Basic Global Timing Constraints ( using the FROM-TO Syntax)
UCF TIMESPEC command using default keywords:
TIMESPEC TS_C2S=FROM:FFS:TO:FFS:30;
TIMESPEC TS_P2S=FROM:PADS:TO:FFS:25;
TIMESPEC TS_P2P=FROM:PADS:TO:PADS:26;
TIMESPEC TS_C2P=FROM:FFS:TO:PADS:9;