# What does this circuit do?

Discussion in 'Homework Help' started by nightfury, Aug 29, 2010.

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1. ### nightfury Thread Starter New Member

Aug 29, 2010
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So, The Question is as follows:

Your task is to analyse the logic circuit shown in Figure 2. The inputs to the circuit are C0, A0, B0, A1, B1, A2 and B2. The outputs are S0, S1, S2 and C3. The internal structure of the logic block in the middle of Figure 2 is shown in Figure 3.

The circuit has seven inputs so while you might like to try a few different input com- binations to get a feel for the circuit, I suggest that you do not attempt to construct a full truth table. Rather, you should derive expressions for the outputs and see if you can make sense of the resulting expressions to determine what this logic circuit does.

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2. ### nightfury Thread Starter New Member

Aug 29, 2010
4
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Judging first of all from the nature of the level of our studies and by looking at the circuit itself, I have a hunch that it might be, arithmetic ( i.e Division, multiplication, subtraction, addition in that probable order ) of 3, 3-bit binary numbers.
I made a rough truth table, but it didn't make much sense to me, so I think i might it made it wrong. I am currently working on it, but I am a bit short of time and hence decided to seek help as none of my friends could come up with ideas.
I will work for a bit and keep checking for your replies.
Anything will help, anything.

Tell me if i`m in the right direction, or if possible, the answer.
I will only check back if I cannot solve it myself, but I am short on time so please post your replies.

Thanks

3. ### nightfury Thread Starter New Member

Aug 29, 2010
4
0
Ok a little bit of an update.

I think I might have figured it out

4. ### retched AAC Fanatic!

Dec 5, 2009
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Why yes it is.

5. ### Wendy Moderator

Mar 24, 2008
20,764
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Dat's what I'm seeing.

6. ### nightfury Thread Starter New Member

Aug 29, 2010
4
0
Ah...thanks guys.

7. ### retched AAC Fanatic!

Dec 5, 2009
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You solved you own problem from 9:51am to 10:12am.

You figured it out rather quickly. You seem to be a quick learner.

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8. ### gsanjaya New Member

Jan 18, 2016
2
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hi, do u have the full solutions of this question? thanks

Mar 31, 2012
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