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The outputs Q and Q̅ of the master-slave SR flip-flop are connected to its R and S inputs respectively. The output Q when clock pulses are applied will be:

The outputs Q and Q̅ of the master-slave SR flip-flop are connected to its R and S inputs respectively. The output Q when clock pulses are applied will be: Correct Answer complementing with every clock pulse 

CHECK

Explanation:

The general structure of master slave SR flipflop is shown below:

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Qm, Q̅m : Output of master flipflop

Qs, Q̅s : Output of slave flip flop

Analysis:

When CLK = 1 the only master is active and the slave is inactive.

When CLK = 0, the slave is active and the master is inactive.

Given that output of the master flipflop Qm Q̅m are connected to R and S respectively, i.e.

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Truth Table of SR flip slop will be:

S R

Q(n + 1)

0 0

Q(n)

0 1

0

1 0

1

1 1

Xx (Indeterminent)


Characteristic table is:

S

R

Q(n)

 Q(n + 1) 

 

0

0

0

1

0

10

Q(n)

0

1

0

1

0

0

Reset

1

0

0

1

1

1

Set

1

1

0

1

X

x

 Indeterminate 


Let the initial value of Q be ‘0’ then Q̅ = 1 

 

Qm

Q = Q̅m

R = Qm

Q(m + 1)

Initial

0

-

-

-

CLK 1

 

s = 1

R = 0

1

CLK 2

1

s = 0

R = 1

0

CLK 3

0

s = 1

R = 0

1

CLK 4

1

s = 0

R = 1

0

CLK 5

0

s = 1

R = 0

1

CLK 6

1

s = 0

R = 1

0


This will be repeated for further operation.

Conclusion:

The output (Qm) when the clock applied will be like 1 → 0 → 1 → 0 → 1 → 0 - - -

Complementing with every clock pulse. 

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