Hi

I have a question regarding a full adder/substractor. I'm studying for an exam and at the moment I am at the serial and paralel adder. My notes say that we can fasten the serial adder by using the NAND-WIRED-AND wiring (and sth. else, i think it is OR-AND or sth.). Could anybody explain what this could be.

The picture which is attached looks like this: It has a line on NAND elements, and all the outputs are wired in one point (But it is not a short circuit - that I know), and all inputs are inverted, reverse as the equation for the adder says. How can this work?


Thank you, Drags

 

http://www.cs.umass.edu/~verts/cmpsci201/s...Subtractors.pdf
http://www.iit.edu/~uppakal/alu.pdf
http://www.circuitcellar.com/library/ropes...9/c119lrpdf.pdf
http://www.charlespetzold.com/code/TutorColumn.html

didnt get to go through much of the first... but i hope these help.

i'm switchin between reading posts and doing my own homework. lemme know if any of them are useful.

http://www.geocities.com/anneshier2000/New...Negated_AND.htm
added one more