The next state table of a 2 bit saturating up-counter is given below.

The counter is built as synchronous sequential circuit using D flip-flops. The value for D₁ and D₂ are

(A) D₁ = Q₀ + Q₁
D₂ = Q\’₀ + Q₁
(B) D₁ = Q\’₁Q₀
D₂ = Q\’₁ + Q\’₀
(C) D₁ = Q\’₀ + Q₁
D₂ = Q₀ + Q₁
(D) None of these


Answer: (A)

Explanation: Since D = Q, so;

Using above excitation table,
D₁ = Q₀ + Q₁
D₂ = Q\’₀ + Q₁

Option (A) is correct.

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