Question

How many bits does the memory region in the ARM memory protection unit have?

(a) 1

(b) 2

(c) 3

(d) 4

This question was addressed to me in an online interview.

I need to ask this question from Memory Protection Unit topic in chapter Memory Systems of Embedded Systems

Answer 1

The correct answer is (c) 3

The best I can explain: The memory region possesses three bits which are the cacheable bit, bufferable bit and access permission bit.