source: PROJECT_CORE_MPI/SWITCH_GEN/BRANCHES/v0.02/proto_send.vhd

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-- Company: 
-- Engineer: 
-- 
-- Create Date:    18:01:21 10/23/2012 
-- Design Name: 
-- Module Name:    proto_send - Behavioral 
-- Project Name: 
-- Target Devices: 
-- Tool versions: 
-- Description: 
--
-- Dependencies: 
--
-- Revision: 
-- Revision 0.01 - File Created
-- Additional Comments: 
--
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library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
USE ieee.numeric_std.ALL;
use work.CoreTypes.all;
-- Uncomment the following library declaration if using
-- arithmetic functions with Signed or Unsigned values
--use IEEE.NUMERIC_STD.ALL;

-- Uncomment the following library declaration if instantiating
-- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;

entity proto_send is
generic (sizemem : natural := 64);
 port (
 clk,reset : in std_logic;
 fifo_empty,fifo_full : in std_logic;
  push : out std_logic:='0';
 fifo_in : out std_logic_vector(Word-1 downto 0);
 snd_start : in std_logic; --début de la réception
 snd_ack :in std_logic;   -- acquittement de la réception
 snd_comp : out std_logic; -- fin de la réception
 mem :in memory(0 to sizemem-1));

end proto_send;

architecture Behavioral of proto_send is
type typ_send is (s_head,s_len,s_len2,s_data,s_pulse,s_end);
 signal etsnd : typ_send;
 signal sfifo_in : std_logic_vector(Word-1 downto 0);
 signal spush : std_logic:='0';
begin

proc_send : process (clk,reset)
variable dlen,i: natural range 0 to 255 :=0;
        begin
        if reset='1' then 
                                 etsnd<=s_head;
                                 
                                else  
                                                if rising_edge(clk) then -- le process s'exécute sur chaque front 
                                                                                                                        -- montant de l'horloge
                                                case etsnd is
                                                when s_head  =>
                                                        sfifo_in<=mem(0);
                                                        snd_comp<='0';
                                                        i:=0;
                                                        
                                                        if fifo_empty='1' and snd_start='1' then
                                                        spush<='1';
                                                        snd_comp<='0';
                                                        etsnd<=s_len;
                                                        end if;
                                                when s_pulse =>
                                                        spush<='1';
                                                        etsnd<=s_len;
                                                when s_len  =>
                                                        sfifo_in<=mem(1); --8 données
                                                        i:=i+1;
                                                        dlen:=to_integer(unsigned(mem(i)));
                                                        spush<='1';
                                                        snd_comp<='0';
                                                        etsnd<=s_data;
                                                when s_len2 =>
                                                        snd_comp<='0';
                                                                etsnd<=s_data;
                                                                
                                                when s_data  =>
                                                                if fifo_full='0' then
                                                                i:=i+1;
                                                                sfifo_in<=mem(i);
                                                                        if i=dlen-2 then
                                                                                etsnd<=s_end;
                                                                                snd_comp<='1';
                                                                                spush<='1';
                                                                        else
                                                                                spush<='1';
                                                                        end if;
                                                                        
                                                                else
                                                                spush<='0';
                                                                end if;
                                                
                                                when s_end  =>
                                                                spush<='0';
                                                                etsnd<=s_head;
                                                                sfifo_in<=(others=>'-');
                                                                if snd_ack='1' then
                                                                        etsnd<=s_head;
                                                                end if;
                                                when others =>
                                                                spush<='0';
                                                                etsnd<=s_head;
                                                                sfifo_in<=(others=>'0');
                                                end case;
                                                end if;
                                end if;
        end process;
        
        -- affectation concurentes
        
        push<=spush;
        fifo_in<=sfifo_in;
end Behavioral;