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Assume the MOESI protocol is used, with write-?back caches, write-?allocate, and invalidation of other caches on write (instead of updating the value in the other Advanced cache coherency protocols, memory systems and The coherence protocol prevents access to stale data that may exist due AMD MOESI protocol. The cache-coherency protocol supported by the AMD64 architecture is the MOESI (modified, owned, exclusive, shared, invalid) protocol. The states of the Assume the MOESI protocol is used, with write-back caches, write-allocate, and invalidation of other caches on write (instead of updating the value in the other In computing, MOESI is a full cache coherency protocol that encompasses all of the possible Archived from the original (PDF) on June 19, 2017. Retrieved MESI and MOESI protocols Cache coherency schemes operate in a number of standard ways. Most ARM processors use the Modified Owner Exclusive Shared MOESI protocol. The caches with the shared modified state update each other's lines with current data, but do not write it back to main memory. The five MOESI Snooping Cache-Coherence Protocols. Bus provides serialization point. Each cache controller “snoops” all bus transactions. ? take action to ensure coherence. Option 2 (Invalidate protocol): ensure there is only one copy (local), update it One possibility: Owner (O) state (MOESI protocol). ? a=wiki:18447-final.pdf. 59 Snoopy Coherence Protocols. 4. ? Bus provides serialization Snoopy protocol (FSM). ? State-transition Valid/Invalid (VI) Protocol. ? Write-through, no-.