Analyse Flip-Flops: Strange Sequence Discovered?

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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.
 
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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?
 
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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.