A detailed FSM design example

• Digital combination lock:

  • Punch in 3 values in sequence and the door opens
  • If there is an error the lock must be reset
  • After the door opens the lock must be reset
  • Inputs: sequence of number values, reset
  • Outputs: door open/close
  • Memory: Must remember the combination
  • Question: How do you load a combination?
    • Stored in registers?
    • Hardwired?

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