<Li> calculation of the inputs for the CLAs from the LCU are done at <Ul> <Li> time 0 for the first CLA </Li> <Li> time 5 for the second, third & fourth CLA </Li> </Ul> </Li> <Ul> <Li> time 0 for the first CLA </Li> <Li> time 5 for the second, third & fourth CLA </Li> </Ul> <Li> time 0 for the first CLA </Li> <Li> time 5 for the second, third & fourth CLA </Li>

Truth table of 4 bit carry look ahead adder