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