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

endmodule