dff.v

module Tiny(switch, led, dip);
  input [1:0] switch;
	input [3:0] dip;
	output [7:0] led;
	reg ff;
	wire d, clk, w1, w2, q1, nq1, w3, w4, q2, nq2;
	
	function NAND;
		input x, y;
		begin
		  NAND = ~(x & y);
		end
	endfunction
	
	assign d = dip[0];
	assign clk = ~switch[0];
	assign w1 = NAND(d, ~clk);
	assign w2 = NAND(w1, ~clk);
	assign led[7] = d;
	assign led[6] = w1;
	assign led[5] = w2;
	
	assign q1 = NAND(w1, nq1);
	assign nq1 = NAND(w2, q1);
	assign led[4] = q1;

	assign w3 = NAND(q1, clk);
	assign w4 = NAND(w3, clk);
	assign led[3] = w3;
	assign led[2] = w4;
	
	assign q2 = NAND(w3, nq2);
	assign nq2 = NAND(w4, q2);
	assign led[1] = q2;
	
endmodule