Multiple choice

Consider the following circuit.

Flip Flop

The flip-flops are positive edge triggered D FFs. Each state is designated as a two bit string Q0Q1. Let the initial state be 00. The state transition sequence is:

  1. Option

  2. be

  3. c

  4. d
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Q0 will toggle in every cycle because Q0‘ (Q0 complement) is fed as input to the D0 flip flop. For the D1 flip flop, D1 = Q0 ⊕ Q1‘ , i.e., Q0 XOR Q1‘. So, the bit pattern Q0 Q1 will be :

Q0 Q1 0     0 1     1 0     1 1     0 0     0 .        . .        . .        . Thus, the transition sequence will be d

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