Question 6520 – NIELIT Scientist -B CS (22-07-17)
December 8, 2023Question 6074 – CHENNAI MATHEMATICAL INSTITUTE (M.Sc. / Ph.D. Programme in Computer Science)15 May 2013
December 8, 2023Question 9234 – Computer-Organization
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:
Correct Answer: D
Question 57 Explanation:
Cache has 128 lines.
Each line size 64 words, so no. of bits for WORD = 6 bits
Because it is 4-way set associative cache, no. of sets in the cache = 128/4 = 32 = 25
No. of bits for the set number = 5
Because the address is 20-bits long, no. of TAG bits = 20-5-6 = 9
Each line size 64 words, so no. of bits for WORD = 6 bits
Because it is 4-way set associative cache, no. of sets in the cache = 128/4 = 32 = 25
No. of bits for the set number = 5
Because the address is 20-bits long, no. of TAG bits = 20-5-6 = 9
9, 6, 5
7, 7, 6
7, 5, 8
9, 5, 6
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