JKFF2.v

module JKFF2(sw, clk, led);
	input [1:0] sw; // sw[1]:j, sw[0]:k
	input clk;
	output led; // led:Q
	reg q;

	always@(posedge clk) begin
		case ({sw[1], sw[0]})	 // sw[1]:J, sw[0]:K
			2'b00 : q <= q;  // sw[1]=0 & sw[0]=0
			2'b01 : q <= 0;  
			2'b10 : q <= 1;
			2'b11 : q <= ~q; // This is feature of JK-FF.
		endcase
	end
	
	assign led = q;
	
endmodule