Flip-flop Conversion – D flip-flop to SR flip-flop
Here you would see how to design SR flip-flop using D flip-flop step by step – Flip-flop Conversion: D flip-flop to SR flip-flop
Flip-flop Conversion – D flip-flop to SR flip-flop
Step 1: Write the truth table of the required flip-flop
Here the required flip-flop is SR flip-flop
Hence you need to write the truth table of SR flip-flop which is
|
S |
R |
QN |
QN+1 |
|
0 |
0 |
0 |
0 |
|
0 |
0 |
1 |
1 |
|
0 |
1 |
0 |
0 |
|
0 |
1 |
1 |
0 |
|
1 |
0 |
0 |
1 |
|
1 |
0 |
1 |
1 |
|
1 |
1 |
0 |
X |
|
1 |
1 |
1 |
X |
Step 2: Write the excitation table of the given flip-flop
In this case the given flip-flop is D flip-flop
Therefore you need to write the excitation table of D flip-flop which is
|
QN |
QN+1 |
D |
|
0 |
0 |
0 |
|
0 |
1 |
1 |
|
1 |
0 |
0 |
|
1 |
1 |
1 |
Step 3: Write the conversion table
The conversion table, which is a combination of truth table and excitation table, to implement a SR flip-flop using D flip-flop is as follows
|
S |
R |
QN |
QN+1 |
D |
|
0 |
0 |
0 |
0 |
0 |
|
0 |
0 |
1 |
1 |
1 |
|
0 |
1 |
0 |
0 |
0 |
|
0 |
1 |
1 |
0 |
0 |
|
1 |
0 |
0 |
1 |
1 |
|
1 |
0 |
1 |
1 |
1 |
|
1 |
1 |
0 |
X |
X |
|
1 |
1 |
1 |
X |
X |
Step 4: Find the Boolean expressions for the inputs of the given flip-flop
In this case the given flip-flop is D flip-flop.
Therefore, write the Boolean expressions for D from the conversion table using K-Map.
K-Map for D:
Expression for D would be
D = S + R/QN
Step 5: Draw the circuit for implementing SR flip-flop from D flip-flop
For this, connect the D input of the D flip-flop to the circuit of the Boolean expression for D.
Therefore, the circuit would be:
In this way a SR flip-flop can be realized using a D flip-flop. Hope this post on “Flip-flop Conversion – D flip-flop to SR flip-flop” would help in clearing many doubts in flip-flop conversions.
Related Links:
- Flip-flop Conversion – SR flip-flop to JK flip-flop
- Flip-flop Conversion – SR flip-flop to D flip-flop
- Flip-flop Conversion – JK flip-flop to D flip-flop
- Flip-flop Conversion – JK flip-flop to SR flip-flop
- Flip-flop Conversion – JK flip-flop to T flip-flop
- Flip-flop Conversion – T flip-flop to D flip-flop
- Flip-flop Conversion – T flip-flop to SR flip-flop
- Flip flop Conversion – D flip-flop to T flip-flop
- Flip flop Conversion – SR flip-flop to T flip-flop
- Flip flop Conversion – T flip-flop to JK flip-flop
- Flip flop Conversion – D flip-flop to JK flip-flop
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