what is the exact difference between carry look ahead adder and carry save adder...?

[srikanth_manukonda]

hi..
i am very confusing about these two adders----> csa and cla

on cla
sum=c ^ p
p= a^b and g =a & b here xor using for p and at sum one xor
and in csa sum c ^ p ^g
p = a | b and g=a & b here at sum 2 xor but for p using one OR

so what is the difference in csa and cla

please some one help....

 

[aruipksni]

hi..
i am very confusing about these two adders----> csa and cla

on cla
sum=c ^ p
p= a^b and g =a & b here xor using for p and at sum one xor
and in csa sum c ^ p ^g
p = a | b and g=a & b here at sum 2 xor but for p using one OR

so what is the difference in csa and cla

please some one help....

check :
https://en.wikipedia.org/wiki/Carry-save_adder

 

[srikanth_manukonda]

check :
https://en.wikipedia.org/wiki/Carry-save_adder

no man ...
i know that will be there in wiki
i can't understood that one...
if you the diff plz explain

 

[dillikumar406]

the main difference is in terms of carry propagation speed. csa has less propagation delay compared to cla. that's why we use propagate (p) and generate (g) terms in prefix adders. output is same but the way of solving and methodology is different depending on the lower level equations.