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16kB cache with line size 64B uses 4-way set associative mapping. Main memory is 8 MB and byte addressable.The size of extra space needed for storing tag information in bytes is _________

 Is ans is 452

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Cache size  16KB

Block size 64B

Number of block on cache 16 KB/64B=256 block

Number of sets 64

Main memory generate address of 23 bit (8 MB)

Address format

Tag| set| block

Set = 6 bit , block = 6 bit

Tag = 23-6-6=11 bit

Extra space for tag information is 2bytes approximate

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