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CACHE MAPPING

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What is the no.of multiplexer user in Set Associative Cache Mapping ? After CPU generates the Address ,1st Set bits are checked(Are these set bits ,extra space than the tags that is attached to every lines of cache?)

As far i have understood that After Cpu generates the address 1st set-bits are matched with cache set-bits. Multiplexer equal to no of bits in SET are used for selectting in which set address could be.THen the k tags of k set associative are send to comaparator where it is matched to the tag of address generated by CPU.
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