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library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use work.fp_generic.all;

use work.fpmult_stageN_comp.all;

entity fpmult_stageN is

        generic(

                N:integer

        );

        port(

                clk:in std_logic;

                d:in fpmult_stageN_in_type;

                q:out fpmult_stageN_out_type

        );

end;

architecture twoproc of fpmult_stageN is

        type reg_type is record

                a:fp_type;

                b:fp_type;

                p_sign:fp_sign_type;

                p_exp:fp_exp_type;

                p_mantissa:fp_long_mantissa_type;

        end record;

        signal r,rin:reg_type;

begin

        comb:process(d,r)

                variable v:reg_type;

        begin

                -- sample register outputs

                v:=r;

                -- overload

                v.a:=d.a;

                v.b:=d.b;

                v.p_sign:=d.p_sign;

                v.p_exp:=d.p_exp;

                if fp_mantissa(d.b)(N)='1' then

                        v.p_mantissa:=(resize(fp_mantissa(d.a),48) sll N) + d.p_mantissa;

                else

                        v.p_mantissa:=d.p_mantissa;

                end if;

                -- drive register inputs

                rin<=v;

                -- drive outputs

                q.a<=r.a;

                q.b<=r.b;

                q.p_sign<=r.p_sign;

                q.p_exp<=r.p_exp;

                q.p_mantissa<=r.p_mantissa;

        end process;

        seq:process(clk,rin)

        begin

                if rising_edge(clk) then

                        r<=rin;

                end if;

        end process;

end;