additionneur

//additionneur 3bits
module addition(SW,LEDLR,LEDG);
	input[5:0]SW;
	output[5:0]LEDLR;
	output[3:0]LEDG;

	wire[2:0]A,B,S;
	wire[3:1]C;

	assign A=SW[5:3];
	assign B=SW[2:0];

	fa bit0 (A[0],B[0],l'b0,S[0],C[1]);
	fa bit1 (A[1],B[1],C[1],S[1],C[2]);
	fa bit2 (A[2],B[2],C[2],S[2],C[3]);

	assign LEDLR=SW;
	assign LEDG=S;

endmodule

module fa(a,b,ci,s,co);
	input a,b,ci;
	output s,co;

	wirea_xor_b;

	assign a_wor_b=a^b;
	assign s=~a&~b&c|~a&b&~c|a&~b&~c|a&b&c;
	assign co=~a&b&c|a&~b&c|a&b&~c|a&b&c;
endmodule