GATE | GATE CS 2011 | Question 15

The minimum number of D flip-flops needed to design a mod-258 counter is.
(A) 9
(B) 8
(C) 512
(D) 258

Answer: (A)


An n-bit binary counter consists of n flip-flops and can count in binary from 0 to 2^n – 1.  (Source: Computer System Architecture by Morris Mano

2^n ≥ 258

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