lpp_memory/Top_FifoWrite.vhd

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------------------------------------------------------------------------------
--  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;
library techmap;
use techmap.gencomp.all;
use work.config.all;


entity Top_FifoWrite is
  generic(
    Data_sz      : integer := 16;
    Addr_sz      : integer := 8;
    addr_max_int : integer := 256);
  port(
    clk,raz  : in std_logic;
    flag_RE  : in std_logic;
    flag_WR  : in std_logic;
    Data_in  : in std_logic_vector(Data_sz-1 downto 0);
    Raddr    : in std_logic_vector(addr_sz-1 downto 0);
    full     : out std_logic;
    Waddr    : out std_logic_vector(addr_sz-1 downto 0);
    Data_out : out std_logic_vector(Data_sz-1 downto 0)
    );
end Top_FifoWrite;


architecture ar_Top_FifoWrite of Top_FifoWrite is

component syncram_2p
    generic (tech : integer := 0; abits : integer := 6; dbits : integer := 8; sepclk : integer := 0);
    port (
        rclk     : in std_ulogic;
        renable  : in std_ulogic;
        raddress : in std_logic_vector((abits -1) downto 0);
        dataout  : out std_logic_vector((dbits -1) downto 0);
        wclk     : in std_ulogic;
        write    : in std_ulogic;
        waddress : in std_logic_vector((abits -1) downto 0);
        datain   : in std_logic_vector((dbits -1) downto 0));
end component;

signal Waddr_int : std_logic_vector(addr_sz-1 downto 0);
signal s_flag_WR : std_logic;
signal s_full    : std_logic;

begin


    WR : entity work.Fifo_Write         generic map(Addr_sz,addr_max_int)
        port map(clk,raz,s_flag_WR,Raddr,s_full,Waddr_int);

   
    SRAM : syncram_2p
        generic map(CFG_MEMTECH,Addr_sz,Data_sz)
        port map(clk,flag_RE,Raddr,Data_out,clk,s_flag_WR,Waddr_int,Data_in);

    
    process(clk,raz)
    begin
        if(raz='0')then            
            s_flag_WR <= '0';

        elsif(clk'event and clk='1')then
            if(s_full='0')then
                s_flag_WR <= Flag_WR;
            else
                s_flag_WR <= '0';
            end if;            
            
        end if;
    end process;

Waddr <= Waddr_int;
full  <= s_full;

end ar_Top_FifoWrite;