Constraining Between Rising & Falling Clock Edges
- Define clock groups, the (“*”) covers all FFS in your design
- TIMEGRP RFFS = RISING FFS (“*”);
- TIMEGRP FFFS = FALLING FFS (“*”);
- Define timing constraints
- TIMESPEC TS_R2F=FROM:RFFS:TO:FFFS:30;
- TIMESPEC TS_F2R=FROM:FFFS:TO:RFFS:30;
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- Remember, the PERIOD constraint will automatically account for two-phase clocks.