`timescale 1ns/1ns module lca_4( input [3:0] A_in , input [3:0] B_in , input C_1 , output wire CO , output wire [3:0] S ); //4bit超前进位加法器 wire G_0,G_1,G_2,G_3 ; wire P_0,P_1,P_2,P_3 ; wire CO_0,CO_1,CO_2,CO_3 ; // S = A^B^Ci CO = AB + (A^B)Ci // Gi = Ai&Bi Pi = Ai^Bi assign G_0 = A_in[0] & B_...