# Need Someone to check my transition table and state diagram

Discussion in 'Homework Help' started by HCN1996, Nov 29, 2015.

1. ### HCN1996 Thread Starter New Member

Nov 29, 2015
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I am a bit confused as to how im supposed to do numbers 2 and 3 on my assigned homework. My completed HW is below

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Last edited: Dec 1, 2015
2. ### WBahn Moderator

Mar 31, 2012
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You say that you haven't covered sequential circuits as all in class, yet this assignment is due on Wednesday.

Color me suspicious.

Look at your inputs to your 2-to-4 decoders. Is the '0' or the '1' input the lsb? Usually the '0' is the lsb. Which signal, 'A' or 'B', corresponds to the lsb (of those two). Ask the same question for the second layer.

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3. ### HCN1996 Thread Starter New Member

Nov 29, 2015
26
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good catch on the decoders. Im not sure why I put them in that order.

4. ### WBahn Moderator

Mar 31, 2012
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Your problem #2 is a Mealy machine. Look that up in your text and see if that helps. There are probably some examples that are worked.

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5. ### HCN1996 Thread Starter New Member

Nov 29, 2015
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We do not have a textbook. I will try to figure out a better start to the table. It is the 1/0, 1/1, 0/0, and 0/1 between the states that throws me off. I have never seen that before and he as not shown us an example in class. He briefly drew those notes in 10 minutes on the 25 and thats all the background I have in this stuff.

6. ### WBahn Moderator

Mar 31, 2012
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HCN1996 likes this.

Nov 29, 2015
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8. ### JoeJester AAC Fanatic!

Apr 26, 2005
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There are over 36,000 results on google for +"mealy machine"

Nov 29, 2015
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anyone?

Nov 29, 2015
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11. ### HCN1996 Thread Starter New Member

Nov 29, 2015
26
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would you mind looking over what I have now? I have since changed all Q0 outputs to 0 and adjusted the state diagram to show that.

12. ### HCN1996 Thread Starter New Member

Nov 29, 2015
26
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this is what I need to be checked.

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13. ### JoeJester AAC Fanatic!

Apr 26, 2005
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My question would be, if Q0 and/or Q1 remains in the initial condition (0), would it even show up on a mealy diagram?

14. ### HCN1996 Thread Starter New Member

Nov 29, 2015
26
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im not sure, my professor has never taught that. Is it wrong? are you saying since q0 is always 0 it shouldnt be there?

edit: im not sure what you are saying ha

15. ### HCN1996 Thread Starter New Member

Nov 29, 2015
26
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are you referring to the table, diagram, or both?

16. ### JoeJester AAC Fanatic!

Apr 26, 2005
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If the next state (1) never occurs why would one include it? On the other hand, it might be an exercise in mealy with zero practical usage in real life.

on edit:

I looked at the diagram and saw that two flip flops did not change state.

17. ### HCN1996 Thread Starter New Member

Nov 29, 2015
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Im thinking it is just an exercise with no practical usage. It's a freshman CE class and he just introduced it. He has not even mentioned that it is called a mealy machine.

18. ### HCN1996 Thread Starter New Member

Nov 29, 2015
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with that being said is my table and diagram correct even though some of it might not be necessary?

19. ### JoeJester AAC Fanatic!

Apr 26, 2005
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I don't know what your instructor wants. I'll let @WBahn weigh in with his opinion as he is an instructor.

20. ### HCN1996 Thread Starter New Member

Nov 29, 2015
26
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Same with me, he has only covered this in one class and never one with 8 states so it has me a little confused. We also havent done these styles of problems before. I tried getting in touch with Wbahn but he hasnt responded.