Question

Observe the sequential circuit in Fig. 1. Which of the following is a possible correct waveform of the output? All used J-K flip-flops are positive edge triggered

Observe the sequential circuit in Fig. 1. Which of the following is a possible correct waveform of the output? All used J-K flip-flops are positive edge triggered. Preset Output HIGH Jo QO J1 01 HIGH K1 01 Fig. 1 - -- - - - - - - - w1 1 2 3 1 2 1 2 3 :ܫ ܐ:zXܘܐ:Yܐܘ wz 10 WWW www w3 0 1 3 wa 1 / 3 Von 10 13 3 O None W2 W4 W1

Answer 1

* Given sequential circuit has two Jik flip flops with inputs JD, KO, JI,ki and outputs 20.01 · Orespectively where MSB is al and (SB SB QO. * Boolean expression for flipflop inputs des svied from Sequential circuit as below JO = HIGH =1 JI = QO. KIE HIGH = || * The ciraut output zaken as two bit (6,90) and flip flops have preset input . upon preset, Output of flip flop so zero (o) as considered. | Preset = 1 Output of flip flop Q=0 * The flip flops are triggered on posithe edge of clock, * Truth table of J-k flip flop к ф+ o O' R CHold) 0 0 (Reset) . . 21 . (set). . . . 1 An Ccomplement) * The flipflop outputs (and forms present states of Bequential Circuit: As two states bits. , maxinum : possible States are 9.2. - 00.01,10,117 u rrext states I next outputs derived using Truth table of JK flipflop and Boolean expressions as

prosent states Decimal Q, % (0) 0 0 (0) 0 1 (3) Inputs of flipflop Next states J, KI JO KO. Qit fot 0 1 1 0 0 1 1 1 0 1 Ill. 00 1. Circuit have output sequence 0,1,3 and repeat but 2 is not present in state sequence of gaven sequential araut Timing waveffens preset. Quoio fio boli :.000 t o (9142 Decimal), como OXIX3XXXX 3 The circut output similar to wa waveform Poinset 50 Ti correct Chtion is @ w3