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Convert SR flip flop to D flip flop.

Required flip flop : D flip flop

Given flip flop : SR flip flop.

Step 1: Excitation table for S - R flip flop.

$Q_n$ $\rightarrow$ $Q_n + 1$ S R
0 $\rightarrow$ 0 0 X
0 $\rightarrow$ 1 1 0
1 $\rightarrow$ 0 0 1
1 $\rightarrow$ 1 X 0

Step: 2 Preparing characteristic table ff i/ps.

D $Q_n$ $Q_n +1$ S R
0 0 0 0 X
0 1 0 0 1
1 0 1 1 0
1 1 1 X 0

Step 3: Preparing comb-national ckt to drive i/ps 'S' and 'R'

For 's'

For 'R'

Step 4: D - Flip flop using S - R flip flop.

renu • 121  views
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