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Today I built a 16 bit adder

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Oct. 29th, 2006 | 08:59 pm


Click photo for bigness on me website, as well as photo detailz.

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Comments {8}

(no subject)

from: zuckussi
date: Oct. 30th, 2006 06:03 am (UTC)

Hmm. Explain?

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Alex P.

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from: wetzel
date: Oct. 30th, 2006 06:22 am (UTC)

It adds two binary numbers through the use of many many nested logic gates. It's a bad picture because in the picture it's adding 4105 + 0, which gives 4105

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(no subject)

from: zuckussi
date: Oct. 30th, 2006 06:24 am (UTC)

What is a logic gate, and how does it work?

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(no subject)

from: zuckussi
date: Oct. 30th, 2006 06:25 am (UTC)

And overflow, sign, unsigned, and sub? And the various boxes throughout (logic gates, perhaps)?

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Alex P.

(no subject)

from: wetzel
date: Oct. 30th, 2006 06:48 am (UTC)

http://en.wikipedia.org/wiki/Logic_gate
http://en.wikipedia.org/wiki/And_gate
http://en.wikipedia.org/wiki/OR_gate
http://en.wikipedia.org/wiki/Arithmetic_overflow
http://en.wikipedia.org/wiki/Two%27s_complement

If Sub is 1, the adder subtracts the two numbers
the first row of boxes are bitwise NOTs that can be turned on and off
http://en.wikipedia.org/wiki/Bitwise_NOT#NOT
the second row of boxes are four bit adders

This adder is something that could theoretically be part of a computer's CPU
http://en.wikipedia.org/wiki/ALU
http://en.wikipedia.org/wiki/Adder_%28electronics%29#Multiple-bit_adders

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(no subject)

from: zuckussi
date: Oct. 30th, 2006 06:57 am (UTC)

Hmm. Complicated.

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(no subject)

from: yamansalahi
date: Oct. 30th, 2006 10:13 am (UTC)

did u get that schematic from hacking the gibson?

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Alex P.

(no subject)

from: wetzel
date: Oct. 30th, 2006 05:07 pm (UTC)

what's the gibson?

I created that schematic in logisim

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