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.