library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

entity imem2a is
  generic (
    IMEM_BASE : std_ulogic_vector(31 downto 0) := x"00000000"
  );
  port (
    clk_i  : in  std_ulogic;
    rden_i : in  std_ulogic;
    wren_i : in  std_ulogic;
    ben_i  : in  std_ulogic_vector(01 downto 0);
    addr_i : in  std_ulogic_vector(31 downto 0);
    data_i : in  std_ulogic_vector(15 downto 0);
    data_o : out std_ulogic_vector(15 downto 0);
    ack_o  : out std_ulogic
  );
end entity;

architecture notok of imem2a is
  signal addr : std_ulogic_vector(7 downto 0);
  type ram_t is array(0 to 2**8-1) of std_ulogic_vector(15 downto 0);
  signal acc_en : std_ulogic;
begin
  addr <= addr_i(addr'left+2 downto 2); -- word aligned
  acc_en <= '1';

  process(clk_i)
    variable memory : ram_t;
  begin
  if rising_edge(clk_i) and acc_en='1' then
    ack_o <= rden_i or wren_i;
    if wren_i then
      for x in 0 to 1 loop
        if ben_i(x) then
          memory(to_integer(unsigned(addr)))((x+1)*8-1 downto x*8) := data_i((x+1)*8-1 downto x*8);
        end if;
      end loop;
    end if;
    if rden_i then
      data_o <= memory(to_integer(unsigned(addr)));
    end if;
  end if;
  end process;
end architecture;