Linker_FFT.vhd
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| 3.6 KiB
| text/x-vhdl
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VhdlLexer
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r98 | ------------------------------------------------------------------------------ | ||
-- This file is a part of the LPP VHDL IP LIBRARY | ||||
-- Copyright (C) 2009 - 2012, 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 | ||||
------------------------------------------------------------------------------ | ||||
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r345 | LIBRARY IEEE; | ||
USE IEEE.std_logic_1164.ALL; | ||||
USE IEEE.numeric_std.ALL; | ||||
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r345 | ENTITY Linker_FFT IS | ||
GENERIC( | ||||
Data_sz : INTEGER RANGE 1 TO 32 := 16; | ||||
NbData : INTEGER RANGE 1 TO 512 := 256 | ||||
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r98 | ); | ||
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r345 | PORT( | ||
clk : IN STD_LOGIC; | ||||
rstn : IN STD_LOGIC; | ||||
Ready : IN STD_LOGIC; -- | ||||
Valid : IN STD_LOGIC; -- | ||||
Full : IN STD_LOGIC_VECTOR(4 DOWNTO 0); -- | ||||
Data_re : IN STD_LOGIC_VECTOR(Data_sz-1 DOWNTO 0); -- | ||||
Data_im : IN STD_LOGIC_VECTOR(Data_sz-1 DOWNTO 0); -- | ||||
Read : OUT STD_LOGIC; -- Link_Read | ||||
Write : OUT STD_LOGIC_VECTOR(4 DOWNTO 0); -- | ||||
ReUse : OUT STD_LOGIC_VECTOR(4 DOWNTO 0); | ||||
DATA : OUT STD_LOGIC_VECTOR((5*Data_sz)-1 DOWNTO 0) | ||||
); | ||||
END ENTITY; | ||||
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r345 | ARCHITECTURE ar_Linker OF Linker_FFT IS | ||
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r345 | TYPE etat IS (eX, e0, e1, e2); | ||
SIGNAL ect : etat; | ||||
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r345 | SIGNAL DataTmp : STD_LOGIC_VECTOR(Data_sz-1 DOWNTO 0); | ||
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r345 | SIGNAL sRead : STD_LOGIC; | ||
SIGNAL sReady : STD_LOGIC; | ||||
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r345 | SIGNAL FifoCpt : INTEGER RANGE 0 TO 4 := 0; | ||
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r345 | BEGIN | ||
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r345 | PROCESS(clk, rstn) | ||
BEGIN | ||||
IF(rstn = '0')then | ||||
ect <= e0; | ||||
sRead <= '0'; | ||||
sReady <= '0'; | ||||
Write <= (OTHERS => '1'); | ||||
Reuse <= (OTHERS => '0'); | ||||
FifoCpt <= 0; | ||||
ELSIF(clk'EVENT AND clk = '1')then | ||||
sReady <= Ready; | ||||
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r345 | IF(sReady = '1' and Ready = '0')THEN | ||
IF(FifoCpt = 4)THEN | ||||
FifoCpt <= 0; | ||||
ELSE | ||||
FifoCpt <= FifoCpt + 1; | ||||
END IF; | ||||
ELSIF(Ready = '1')then | ||||
sRead <= NOT sRead; | ||||
ELSE | ||||
sRead <= '0'; | ||||
END IF; | ||||
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r345 | CASE ect IS | ||
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r345 | WHEN e0 => | ||
Write(FifoCpt) <= '1'; | ||||
IF(Valid = '1' and Full(FifoCpt) = '0')THEN | ||||
DataTmp <= Data_im; | ||||
DATA(((FifoCpt+1)*Data_sz)-1 DOWNTO (FifoCpt*Data_sz)) <= Data_re; | ||||
Write(FifoCpt) <= '0'; | ||||
ect <= e1; | ||||
ELSIF(Full(FifoCpt) = '1')then | ||||
ReUse(FifoCpt) <= '1'; | ||||
END IF; | ||||
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r345 | WHEN e1 => | ||
DATA(((FifoCpt+1)*Data_sz)-1 DOWNTO (FifoCpt*Data_sz)) <= DataTmp; | ||||
ect <= e0; | ||||
WHEN OTHERS => | ||||
NULL; | ||||
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r345 | END CASE; | ||
END IF; | ||||
END PROCESS; | ||||
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r345 | Read <= sRead; | ||
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r345 | END ARCHITECTURE; | ||