coherence between R82 and other cpu or hardware modules

Hi,

There are two questions about coherence between R82 and others  as:

 R82 only with a ACE5-LITE interface

1. If R82 works with other 4 independent cpus  with caches in a system to visit sharable memory, could you tell me how to do to maintain the coherence among them?

1. If R82 works with other 4 hardware modules  without caches in a system to visit sharable memory, could you tell me how to do to maintain the coherence among them?