CSC270 Lab 5 2016

--D. Thiebaut (talk) 18:12, 24 February 2016 (EST)

---

This lab presents Finite State Machines (FSM) and will you have explore a couple Moore machines.

Finite State Machine

Word problem

Implement a sequencer (FSM) which controls 3 lights: a green light, a yellow light, and a red light. The lights operate in a cycle, as follows:

1. Green is ON for 1 second, and turns OFF. Then
2. Yellow is ON for 1 second, then turns OFF. Then
3. Red is ON for 2 seconds, and stays ON. Then
4. Yellow turns ON for 1 second, and after that both Red and Yellow turn OFF.

Part 1

• Generate the timing diagram, and the state diagram.
• Find the number of flip-flops required to implement the FSM.
• Find the boolean functions that will generate the D inputs to the flip-flops, and the R, G, and Y outputs.

Part 2

• Verify that your design is correct by coding your equations in a Python simulator.

Part 3

• Wire up a circuit that implements this FSM. Demonstrate its correct behavior to your instructor.

Minimal and Controllable Moore FSM

• This part is optional, and has to be done only if you have time.
• Implement this FMS shown below and observe its behavior. The Cmd signal should be connected to a switch. The Q output should be connected to an LED. The flip-flop shown is half of a 74LS74 integrated circuit.
• Generate the sequencer's timing diagram from your observation of its behavior.
• Generate the state diagram of the sequencer.