ISRO | ISRO CS 2013 | Question 54

Consider a logical address space of 8 pages of 1024 words each, mapped onto a physical memory of 32 frames. How many bits are there in the physical address and logical address respectively?

(A)

5, 3

(B)

10, 10

(C)

15, 13

(D)

15, 15

Answer: (C)
Explanation:

Logical address space has 8 pages, size of each page, offset = 1024 words Number of bits in page# field of the logical address = log₂8 bits = 3 bits Offset bits = log₂1024 = 10 bits So, Logical address = 3 + 10 = 13 bits Physical memory has 32 frames, offset = 1024 words Number of bits in frame# field of the Physical address = log₂32 bits = 5 bits Physical address = 5 + 10 = 15 bits Option (C) is correct.

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