Q56 A cache memory unit with capacity of N words and block size of B words is to be designed If it is designed as direct mapped cache the length of the TAG field is 10 bits If the cache unit is now designed as a 16 way set associative cache the length of the TAG field is bits gate computer science 2017

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Q.56) A cache memory unit with capacity of N words and block size of B words is to be designed. If it is designed as direct mapped cache, the length of the TAG field is 10 bits. If the cache unit is now designed as a 16-way set-associative cache, the length of the TAG field is ______ bits. -gate computer science 2017

A) 12
B) 14
C) 16
D) 18

Answers
B) 14

Explanation: 
Type of mapping is direct map; for this direct map, 10 bits are required in itss Tag. 
It is updated to 16 way set Associative map then new tag field size = 10 + log216 = 14 bits, because for k way set associative map design, log2k bits are additionally required to the number of bits in tag field for Direct map design.

This explanation is contributed by Deepak Raj

Answerd By:deepuckraj

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