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How many possibilities of mapping does a direct mapped cache have?

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How many possibilities of mapping does a direct mapped cache have?

(a) 1

(b) 2

(c) 3

(d) 4

This question was addressed to me by my school principal while I was bunking the class.

Question is from Cache Memory topic in division Memory Systems of Embedded Systems

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Right choice is (a) 1

The explanation is: The direct mapped cache only have one possibility to fetch data whereas a two-way system, there are two possibilities, for a three-way system, there are three possibilities and so on. It is also known as the one-way set associative cache.

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