conv.vhd

是Nios II處理器下客製化指令的一個32位元浮點數除法器

-- hds header_start
--
-- VHDL Architecture FPmix32.conv1.untitled
--
-- Created:
--          by - kenboy.UNKNOWN (IBM-BVE1KE4DQ5P)
--          at - 15:25:18 2004/02/07
--
-- Generated by Mentor Graphics' HDL Designer(TM) 2001.5 (Build 170)
--
-- hds header_end
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;


ENTITY conv IS
   PORT( 
      in_X : IN     std_logic_vector (7 DOWNTO 0);
      in_b : IN     std_logic_vector (23 DOWNTO 0);
      a    : OUT    std_logic_vector (23 DOWNTO 0);
      b    : OUT    std_logic_vector (23 DOWNTO 0);
      c    : OUT    std_logic_vector (23 DOWNTO 0);
      d    : OUT    std_logic_vector (22 DOWNTO 0);
      e    : OUT    std_logic_vector (21 DOWNTO 0);
      f    : OUT    std_logic_vector (20 DOWNTO 0);
      g    : OUT    std_logic_vector (19 DOWNTO 0);
      h    : OUT    std_logic_vector (18 DOWNTO 0);
      i    : OUT    std_logic
   );

-- Declarations

END conv ;

-- hds interface_end
ARCHITECTURE untitled OF conv IS

BEGIN
process(in_X,in_b)
 begin
    if(in_X(0)='1')then
	a<= '1'&not in_b(23 downto 1);
	else
	a<="000000000000000000000000";
	end if;

	if(in_X(1)='1')then
	b<=not in_b;
	c(0)<='1';
    else
	b<="000000000000000000000000";
	c(0)<='0';
	end if;

	if(in_X(2)='1')then
	c(23 downto 1)<=not in_b(22 downto 0);
	d(0)<='1';
	else
	c(23 downto 1)<="00000000000000000000000";
	d(0)<='0';
	end if;

	if(in_X(3)='1')then
	d(22 downto 1)<=not in_b(21 downto 0);
	e(0)<='1';
	else
	d(22 downto 1)<="0000000000000000000000";
	e(0)<='0';
	end if;

	if(in_X(4)='1')then
	e(21 downto 1)<=not in_b(20 downto 0);
	f(0)<='1';
	else
	e(21 downto 1)<="000000000000000000000";
	f(0)<='0';
	end if;

	if(in_X(5)='1')then
	f(20 downto 1)<=not in_b(19 downto 0);
	g(0)<='1';
	else
	f(20 downto 1)<="00000000000000000000";
    g(0)<='0';
	end if;

	if(in_X(6)='1')then
	g(19 downto 1)<=not in_b(18 downto 0);
	h(0)<='1';
	else
	g(19 downto 1)<="0000000000000000000";
 	h(0)<='0';
	end if;

	if(in_X(7)='1')then
	h(18 downto 1)<=not in_b(17 downto 0);
	i<='1';
	else
	h(18 downto 1)<="000000000000000000";
	i<='0';
	end if;

	

	end process;
END untitled;