transactor_cfg.vhd

-- Some registers to store the config information for the ipbus controller
--
-- Typically used to allow ucontroller to set the mac / ip address
--
-- Dave Newbold, January 2012
 
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

library work;

entity transactor_cfg is
    port(
        clk: in std_logic; -- IPbus clock
        rst: in std_logic; -- Sync reset
        we: in std_logic; -- local bus write enable
        addr: in std_logic_vector(1 downto 0); -- local bus address
        din: in std_logic_vector(31 downto 0); -- local bus data in
        dout: out std_logic_vector(31 downto 0); -- local bus data out
        vec_in: in std_logic_vector(127 downto 0);
        vec_out: out std_logic_vector(127 downto 0)
    );
        
end transactor_cfg;

architecture rtl of transactor_cfg is

    signal s: integer;
    
begin

    s <= to_integer(unsigned(addr));

    process(clk)
    begin
        if rising_edge(clk) then
            if rst = '1' then
                vec_out <= (others => '0');
            elsif we = '1' then 
                vec_out(31 + s * 32 downto s * 32) <= din;
            end if;
        end if;
    end process;
    
    dout <= vec_in(31 + s * 32 downto s * 32);  

end rtl;