题解 | #4bit超前进位加法器电路#

`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
);
wire [3:0]G;
wire [3:0]P;
wire [3:0]C;
assign G=A_in&B_in;
assign P=A_in^B_in;
assign C=G^(P&{C[2:0],C_1});
assign S=P^{C[2:0],C_1};
assign CO=C[3];

endmodule