Question

Why the page size is in powers of 2?

Answer 1

Because each bit position represents a power of 2, splitting an address between bits results in a page size that is a power of 2.

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Answer 2

It is most efficient to break the address into X page bits and Y offset bits, rather than perform arithmetic on the address to calculate the page number and offset. Because each bit position represents a power of 2, splitting an address between bits results in a page size that is a power of 2.