13.8.7.2 Local Clock

You can use local clocks in your component to save on globals, but you may need to do some floorplanning in your <top> project.

For example, if you are using an Axcelerator device: if you have one local clock in the Designer Block of type RCLK and four RCLK macros in the <top> project, the Prelayout checker fails. You must floorplan the project to restrict the load placement of one of the clocks in the <top> project.