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 Post subject: Basic circuit (gate) designPosted: Fri, 2 Mar 2012 20:33:28 UTC
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Joined: Tue, 21 Feb 2012 04:30:18 UTC
Posts: 16
Ok so I have an assignment, and a couple of the problems are constructing XOR operators using only NAND gates for one of the problems, and only AND, OR, and NOT gates for the other problem. I have the latter done, but it seems to be overly complicated and I dont have OR gates at all. I just used a hint that the book gave. Heres the expression that the circuit represents

((x'y)'(xy')')'

This looked much cleaner using bars for NOTs, but I hope you get the picture. Sadly, I don't know how to draw the circuit in here haha. But yea, that expression is what the book says x XOR y equals.

I am a computer science student, not an electrical engineer or computer engineering student, so I've never really done any of this before. Any hints would be much appreciated! Please, no answer though

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 Post subject: Re: Basic circuit (gate) designPosted: Fri, 2 Mar 2012 22:23:23 UTC
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Joined: Wed, 30 Mar 2005 04:25:14 UTC
Posts: 12103
Location: Austin, TX
ResidentBiscuit wrote:
Ok so I have an assignment, and a couple of the problems are constructing XOR operators using only NAND gates for one of the problems, and only AND, OR, and NOT gates for the other problem. I have the latter done, but it seems to be overly complicated and I dont have OR gates at all. I just used a hint that the book gave. Heres the expression that the circuit represents

((x'y)'(xy')')'

This looked much cleaner using bars for NOTs, but I hope you get the picture. Sadly, I don't know how to draw the circuit in here haha. But yea, that expression is what the book says x XOR y equals.

I am a computer science student, not an electrical engineer or computer engineering student, so I've never really done any of this before. Any hints would be much appreciated! Please, no answer though

Draw the truth table for both and see that they give the same outputs, and that proves they're the same.

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 Post subject: Re: Basic circuit (gate) designPosted: Fri, 2 Mar 2012 22:25:50 UTC
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Joined: Tue, 21 Feb 2012 04:30:18 UTC
Posts: 16
Well I have. They both work, but I didn't use any OR gates in there. And it seems more complicated than just x XOR y

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 Post subject: Re: Basic circuit (gate) designPosted: Fri, 2 Mar 2012 22:30:59 UTC
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Joined: Wed, 30 Mar 2005 04:25:14 UTC
Posts: 12103
Location: Austin, TX
ResidentBiscuit wrote:
Well I have. They both work, but I didn't use any OR gates in there. And it seems more complicated than just x XOR y

Are you supposed to use at least one or gate? If not, then don't worry about it, if so then just tack on an AND (x OR x') which is true when the regular expression is and false otherwise.

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