13.8.7.2.1 Limitations

When you create your block, you cannot assign a port-connected net to a local clock. The routing for local clocks from the blocks cannot always be preserved.

For Axcelerator all local clocks will be rerouted in the <top> design.

For all other families, local clocks are rerouted only if they are used in more than one block. The local clock constraint is preserved and the only difference in the routing is from the driver to the entry point of the clock network (when it gets to the clock network you end up with the same routing since the macros are locked in the same location).