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-- VHDL Entity HAVOC.FPmul_stage4.interface

--

-- Created by

-- Guillermo Marcus, gmarcus@ieee.org

-- using Mentor Graphics FPGA Advantage tools.

--

-- Visit "http://fpga.mty.itesm.mx" for more info.

--

-- 2003-2004. V1.0

--

LIBRARY ieee;

USE ieee.std_logic_1164.all;

USE ieee.std_logic_arith.all;

ENTITY FPmul_stage4 IS

   PORT(

      EXP_neg       : IN     std_logic;

      EXP_out_round : IN     std_logic_vector (7 DOWNTO 0);

      EXP_pos       : IN     std_logic;

      SIGN_out      : IN     std_logic;

      SIG_out_round : IN     std_logic_vector (27 DOWNTO 0);

      clk           : IN     std_logic;

      isINF_tab     : IN     std_logic;

      isNaN         : IN     std_logic;

      isZ_tab       : IN     std_logic;

      FP_Z          : OUT    std_logic_vector (31 DOWNTO 0)

   );

-- Declarations

END FPmul_stage4 ;

--

-- VHDL Architecture HAVOC.FPmul_stage4.struct

--

-- Created by

-- Guillermo Marcus, gmarcus@ieee.org

-- using Mentor Graphics FPGA Advantage tools.

--

-- Visit "http://fpga.mty.itesm.mx" for more info.

--

-- Copyright 2003-2004. V1.0

--

LIBRARY ieee;

USE ieee.std_logic_1164.all;

USE ieee.std_logic_arith.all;

ARCHITECTURE struct OF FPmul_stage4 IS

   -- Architecture declarations

   -- Internal signal declarations

   SIGNAL EXP_out       : std_logic_vector(7 DOWNTO 0);

   SIGNAL FP            : std_logic_vector(31 DOWNTO 0);

   SIGNAL SIG_isZ       : std_logic;

   SIGNAL SIG_out       : std_logic_vector(22 DOWNTO 0);

   SIGNAL SIG_out_norm2 : std_logic_vector(27 DOWNTO 0);

   SIGNAL isINF         : std_logic;

   SIGNAL isZ           : std_logic;

   -- Component Declarations

   COMPONENT FPnormalize

   GENERIC (

      SIG_width : integer := 28

   );

   PORT (

      SIG_in  : IN     std_logic_vector (SIG_width-1 DOWNTO 0);

      EXP_in  : IN     std_logic_vector (7 DOWNTO 0);

      SIG_out : OUT    std_logic_vector (SIG_width-1 DOWNTO 0);

      EXP_out : OUT    std_logic_vector (7 DOWNTO 0)

   );

   END COMPONENT;

   COMPONENT PackFP

   PORT (

      SIGN  : IN     std_logic ;

      EXP   : IN     std_logic_vector (7 DOWNTO 0);

      SIG   : IN     std_logic_vector (22 DOWNTO 0);

      isNaN : IN     std_logic ;

      isINF : IN     std_logic ;

      isZ   : IN     std_logic ;

      FP    : OUT    std_logic_vector (31 DOWNTO 0)

   );

   END COMPONENT;

   -- Optional embedded configurations

   -- pragma synthesis_off

   FOR ALL : FPnormalize USE ENTITY work.FPnormalize;

   FOR ALL : PackFP USE ENTITY work.PackFP;

   -- pragma synthesis_on

BEGIN

   -- Architecture concurrent statements

   -- HDL Embedded Text Block 1 trim

   -- trim 1 

   SIG_out <= SIG_out_norm2(25 DOWNTO 3);

   -- HDL Embedded Text Block 2 zero

   -- zero 2

   SIG_isZ <= '1' WHEN ((SIG_out_norm2(26 DOWNTO 3)=X"000000") OR

   (EXP_neg='1' AND EXP_out(7)='1')) ELSE '0';

   -- HDL Embedded Text Block 3 isINF_logic

   -- isINF_logic 3

   PROCESS(isZ,isINF_tab, EXP_pos, EXP_out)

   BEGIN

      IF isZ='0' THEN

         IF isINF_tab='1' THEN

            isINF <= '1';

         ELSIF EXP_out=X"FF" THEN

           isINF <='1';

         ELSIF ((EXP_pos='1') AND (EXP_out(7)='0'))  THEN

           isINF <='1';

         ELSE

           isINF <= '0';

         END IF;

      ELSE

          isINF <= '0';

      END IF;

   END PROCESS;

   -- HDL Embedded Text Block 4 latch

   -- latch 4

   PROCESS(clk)

   BEGIN

      IF RISING_EDGE(clk) THEN

         FP_Z <= FP;

      END IF;

   END PROCESS;

   -- ModuleWare code(v1.1) for instance 'I2' of 'or'

   isZ <= SIG_isZ OR isZ_tab;

   -- Instance port mappings.

   I1 : FPnormalize

      GENERIC MAP (

         SIG_width => 28

      )

      PORT MAP (

         SIG_in  => SIG_out_round,

         EXP_in  => EXP_out_round,

         SIG_out => SIG_out_norm2,

         EXP_out => EXP_out

      );

   I3 : PackFP

      PORT MAP (

         SIGN  => SIGN_out,

         EXP   => EXP_out,

         SIG   => SIG_out,

         isNaN => isNaN,

         isINF => isINF,

         isZ   => isZ,

         FP    => FP

      );

END struct;