81. JK Flip-Flop

module jk_ff (
    input  CLK,
    input  J,
    input  K,
    output reg Q
);
    always @(posedge CLK) begin
        case ({J, K})
            2'b01 : Q <= 1'b0;
            2'b10 : Q <= 1'b1;
            2'b11 : Q <= ~Q;
            default : Q <= Q;
        endcase
    end

endmodule