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The RN-Fs in the CCN-502 that support Distributed Virtual Memory (DVM) messages can send DVM requests and receive DVM snoops. In addition, RN-Is that include a System Memory Management Unit (SMMU) and connect to an RN-I bridge that supports DVMs, can receive DVM snoops.
A DVM message from an RN-F is sent to the MN and then the MN forwards it as a snoop to the participating RNs. The MN is also responsible for collecting the individual snoop responses and sending a single response back to the RN-F, that originated the DVM message transaction. The DVM Domain Control register in the MN includes the list of RNs that are destinations for DVM snoops.
For more information about DVM messages, see the ARM® AMBA® 5 CHI Architecture Specification.