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Why Tag Bits is equals to Block Bits in Associative Mapping ?

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What does Tag Bits represent? Tag Bits represent no. of bits required to represent "Total no. of Blocks a line can hold". Since, in Associative Mapping any Block can go to any Line (Many to Many function), therefore, we have $2^{no. of Blocks in Main Memory}$  possible mapping for each Line, implies  Tag Bits = Block No. Bits.

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