258 State machine of an impulse counter
258 : State machine of an impulse counter
- Author: Adrian Novosel
- Description: This design is not meant to be a standalone circuit. It is a state machine of my bachelor's thesis project which was also submitted to Tiny Tapeout. This submittal will be used for debugging and will give a better insight into the working principle of its source design. (https://github.com/DinkoOletic/tt04-wokwi_unizgfer_multich_pulse_counter_v01a)
- GitHub repository
- Open in 3D viewer
- View in Wokwi
- Clock: 0 Hz
How it works
By clocking the state machine adress pins a2, a1 and a0 change their values every 12 clocks. Shift/load pin is set to 1 and then back to zero every 12 clocks. Other outputs are used for debugging.
How to test
After an impulse on reset pin and a subsequent impulse on the ovf pin, you can start clocking the circuit. Adress pins marked with "a" should follow the sequence: "100"->"000"->"001"->"010"->"011"->"000". Shift/load pin wil be set to 1 after every adress change and then set back to 0 on the next clock. The sequence will repeat itself.
IO
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | reset | counter flop1 | a2 |
| 1 | ovf | counter flop2 | a1 |
| 2 | clk | counter flop3 | a0 |
| 3 | bi oe | counter flop4 | shift/load |
| 4 | zero | sm flop1 | |
| 5 | one | sm flop 2 | |
| 6 | global reset | sm flop 3 | |
| 7 | ovf | sm flop 4 |