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Which protocol does MPC601 use?

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Which protocol does MPC601 use?

(a) MESI protocol

(b) MEI protocol

(c) MOSI protocol

(d) MESIF protocol

I got this question in semester exam.

I need to ask this question from Writing Scheme of Cache Memory in chapter Memory Systems of Embedded Systems

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The correct option is (a) MESI protocol

To explain I would say: MPC601 uses a MESI protocol, that is they have a shared state for data accessing in the cache. It can reduce the cache coherency but the cache coherency is processor specific. So different processors have different cache coherency implementations.

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