Link_Reg.vhd
106 lines
| 3.5 KiB
| text/x-vhdl
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VhdlLexer
martin
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r53 | ------------------------------------------------------------------------------ | ||
-- This file is a part of the LPP VHDL IP LIBRARY | ||||
-- Copyright (C) 2009 - 2010, Laboratory of Plasmas Physic - CNRS | ||||
-- | ||||
-- This program is free software; you can redistribute it and/or modify | ||||
-- it under the terms of the GNU General Public License as published by | ||||
-- the Free Software Foundation; either version 3 of the License, or | ||||
-- (at your option) any later version. | ||||
-- | ||||
-- This program is distributed in the hope that it will be useful, | ||||
-- but WITHOUT ANY WARRANTY; without even the implied warranty of | ||||
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||||
-- GNU General Public License for more details. | ||||
-- | ||||
-- You should have received a copy of the GNU General Public License | ||||
-- along with this program; if not, write to the Free Software | ||||
-- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||||
------------------------------------------------------------------------------ | ||||
-- Author : Martin Morlot | ||||
-- Mail : martin.morlot@lpp.polytechnique.fr | ||||
------------------------------------------------------------------------------ | ||||
library IEEE; | ||||
use IEEE.std_logic_1164.all; | ||||
use IEEE.numeric_std.all; | ||||
use work.FIFO_Config.all; | ||||
--! Programme qui va permettre de "pipeliner" la FIFO, donn�e disponible en sortie d� son �criture en entr�e de la FIFO | ||||
entity Link_Reg is | ||||
generic(Data_sz : integer := 16); | ||||
port( | ||||
clk,raz : in std_logic; --! Horloge et reset general du composant | ||||
Data_one : in std_logic_vector(Data_sz-1 downto 0); --! Donn�e en entr�e de la FIFO, cot� �criture | ||||
Data_two : in std_logic_vector(Data_sz-1 downto 0); --! Donn�e en sortie de la FIFO, cot� lecture | ||||
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r70 | ReUse : in std_logic; --! Flag, Permet de relire la m�moire du d�but | ||
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r53 | flag_RE : in std_logic; --! Flag, Demande la lecture de la m�moire | ||
flag_WR : in std_logic; --! Flag, Demande l'�criture dans la m�moire | ||||
empty : in std_logic; --! Flag, M�moire vide | ||||
Data_out : out std_logic_vector(Data_sz-1 downto 0) --! Donn�e en sortie, pipelin�e | ||||
); | ||||
end Link_Reg; | ||||
architecture ar_Link_Reg of Link_Reg is | ||||
type etat is (e0,e1,e2,e3); | ||||
signal ect : etat; | ||||
begin | ||||
process (clk,raz) | ||||
begin | ||||
if(raz='0')then | ||||
Data_out <= (others => 'X'); | ||||
ect <= e0; | ||||
elsif(clk' event and clk='1')then | ||||
case ect is | ||||
when e0 => | ||||
if(flag_WR='1')then | ||||
Data_out <= Data_one; | ||||
ect <= e1; | ||||
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r70 | elsif(ReUse='1')then | ||
ect <= e1; | ||||
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r53 | end if; | ||
when e1 => | ||||
if(flag_RE='1')then | ||||
Data_out <= Data_two; | ||||
ect <= e2; | ||||
end if; | ||||
when e2 => | ||||
if(empty='1')then | ||||
ect <= e3; | ||||
else | ||||
Data_out <= Data_two; | ||||
ect <= e2; | ||||
end if; | ||||
when e3 => | ||||
Data_out <= Data_two; | ||||
ect <= e0; | ||||
end case; | ||||
end if; | ||||
end process; | ||||
end ar_Link_Reg; | ||||