9.9.2 Adding a Timing Exception Constraint from a Timing Path

To add a timing exception constraint from a timing path in SmartTime Max/Min Delay Analysis View:

  1. Open SmartTime (Design Flow Window > Verify Timing > Open interactively).
  2. Open the Constraints Editor (Constraint Manager > Timing Tab > Edit with Constraints Editor).
  3. Select Max/Min Delay Analysis View, and then right-click a timing path in the table.
  4. Select a timing exception constraint to add:
    • False Path Constraint
    • Maximum Delay Constraint
    • Minimum Delay Constraint
    • Multicycle Path Constraint
    Figure 9-2. Add Timing Constraint from SmartTime’s Reported Timing Path
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    Note: If the Constraint Editor is not open, the Add Max/Min Delay, False Path, and Multicycle Path Constraint menu items are grayed out.
  5. Add the Constraint in the Add Constraint dialog box. The source/from pin and destination/to pin fields are populated with the appropriate pin names captured from the SmartTime reported path (Source Pin and Sink Pin) you clicked.
    1. Click OK to exit the Add Constraint dialog box.
    2. Click Save in the Constraints Editor.
    3. Exit the Constraints Editor.
    4. Exit SmartTime.
    5. If the newly added constraint that is added to a file (the Target file) is used for Place and Route and Verify Timing, rerun Place and Route.
    6. Open SmartTime Maximum/Minimum Delay Analysis View.
    Figure 9-3. Add Maximum Delay Constraint
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