Question

Which of the following bits are used to control the cache behaviour?

(a) cacheable bit

(b) buffer bit

(c) cacheable bit and buffer bit

(d) cacheable bit, buffer bit and permission access bit

The question was posed to me during an interview for a job.

I'd like to ask this question from Memory Protection Unit topic in chapter Memory Systems of Embedded Systems

Answer 1

Correct choice is (c) cacheable bit and buffer bit

To explain: The cacheable bit and the buffer bit are used to control the behaviour of cache. Depending on the cacheable bit and the buffer bit, the memory access will complete successfully.