GATE | GATE-IT-2004 | Question 66

In a virtual memory system, size of virtual address is 32-bit, size of physical address is 30-bit, page size is 4 Kbyte and size of each page table entry is 32-bit. The main memory is byte addressable. Which one of the following is the maximum number of bits that can be used for storing protection and other information in each page table entry?
(A) 2
(B) 10
(C) 12
(D) 14


Answer: (D)

Explanation:
Virtual memory = 232 bytes
Physical memory = 230 bytes

Page size = Frame size = 4 * 103 bytes = 22 * 210 bytes = 212 bytes

Number of frames = Physical memory / Frame size = 230/212 = 218

Therefore, Numbers of bits for frame = 18 bits

Page Table Entry Size = Number of bits for frame + Other information
Other information = 32 – 18 = 14 bits

 
Thus, option (D) is correct.

 
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