Multiple choice

Consider the partial implementation of a 2 - bit counter using T flip flops following the sequence 0 - 2- 3 - 1 - 0, as shown below:

To complete the circuit, input X should be

  1. Q2`

  2. Q2 + Q1
  3. (Q1 $\oplus$Q2)`
  4. Q1 $\oplus$Q2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 From circuit we see T1=XQ1’+X’Q1—-(1) AND T2=(Q2 ⊕ Q1)’—-(2) AND DESIRED OUTPUT IS 00->10->11->01->00 SO X SHOULD BE Q1Q2’+Q1’Q2 SATISFYING 1 AND 2. SO ANS IS (4).

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