61. Implement D Latch
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Excitation Tables: An excitation table specifies the minimum inputs required to change a sequential circuit from the present state (Q_n) to the desired next state (Q_n+1). Unlike a truth table, it determines the inputs needed for a given state transition.
JK Flip-Flop Excitation Table: The required J and K inputs for each state transition are defined by the JK excitation table.
| Q_n | Q_n+1 | J | K |
|---|---|---|---|
| 0 | 0 | 0 | X |
| 0 | 1 | 1 | X |
| 1 | 0 | X | 1 |
| 1 | 1 | X | 0 |
Converting JK to D Flip-Flop: A D flip-flop follows Q = D.
- D = 0: Set J = 0 and K = 1 to force the next state to 0.
- D = 1: Set J = 1 and K = 0 to force the next state to 1.
Hardware Implementation: Connect J directly to D and K to D′ using a NOT gate. This removes the JK flip-flop's Hold and Toggle modes, making it operate as a single-input D flip-flop when EN is active.