GATE EE 2015 Set 1 — Question 47

NAT+2 / -0MediumLatches, Flip-Flops & CountersDigital Logic CircuitsAnalog & Digital Electronics

Analog & Digital Electronics → Digital Logic Circuits → Latches, Flip-Flops & Counters

Last updated 5 September 2026

Question

Q_2Q_1Q_0=000

J_0 = K_0 = 1

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J_0 = K_0 = 1

CLK pulse	$Q_0$ edge	Action on FF1 ( $J_1=\bar{Q}_2$ )	Action on FF2 ( $J_2=Q_1$ )	$Q_2Q_1Q_0$
1	$0 \to 1$ (rising)	none	none	001
2	$1 \to 0$ (falling)	$J_1=1$ : toggle $Q_1$ to 1	$J_2=Q_1=0$ : reset, stays 0	010
3	$0 \to 1$	none	none	011
4	$1 \to 0$	$J_1=1$ : toggle $Q_1$ to 0	$J_2=Q_1=1$ : toggle $Q_2$ to 1	100
5	$0 \to 1$	none	none	101
6	$1 \to 0$	$J_1=\bar{Q}_2=0$ : reset, $Q_1$ stays 0	$J_2=Q_1=0$ : reset $Q_2$ to 0	000

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