Sahithyan's S2 — Computer Organization and Digital Design
SR Flip-flop
Has 2 inputs:
| S | R | Q | Q’ | Description |
|---|---|---|---|---|
| 0 | 0 | No Change | No Change | Holds the previous state |
| 0 | 1 | 0 | 1 | Resets the output to 0 |
| 1 | 0 | 1 | 0 | Sets the output to 1 |
| 1 | 1 | Undefined | Undefined | Invalid state |
Characteristics
Excitation table
| Current State (Q) | Next State (Q+) | S | R |
|---|---|---|---|
| 0 | 0 | 0 | X |
| 0 | 1 | 1 | 0 |
| 1 | 0 | 0 | 1 |
| 1 | 1 | X | 0 |