Why is my CLOCK_REGION assignment ignored when applied to specific entities in my design? - Why is my CLOCK_REGION assignment ignored when applied to specific entities in my design? Description The CLOCK_REGION assignment must be associated to a specific clock signal. For example: set_instance_assignment -name CLOCK_REGION "REGIONAL CLOCK REGION 0" -to <clock> Resolution If you wish to make a CLOCK_REGION assignment to a specific level of hierarchy in your design then you need to specify both the clock and the entity: set_instance_assignment -name CLOCK_REGION "REGIONAL CLOCK REGION 0" -from <clock> -to <entity> If you don\'t specify the clock as shown in the example below then the assignment may be ignored: set_instance_assignment -name CLOCK_REGION "REGIONAL CLOCK REGION 0" -to <entity> Support for entity only assignments will be evaluated for a future release of the Quartus® II software. Custom Fields values: ['novalue'] Troubleshooting novalue False ['Basic Functions Clocks (Primary)'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']