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comp2.v (223B)

      1 module comp2(a, y);
      2 	input [1:0] a;
      3 	output reg signed [3:0] y;
      4 
      5 	always @ (a) begin
      6 		if (a[0] > a[1])
      7 			y = 4'b0001;
      8 		else if (a[0] == a[1])
      9 			y = 4'b0000;
     10 		else
     11 			/* 2's complement */
     12 			y = 4'b1111;
     13 	end
     14 endmodule