Question
Consider a 4-way set associative cache consisting of
128 lines with a line size of 64 words. The CPU generates a 20-bit address of a word in main memory. The number of bits in the TAG, LINE and WORD fields are respectively:Solution
The number of sets = 128/4 = 32 (as it is 4 way set associative) We have total 64 words then we need 6 bits to identify the word So the line offset is 5 bits and the word offset is 6 bits and the TAG = 20-(5+6) =9 bits so it should be 9,5,6 Â
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