Difference between revisions of "CSC270 Exercises on FSM"
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** the yellow light comes on and 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. | ** 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. | + | ** There is only one light on at a given time. |
+ | * What is the frequency of your clock signal? | ||
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+ | +---------+ +-------- | ||
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+ | G -----+ +-------------------+ | ||
+ | +---------+ | ||
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+ | Y ---------------+ +----------------- | ||
+ | +---------+ | ||
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+ | R -------------------------+ +------- | ||
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+ | </pre></code> | ||
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** the yellow light comes on and stays on for the next for 15 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. | ** the red light comes on after the yellow light for 30 seconds. | ||
+ | * What is the frequency of your clock signal? | ||
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==Exercise #5== | ==Exercise #5== | ||
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+ | * Same question, but solve it with Python. | ||
+ | * You may find the [[CSC270 Python Operators for Simulation | Python Logic Operators Example Page]] useful for this exercise. | ||
+ | ==Exercise #6== | ||
− | + | * What is the state diagram of this FSM? | |
+ | ** D1= Q0 | ||
+ | ** D0 = ( Q0 ^ Q1 )' | ||
− | < | + | * What happens when the flip-flops start in the state where Q0 and Q1 are both 1? |
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+ | <onlydft> | ||
+ | <code><pre> | ||
# flipflop.py | # flipflop.py | ||
# implements a simple sequencer | # implements a simple sequencer | ||
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19 1 1 1 | 19 1 1 1 | ||
− | </ | + | </pre></code> |
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Latest revision as of 11:13, 2 March 2012
--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.
- What is the frequency of your clock signal?
+---------+ +--------
| | |
G -----+ +-------------------+
+---------+
| |
Y ---------------+ +-----------------
+---------+
| |
R -------------------------+ +-------
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.
- What is the frequency of your clock signal?
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.
- You may find the Python Logic Operators Example Page useful for this exercise.
Exercise #6
- What is the state diagram of this FSM?
- D1= Q0
- D0 = ( Q0 ^ Q1 )'
- What happens when the flip-flops start in the state where Q0 and Q1 are both 1?