Full adder with look ahead carry

[leonne]

Homework Statement

Draw the logic block for the third cell (s2) if a full adder with carry look ahead show all inputs and output
write equation for Go Po So using inputs of AoBoCo

Homework Equations

The Attempt at a Solution

here is what i have, is this what they are asking?
here is a image
http://imageshack.us/photo/my-images/835/img0062jx.jpg/

ok so looking online it seems like I am missing the lookahead on the bottom right it would look like this
http://en.wikipedia.org/wiki/File:4-bit_carry_lookahead_adder.svg

For the other part,
Po=Ao+Bo
Go=Ao*Bo
So=Ao+Bo+Cio

 

[KataKoniK]

Yes, your diagram is correct. The carry look ahead logic is located at the bottom right of the adder, as shown in the second image you provided.

The equations for Go, Po, and So are also correct. These equations represent the logic for the third cell (s2) in the adder, where Ao and Bo are the inputs for the first two cells and Cio is the carry in.