I'm trying to analyze the following circuit which is pretty basic.(adsbygoogle = window.adsbygoogle || []).push({});

There is the circuit and it's diagram which is the solution:

http://img822.imageshack.us/img822/7291/circuiti.jpg [Broken]

Please help me find the mistake, because my diagram becomes different from the one in the picture.

Looking at the circuit, I see that:

T1=Co=A*B +A*Cin +B*Cin=Q1*Q1 +Q1*X +Q2*X

T2=S=A XOR B XOR Cin = Q1 XOR Q2 XOR X

and then i get a small table to organize everything:

and obviously if i draw the diagram it looks much different from the one I'm supposed to get.Code (Text):present next

state state

x=0 x=1

Q0 Q1 T1 T2 Z | T1 T2 Z

0 0 0 0 0 0 1 0

0 1 0 1 0 1 0 0

1 0 0 1 0 1 0 0

1 1 1 0 0 1 1 1

Can anyone tell me where did I go wrong?

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# Homework Help: Need some help with a synchronous circuit

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