Difference between revisions of "CSC270 Exercises on FSM"

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(Exercise #5)
Line 65: Line 65:
  
 
<code><pre>
 
<code><pre>
 +
# flipflop.py
 
# implements a simple sequencer
 
# implements a simple sequencer
 
#  
 
#  
 +
 +
def xor( a, b ):
 +
    if ( a==b ):
 +
        return 0
 +
    return 1
  
 
def main():
 
def main():
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         D0 = 1 - Q0
 
         D0 = 1 - Q0
         D1 = Q0 ^ Q1
+
         D1 = xor( Q0, Q1 )
         D2 = Q1 ^ Q2
+
         D2 = xor( Q1, Q2 )
 
          
 
          
  

Revision as of 17:42, 28 February 2011

--D. Thiebaut 15:24, 28 February 2011 (EST)


Exercise #1

  • Implement a sequencer (FSM) which activates 3 Lights: a green light, a yellow light, and a red light. The behavior of the FSM is the following:
    • the green light stays on for 30 seconds, then
    • the yellow light comes on and stays on for 30 seconds, then
    • the red light comes on and stays on for 30 seconds, then we repeat the pattern.
  • There is only one light on at a given time.


GYRSequencer1.png


Exercise #2

  • Same as Exercise 1, but this time the behavior is the following
    • the green light comes on after the red light and stays on for 30 seconds,
    • the yellow light comes on and stays on for the next for 15 seconds,
    • the red light comes on after the yellow light for 30 seconds.


GYRSequencer2.png


Exercise #3

  • Create a "true" frequency divider that divides by 4.

Exercise #4

  • What is the state diagram of the 3-flip-flop circuit with the following equations:
     D0 = Q0'
     D1 = Q0 XOR Q1
     D2 = Q1 XOR Q2

Exercise #5

  • Same question, but solve it with Python.













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