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MESI protocol

   Also found in: Wikipedia 0.01 sec.
(processor)MESI protocol - Modified, Exclusive, Shared, Invalid.

A cache coherency protocol where each cache line is marked with one of the four states.

The MESI protocol is used by the Pentium processor.
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The five-state MOESI protocol extends the functionality of the standard MESI protocol to permit one processor to access modified data from the other processor's cache.
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To ensure that a read always returns the latest data, the bus implements the standard MESI protocol to maintain complete data and I/O coherence.
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