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[Solved]: Why we need to read memory on a write-miss?

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Problem Detail: 

I noticed that in write-back cache memories, when cpu want to write on a block, it should fetch it from memory then update that block. so if block is going to be overwritten and changed by processor, so why we should read that block from memory?

Asked By : VSB

Answered By : VSB

Because write-miss happens only with just a word missing in a block. So all of the block which contains that word must be fetched and then that special word must be updated.

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