has any done this ? Draw the truth table showing the dependency Q (T+1) of Q(t) for the JK flip-flop. Include the logic diagram, and the truth table for the D flipflop, on which the construction of the JK flip-flop depends.
JK Flip Flop Truth Table:
A J,K Flip Flop has 2 input J and K (along with clock) and two outputs Q and Q'. The truth table looks like this:
Clock | J | K | Present State (Q(t) | Next State (Q(t+1)) | ||
Q | Q' | Q | Q' | |||
1 | 0 | 0 | 0 | 1 | 0 | 1 |
1 | 0 | 0 | 1 | 0 | 1 | 0 |
1 | 0 | 1 | 0 | 1 | 0 | 1 |
1 | 0 | 1 | 1 | 0 | 0 | 1 |
1 | 1 | 0 | 0 | 1 | 1 | 0 |
1 | 1 | 0 | 1 | 0 | 1 | 0 |
1 | 1 | 1 | 0 | 1 | 1 | 0 |
1 | 1 | 1 | 1 | 0 | 0 | 1 |
Logic diagram for D flip flop:
It is made up of 4 Nand gates. The output is dependent on the previous state.
The truth table for D flip flop:
Clock | D | Present State (Q(t) | Next State (Q(t+1)) | ||
Q | Q' | Q | Q' | ||
0 | 0 | 0 | 1 | 0 | 1 |
0 | 0 | 1 | 0 | 1 | 0 |
0 | 1 | 0 | 1 | 0 | 1 |
0 | 1 | 1 | 0 | 1 | 0 |
1 | 0 | 0 | 1 | 0 | 1 |
1 | 0 | 1 | 0 | 1 | 0 |
1 | 1 | 0 | 1 | 1 | 0 |
1 | 1 | 1 | 0 | 1 | 0 |
No change occurs when clock is 0 regardless of the value of D.
The change happens only for value of D=1,Clock=1.
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