# logic gates and boolean help in logicsim

#### jamesboxer

Joined Oct 28, 2011
5
Hi
I need help with logic sim, i need to construct a NOR or XOR circuit using NAND gates only.
I have created one already, just wanted to make sure it was correct, I have input 1 and input 2, going into a NOR gate and then output 3.
Is this correct? Or do I need to add a NAND gate in there somewhere..

Also i need to construct a truth tabele for boolean function,
M = x *(y * inverted Z + inverted x * y)
Then I need to build a circuit in logic sim for this..

Can anybody help with these two questions,
thanks

#### zgozvrm

Joined Oct 24, 2009
115
Show us a diagram of your solution.

#### djsfantasi

Joined Apr 11, 2010
7,586
Hi
I need help with logic sim, i need to construct a NOR or XOR circuit using NAND gates only.
I have created one already, just wanted to make sure it was correct, I have input 1 and input 2, going into a NOR gate and then output 3.
Is this correct? Or do I need to add a NAND gate in there somewhere..
Is this homework? If your requirements are to implements a NOR or XOR circuit using NAND gates only, then you shouldn't be wiring up NOR circuits in Logicsim; find the equivalent circuit for the NOR function using ONLY NAND gates. A quick Google search for "NAND gate equivalents" will provide you with many resources. Then wire that circuit in Logicsim.

Also i need to construct a truth tabele (sic) for boolean function,
M = x *(y * inverted Z + inverted x * y)
Then I need to build a circuit in logic sim for this..
You should show us your work in how far you can get constructing the truth table, first.

#### jamesboxer

Joined Oct 28, 2011
5
Yes this is homework. I have created a diagram of the logic sim, it worked fine though but im not sure if it is correct to make the diagram this way. But I have to make a NOR circuit using NAND gates only so i thought this was the correct way. Please check the diagram below with the truth table, thanks

#### Attachments

• 309.4 KB Views: 30

#### jamesboxer

Joined Oct 28, 2011
5
hi could you let me know, thanks

#### jamesboxer

Joined Oct 28, 2011
5
hi please could you let me know, thanks

#### SgtWookie

Joined Jul 17, 2007
22,221
No, your schematic is not correct.

You need to use only NAND gates, yet you have a NOR gate in there.

The connections you have made to the NAND gates on the left will not result in a NOR gate output.

Start by writing down the NOR and NAND gate truth tables. You have the NAND truth table already. Then figure out how you can create a NOR gate using only NAND gates.

These forums are not interactive. It may take hours or even days to receive a reply.

You have posted in the wrong forum. You should have posted in the "Homework Help" forum instead. Expect a Moderator to move it there when one of them sees it.