15.7.15 Creating Quadrant Clock Regions

You can create QuadrantClock regions only for IGLOO, Fusion, and ProASIC3 devices.

To create a QuadrantClock region:

1. In the Net tab of the Hierarchy window, select a clock net. Clock nets have a clock icon next to them in the Net view.
2. From the Region menu, choose Create QuadrantClock,or click its icon in the toolbar. "Select a point in the Chip..." appears in the status bar.
3. Select a point in the chip that is driven by QCLK. ChipPlanner creates a QuadrantClock region for the given net. The region name is Qclock_<netname> and appears in the Regions tab of the Hierarchy window. A tickmark appears next to the net in the Net tab and next to all the macros driven by it.

Under the following conditions, ChipPlanner does not create a QuadrantClock region and displays an error message in the Log window:

• A net is not selected or more than one net is selected.
• The selected net is already assigned to a QuadrantClock region.
• Any macros connected to the selected net are locked outside of the region.
• Any macros connected to the selected net are assigned to a region that does not overlap the QuadrantClock region.
• The macros connected to the net exceed the capacity of the quadrant clock.