Does anyone know about Logic Gates?!

[jamesisninja]

So I have logic gates for homework, and the way my teacher worded a question has me SO confused, someone help! I'm new with the stuff too so it's a tad confusing for me

 

Question: Draw a 5 bit NOR gate Built out 1 and 2 bit gates as needed. 

 

Thanks! 

 

I've got more questions (a whole 10 page assignment! with muxers and demuxers and stuff, but I understand those pretty well, its that 1 question thats killing me!)

[orangecat]

I assume this has something to do with Minecraft...

[jamesisninja]

I assume this has something to do with Minecraft...

 

No, I said it was homework... Not to mention pretty much everything in real life can be made into a logic gate. Light switches, etc etc

[Flojer0]

From a solving the problem stand point what I would do is say that I have two sets of two bit XOR gates and a single one bit XOR. then I have two of those (shouldn't matter which) going into another two bit XOR and the last remaining first tier XOR and the second tier XOR going into a last two bit XOR.

 

honestly I haven't thought it through to see if it would work, but I would either start with something and work from there OR if you know boolean algebra and or karnaugh maps then you could use those to possibly figure out the problem more easily.

 

Edit: I just came up with a counter example to my first paragraph, so you can feel free to disregard that. I would recommend some boolean algebra no-jitsu to solve this

[jamesisninja]

From a solving the problem stand point what I would do is say that I have two sets of two bit XOR gates and a single one bit XOR. then I have two of those (shouldn't matter which) going into another two bit XOR and the last remaining first tier XOR and the second tier XOR going into a last two bit XOR.

 

honestly I haven't thought it through to see if it would work, but I would either start with something and work from there OR if you know boolean algebra and or karnaugh maps then you could use those to possibly figure out the problem more easily.

We learn boolean algebra next week haha

[Flojer0]

We learn boolean algebra next week haha

Alright, well I assume your only tool is good old trial and error then. Or cheating, but you'll never learn that way.

 

Oh, and if you need help visualizing your work and you have time to play around with a new program logisim is very useful for this kind of work.

 

http://ozark.hendrix.edu/~burch/logisim/

[Guest]

Is that the brother of Bill Gates?

 

 

jk

[mr moose]

Unless I my memory has failed me (i haven't done digital electronics since 1996:

A five input (5bit) nor gate, the o at the front indicates that it is a nor gate as opposed to a or gate.

 

[Prikk]

Logic gates??? I wish i remember them. Lol. I remembered the triangle, the patrick's rock, and the penis. Thats how i remembered my logic gates.

[TheRuke]

I don't know a Logic Gates but I do know a guy name Bill. Maybe you've heard of him before?

[Guest]

I know this stuff but I don't know what a Logic Gate is (yet) I'm still in class :3

[Canoas]

So you need a 5 bit NOR and you have other 1/2 bit logic gates? Can't you just use 4 OR gates an a NOT gate? I'll draw it in photoshop in a sec

[mr moose]

I misread your question, I don't think you can get a 1 bit nor gate. that would be an inverter. If canoas doesn't post something up I'll design one for you using standard 74 series components.

[Canoas]

Here it is. The first is the obvious answer, just use OR gates and then negate the output. The second is the not-so-obvious answer based on the principle that everything can be built more efficiently out of NANDs, NORs and NOTs.

 

 

[mr moose]

or just use this:

 

http://www.ti.com/lit/ds/snos297a/snos297a.pdf

[Canoas]

or just use this:

 

http://www.ti.com/lit/ds/snos297a/snos297a.pdf

That won't help him draw a 5 bit nor gate built out of 2 bit gates. That's the datasheet of an integrated circuit, it doesn't include the schematic.

[mr moose]

That won't help him draw a 5 bit nor gate built out of 2 bit gates. That's the datasheet of an integrated circuit, it doesn't include the schematic.

I know, just being a smartarse.   I originally didn't see that he needed it made form 2 input gates which is why put up the pic of a 5 input gate.

[sperkowsky]

No, I said it was homework... Not to mention pretty much everything in real life can be made into a logic gate. Light switches, etc etc

also called an rs nor latch minecraft teaches u these actually so try it out

[Canoas]

also called an rs nor latch minecraft teaches u these actually so try it out

No. A SR NOR latch is made with logic gates but is not a logic gate itself. Also, minecraft would be a terrible tool to teach or learn logic gates.

[Flojer0]

Here it is. The first is the obvious answer, just use OR gates and then negate the output. The second is the not-so-obvious answer based on the principle that everything can be built more efficiently out of NANDs, NORs and NOTs.

 

 

5 gate nor.jpg

 

Oops, I feel retarded now. I wrote my answer thinking I had read XOR, not NOR. That does sound a bit easier. In a lazy 'I don't want to proove it right now' sort of way those both look like they should work fine.