packfp.vhd

一个32位元的浮点数加法器

--
-- VHDL Architecture HAVOC.PackFP.PackFP
--
-- Created:
--          by - Guillermo
--          at - ITESM, 09:57:50 07/16/03
--
-- Generated by Mentor Graphics' HDL Designer(TM) 2002.1b (Build 7)
--
-- hds interface_start
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;

ENTITY PackFP IS
   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 PackFP ;

ARCHITECTURE PackFP OF PackFP IS
BEGIN
PROCESS(isNaN,isINF,isZ,SIGN,EXP,SIG)
BEGIN

	IF (isNaN='1') THEN
		FP(31) <= SIGN;
		FP(30 DOWNTO 23) <= "11111111";
		FP(22 DOWNTO 0) <= "100" & "00000000000000000000";
	ELSIF (isINF='1') THEN
		FP(31) <= SIGN;
		FP(30 DOWNTO 23) <= "11111111";
		FP(22 DOWNTO 0) <= (OTHERS => '0');
	ELSIF (isZ='1') THEN
		FP(31) <= SIGN;
		FP(30 DOWNTO 23) <= "00000000";
		FP(22 DOWNTO 0) <= (OTHERS => '0');
  ELSE	
		FP(31) <= SIGN;
		FP(30 DOWNTO 23) <= EXP;
		FP(22 DOWNTO 0) <= SIG;
	END IF;
END PROCESS;

END PackFP;