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In which writing scheme does the cache is updated but the main memory is not updated?(a) write-through(b) write-back(c) no caching of writing cycle(d) write bufferingThe question was posed to me during an interview.My question is based upon Writing Scheme of Cache Memory topic in portion Memory Systems of Embedded Systems

Answer»

Correct answer is (b) write-back

For explanation: The cache write-back mechanism needs a BUS SNOOPING SYSTEM for the coherency. In this write-back scheme, the cache is UPDATED first and the main memory is not updated.



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