library verilog;use verilog.vl_types.all;entity pn_encode is    port(        data_source     : in     vl_logic;        init            : in     vl_logic;        clk_pn          : in     vl_logic;        reset_pn        : in     vl_logic;        flag_tra        : out    vl_logic;        pn_out          : out    vl_logic    );end pn_encode;