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-- VHDL Entity HAVOC.FPmul_stage1.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_stage1 IS

   PORT(

      FP_A            : IN     std_logic_vector (31 DOWNTO 0);

      FP_B            : IN     std_logic_vector (31 DOWNTO 0);

      clk             : IN     std_logic;

      A_EXP           : OUT    std_logic_vector (7 DOWNTO 0);

      A_SIG           : OUT    std_logic_vector (31 DOWNTO 0);

      B_EXP           : OUT    std_logic_vector (7 DOWNTO 0);

      B_SIG           : OUT    std_logic_vector (31 DOWNTO 0);

      SIGN_out_stage1 : OUT    std_logic;

      isINF_stage1    : OUT    std_logic;

      isNaN_stage1    : OUT    std_logic;

      isZ_tab_stage1  : OUT    std_logic

   );

-- Declarations

END FPmul_stage1 ;

--

-- VHDL Architecture HAVOC.FPmul_stage1.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;

LIBRARY HAVOC;

ARCHITECTURE struct OF FPmul_stage1 IS

   -- Architecture declarations

      -- Non hierarchical truthtable declarations

   -- Internal signal declarations

   SIGNAL A_EXP_int    : std_logic_vector(7 DOWNTO 0);

   SIGNAL A_SIGN       : std_logic;

   SIGNAL A_SIG_int    : std_logic_vector(31 DOWNTO 0);

   SIGNAL A_isINF      : std_logic;

   SIGNAL A_isNaN      : std_logic;

   SIGNAL A_isZ        : std_logic;

   SIGNAL B_EXP_int    : std_logic_vector(7 DOWNTO 0);

   SIGNAL B_SIGN       : std_logic;

   SIGNAL B_SIG_int    : std_logic_vector(31 DOWNTO 0);

   SIGNAL B_isINF      : std_logic;

   SIGNAL B_isNaN      : std_logic;

   SIGNAL B_isZ        : std_logic;

   SIGNAL SIGN_out_int : std_logic;

   SIGNAL isINF_int    : std_logic;

   SIGNAL isNaN_int    : std_logic;

   SIGNAL isZ_tab_int  : std_logic;

   -- Component Declarations

   COMPONENT UnpackFP

   PORT (

      FP    : IN     std_logic_vector (31 DOWNTO 0);

      SIG   : OUT    std_logic_vector (31 DOWNTO 0);

      EXP   : OUT    std_logic_vector (7 DOWNTO 0);

      SIGN  : OUT    std_logic ;

      isNaN : OUT    std_logic ;

      isINF : OUT    std_logic ;

      isZ   : OUT    std_logic ;

      isDN  : OUT    std_logic

   );

   END COMPONENT;

   -- Optional embedded configurations

   -- pragma synthesis_off

   FOR ALL : UnpackFP USE ENTITY HAVOC.UnpackFP;

   -- pragma synthesis_on

BEGIN

   -- Architecture concurrent statements

   -- HDL Embedded Text Block 1 latch

   -- latch 1

   PROCESS(clk)

   BEGIN

      IF RISING_EDGE(clk) THEN

         SIGN_out_stage1 <= SIGN_out_int;

         A_EXP <= A_EXP_int;

         A_SIG <= A_SIG_int;

         isINF_stage1 <= isINF_int;

         isNaN_stage1 <= isNaN_int;

         isZ_tab_stage1 <= isZ_tab_int;

         B_EXP <= B_EXP_int;

         B_SIG <= B_SIG_int;

      END IF;

   END PROCESS;

   -- HDL Embedded Block 2 exceptions

   -- Non hierarchical truthtable

   ---------------------------------------------------------------------------

   exceptions_truth_process: PROCESS(A_isINF, A_isNaN, A_isZ, B_isINF, B_isNaN, B_isZ)

   ---------------------------------------------------------------------------

   BEGIN

      -- Block 1

      IF (A_isINF = '0') AND (A_isNaN = '0') AND (A_isZ = '0') AND (B_isINF = '0') AND (B_isNaN = '0') AND (B_isZ = '0') THEN

         isZ_tab_int <= '0';

         isINF_int <= '0';

         isNaN_int <= '0';

      ELSIF (A_isINF = '1') AND (B_isZ = '1') THEN

         isZ_tab_int <= '0';

         isINF_int <= '0';

         isNaN_int <= '1';

      ELSIF (A_isZ = '1') AND (B_isINF = '1') THEN

         isZ_tab_int <= '0';

         isINF_int <= '0';

         isNaN_int <= '1';

      ELSIF (A_isINF = '1') THEN

         isZ_tab_int <= '0';

         isINF_int <= '1';

         isNaN_int <= '0';

      ELSIF (B_isINF = '1') THEN

         isZ_tab_int <= '0';

         isINF_int <= '1';

         isNaN_int <= '0';

      ELSIF (A_isNaN = '1') THEN

         isZ_tab_int <= '0';

         isINF_int <= '0';

         isNaN_int <= '1';

      ELSIF (B_isNaN = '1') THEN

         isZ_tab_int <= '0';

         isINF_int <= '0';

         isNaN_int <= '1';

      ELSIF (A_isZ = '1') THEN

         isZ_tab_int <= '1';

         isINF_int <= '0';

         isNaN_int <= '0';

      ELSIF (B_isZ = '1') THEN

         isZ_tab_int <= '1';

         isINF_int <= '0';

         isNaN_int <= '0';

      ELSE

         isZ_tab_int <= '0';

         isINF_int <= '0';

         isNaN_int <= '0';

      END IF;

   END PROCESS exceptions_truth_process;

   -- Architecture concurrent statements

   -- ModuleWare code(v1.1) for instance 'I3' of 'xor'

   SIGN_out_int <= A_SIGN XOR B_SIGN;

   -- Instance port mappings.

   I0 : UnpackFP

      PORT MAP (

         FP    => FP_A,

         SIG   => A_SIG_int,

         EXP   => A_EXP_int,

         SIGN  => A_SIGN,

         isNaN => A_isNaN,

         isINF => A_isINF,

         isZ   => A_isZ,

         isDN  => OPEN

      );

   I1 : UnpackFP

      PORT MAP (

         FP    => FP_B,

         SIG   => B_SIG_int,

         EXP   => B_EXP_int,

         SIGN  => B_SIGN,

         isNaN => B_isNaN,

         isINF => B_isINF,

         isZ   => B_isZ,

         isDN  => OPEN

      );

END struct;