Creating Groups with TNM

• The TNM constraint creates a group of individual components

• Example: create divide Flip-Flops into two groups based on

instance name

INST SLOWFF* TNM = SLO;

INST FASTFF* TNM = FST;

• TIMESPECS are assigned to the new groups:

TIMESPEC TS14 = FROM FFS TO SLO 40 NS;

TIMESPEC TS15 = FROM FFS TO FST 20 NS;

• Greater flexibility in routing is achieved by creating a different timing requirement for these two groups of Flip-Flops

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