dest_info_container.vhd

-- Author: Ryan Rivera, FNAL

library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.std_logic_arith.all;
use IEEE.std_logic_unsigned.all;

-- this block latches the mac, ip, and port for the destination
    -- field of UDP packets. Info is valid whenever a properly addressed single byte packet is received.         
    -- Only set the first time after RESET!
entity dest_info_container is
    port (
    
        clk             : in std_logic;
        reset           : in std_logic; 
        we              : in std_logic;             
    
        mac_from_udp    : in std_logic_vector(47 downto 0);  
        ip_from_udp     : in std_logic_vector(31 downto 0);   
        port_from_udp   : in std_logic_vector(15 downto 0);      
        
        dest_mac        : out std_logic_vector(47 downto 0);  
        dest_ip         : out std_logic_vector(31 downto 0);   
        dest_port       : out std_logic_vector(15 downto 0) 
    ) ;
end;


architecture dest_info_container_arch of dest_info_container is  
begin                 
                                       
    process(clk)
    begin   
        if rising_edge(clk) then
            if reset = '1' then              
                
                dest_mac    <=  (others => '0');
                dest_ip     <=  (others => '0');
                dest_port   <=  (others => '0');                            
                
                -- change only if ping packet received (1 byte packet)
            elsif we = '1' then   
                
                dest_mac    <=  mac_from_udp; 
                dest_ip     <=  ip_from_udp; 
                dest_port   <=  port_from_udp;   
                
            end if;                 
        end if;         
    end process;       
    
end dest_info_container_arch;