A Finite State Machine (FSM) was designed to build a circuit for a scrolling door sign that displayed 'ALOHA' when an office is open, and 'PAU' when it is closed with custom logic.
| In | Current State | Next State | Output | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DI | D1 | D2 | D3 | D4 | D1 | D2 | D3 | D4 | a | b | c | d | e | f | g | |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | P |
| 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | A |
| 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | U |
| 0 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ‘ ‘ |
| 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ‘ ‘ |
| 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 0 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 0 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 0 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | A |
| 1 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | L |
| 1 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | O |
| 1 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | H |
| 1 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | A |
| 1 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ‘ ‘ |
| 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ‘ ‘ |
| 1 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 1 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 1 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 1 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 1 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | X | X | X | X | X | X | X | X |
| Q1 | Q2 | Q3 | Q4 | Q1 | Q2 | Q3 | Q4 | D1 | D2 | D3 | D4 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 1 |
| 0 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 |
| 0 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 1 | 1 |
| 0 | 0 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 |
| 0 | 1 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 0 | 1 |
| 0 | 1 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 1 | 1 | 0 |
| 0 | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 1 | 1 |
| 0 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 |
| 1 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 0 | 1 |
| 1 | 0 | 0 | 1 | 1 | 0 | 1 | 0 | 1 | 0 | 1 | 0 |
| 1 | 0 | 1 | 0 | 1 | 0 | 1 | 1 | 1 | 0 | 1 | 1 |
| 1 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | 0 | 0 |
| 1 | 1 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | 1 | 0 | 1 |
| 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 0 |
| 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
A behavioral model was implement in SystemVerilog using EDA Playground, and attached as a .sv file.