Driver_FFT.vhd
157 lines
| 4.7 KiB
| text/x-vhdl
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VhdlLexer
martin
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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 | ||||
------------------------------------------------------------------------------ | ||||
library IEEE; | ||||
use IEEE.std_logic_1164.all; | ||||
use IEEE.numeric_std.all; | ||||
entity Driver_FFT is | ||||
generic( | ||||
Data_sz : integer range 1 to 32 := 16 | ||||
); | ||||
port( | ||||
clk : in std_logic; | ||||
rstn : in std_logic; | ||||
Load : in std_logic; | ||||
Empty : in std_logic_vector(4 downto 0); | ||||
Full : in std_logic_vector(4 downto 0); | ||||
DATA : in std_logic_vector((5*Data_sz)-1 downto 0); | ||||
Valid : out std_logic; | ||||
Read : out std_logic_vector(4 downto 0); | ||||
Data_re : out std_logic_vector(Data_sz-1 downto 0); | ||||
Data_im : out std_logic_vector(Data_sz-1 downto 0) | ||||
); | ||||
end entity; | ||||
architecture ar_Driver of Driver_FFT is | ||||
type etat is (eX,e0,e1,e2); | ||||
signal ect : etat; | ||||
signal FifoCpt : integer; | ||||
--signal DataTmp : std_logic_vector(Data_sz-1 downto 0); | ||||
signal sEmpty : std_logic; | ||||
signal sFull : std_logic; | ||||
signal sData : std_logic_vector(Data_sz-1 downto 0); | ||||
begin | ||||
process(clk,rstn) | ||||
begin | ||||
if(rstn='0')then | ||||
ect <= eX; | ||||
Read <= (others => '1'); | ||||
Valid <= '0'; | ||||
FifoCpt <= 1; | ||||
martin
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r103 | Data_re <= (others => '0'); | ||
Data_im <= (others => '0'); | ||||
martin
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r98 | |||
elsif(clk'event and clk='1')then | ||||
case ect is | ||||
when eX => | ||||
if(sFull='1')then | ||||
ect <= e0; | ||||
end if; | ||||
when e0 => | ||||
Valid <= '0'; | ||||
if(Load='1' and sEmpty='0')then | ||||
Read(FifoCpt-1) <= '0'; | ||||
ect <= e2; | ||||
-- ect <= e1; | ||||
elsif(sEmpty='1')then | ||||
if(FifoCpt=6)then | ||||
FifoCpt <= 1; | ||||
else | ||||
FifoCpt <= FifoCpt+1; | ||||
end if; | ||||
ect <= eX; | ||||
end if; | ||||
when e1 => | ||||
null; | ||||
-- DataTmp <= sData; | ||||
-- ect <= e2; | ||||
when e2 => | ||||
Read(FifoCpt-1) <= '1'; | ||||
Data_re <= sData; | ||||
Data_im <= (others => '0'); | ||||
-- Data_re <= DataTmp; | ||||
-- Data_im <= sData; | ||||
Valid <= '1'; | ||||
ect <= e0; | ||||
end case; | ||||
end if; | ||||
end process; | ||||
with FifoCpt select | ||||
sFull <= Full(0) when 1, | ||||
Full(1) when 2, | ||||
Full(2) when 3, | ||||
Full(3) when 4, | ||||
Full(4) when 5, | ||||
'1' when others; | ||||
with FifoCpt select | ||||
sEmpty <= Empty(0) when 1, | ||||
Empty(1) when 2, | ||||
Empty(2) when 3, | ||||
Empty(3) when 4, | ||||
Empty(4) when 5, | ||||
'1' when others; | ||||
with FifoCpt select | ||||
sData <= DATA(Data_sz-1 downto 0) when 1, | ||||
DATA((2*Data_sz)-1 downto Data_sz) when 2, | ||||
DATA((3*Data_sz)-1 downto (2*Data_sz)) when 3, | ||||
DATA((4*Data_sz)-1 downto (3*Data_sz)) when 4, | ||||
DATA((5*Data_sz)-1 downto (4*Data_sz)) when 5, | ||||
(others => '0') when others; | ||||
end architecture; | ||||