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Each HN-F can send two types of snoop.
The snoop requests are:
The snoop domain vectors for all the RN-Fs are maintained at each HN‑F using the Snoop Domain Control register. Each HN‑F has a copy of this register. It defines which RN‑F clusters are active for coherency actions or snoops. Software must ensure that the appropriate bit vector is set or cleared for RN‑F entry to and exit from the snoop domain, to enable coherent transactions or power down the RN‑Fs.