Carry lookahead adder

Question

can anyone tell me wat is the right equation for carry generator in carry lookahead adder  ?? Confused ..

$ C_{i} = G_{i}+P_{i}C_{i-1}$

$ C_{i+1}=G_{}i+P_{}iC_{}i$

Comments

Second is correct

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Both r same  ...

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try to add 1011 + 0110

according to second one,

$C_1 = A_1B_1 + P1C_0$

$C_1 = 1 + 0$

but we know that $C_1$ is 0

Answer 1

Cî+1=Gî +PìCì

Answer 2

According to above lecture $C_{I}=G_{I}+P_{I}C_{I-1}$