15.7.17 Locking Quadrant Clock Regions

You can lock and unlock quadrant clock regions only in IGLOO, Fusion, and ProASIC3 devices.

Running the Global Planner automatically deletes all unlocked quadrant clock regions and re-assigns them. To prevent the Global Planner from deleting a quadrant clock region, you must lock it.

To lock a quadrant clock region:

  1. In the Hierarchy window, click the Regions tab.
  2. Select the Qclock region to lock.
  3. Right-click and choose Lock, or from the Region menu, choose Lock.
  4. From the File menu, choose Commit.

To unlock a quadrant clock region:

  1. In the Hierarchy window, click the Regions tab.
  2. Select the region to unlock.
  3. Right-click and choose Unlock, or from the Region menu, choose Unlock.
  4. From the File menu, choose Commit.

You can also lock or unlock a Qclock region in the Find panel select the region, right-click, and choose Lock or Unlock.

Note:
  • When you create quadrant clock regions in MVN, the regions are automatically locked. Running the Global Planner tool will not delete locked quadrant clock regions.
  • When you lock a net driver in a quadrant clock region, running the Global Planner will not unlock nor delete the net driver.
  • When you explicitly lock quadrant clock regions in MVN, running the Global Planner in MVN will not unlock nor delete them.
  • In MVN, when you place the driver of a global net in a quadrant location, MVN automatically creates the quadrant clock region.