Question

A control bit called _________ has to be provided to each block in set-associative.

(a) Idol bit

(b) Valid bit

(c) Reference bit

(d) All of the mentioned

The question was asked in unit test.

I would like to ask this question from Mapping Functions in portion Memory System of Computer Architecture

Answer 1

Correct choice is (b) Valid bit

For explanation I would say: The valid bit is used to indicate that the block holds valid information.