|Non-Confidential||PDF version||ARM 100052_0001_00_en|
|Home > Functional Description > Exclusive accesses > HN-F exclusive accesses|
The HN-F supports exclusive access on ReadNoSnp, WriteNoSnp, ReadShared, ReadClean, and CleanUnique transactions to any address that maps to the HN-F.
The RN-F generates:
Each HN-F partition includes 32 exclusive monitors for tracking these transaction types, and each monitor can operate as both a PoC monitor and System monitor, as defined by the CHI architecture.
For each of the 2 (6XP/2HNF) or 4 (8XP/4HNF) HN-F partitions, only 32 unique logical threads, either processor or device threads, designated by a unique SrcID or LPID, can access the exclusive monitors of that HN-F during one instance of the CCN-502 operation, from reset deassertion to reset assertion. This is because these monitors are permanently assigned to a logical thread on the first exclusive access by that thread, and are not then available to any other thread.