Analyse Flip-Flops: Strange Sequence Discovered?

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Discussion Overview

The discussion revolves around the analysis of a counter circuit involving flip-flops, specifically focusing on the sequence of states it produces. Participants are examining the behavior of the circuit and questioning the correctness of the proposed state transitions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant proposes that the counter transitions through the states 000 -> 100 -> 100 and back to 100, seeking confirmation of this sequence.
  • Another participant questions the nature of the 1T input, asking whether it corresponds to the D input of a D flip-flop or the J input of a JK flip-flop, and whether the circuit diagram is accurate with outputs Q0 and Q1 unconnected.
  • A third participant identifies the flip-flops as T flip-flops and confirms the accuracy of the circuit diagram regarding the unconnected outputs.
  • Another participant challenges the initial sequence, stating that Q2 will toggle with every clock pulse, which contradicts the proposed sequence, and suggests that Q0 will remain constant while Q1's behavior depends on Q2, leading to a repeating pattern of four states.

Areas of Agreement / Disagreement

Participants express differing views on the correctness of the proposed state sequence, with some supporting it and others disputing it. The discussion remains unresolved regarding the accurate behavior of the counter.

Contextual Notes

There are uncertainties regarding the definitions of inputs and the implications of the circuit configuration, as well as the assumptions about the initial states of the flip-flops.

James889
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Hi,

Im trying to analyse this counter
http://img509.imageshack.us/img509/113/pngimg1.png

And my conclusion is that it has a very strange sequence
from state 000 ->100 ->100 and back again to 100...

I just wanted to check with you if that's correct.
 
Last edited by a moderator:
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James889 said:
Hi,

Im trying to analyse this counter
http://img509.imageshack.us/img509/113/pngimg1.png

And my conclusion is that it has a very strange sequence
from state 000 ->100 ->100 and back again to 100...

I just wanted to check with you if that's correct.

What is the 1T input? Is it the D input on a D flip-flop or the J input on a JK flip-flop or something different? And is the picture correct with neither the Q0 or Q1 outputs connected to anything?
 
Last edited by a moderator:
LCKurtz said:
What is the 1T input? Is it the D input on a D flip-flop or the J input on a JK flip-flop or something different? And is the picture correct with neither the Q0 or Q1 outputs connected to anything?

Hi, they are T flip-flops, and yes the picture is correct with neither the q0 nor q1 connected to anything.
 
I don't think your sequence can be correct. One thing for sure is that Q2 will toggle on every clock pulse which your sequence doesn't do. And Q0 won't change from whatever its starting state is. You just have to figure out Q1 knowing its T input is Q2. I get a repeating pattern of 4 independent of what Q0 is.
 

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