESPEC TS03 = FROM PADS TO FFS(NEWFIE)18ns;
- Constrain all Flip-Flop to Flip-Flop paths in the design:
TIMESPEC TS04 = FROM FFS TO FFS 15ns;
- Constrain all Flip-Flop to output paths in the design:
TIMESPEC TS05 = FROM FFS TO PADS 25ns;