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

entity tb_mcc_exec is
end tb_mcc_exec;

--------------------------------------------------------------------------------

architecture testbench of tb_mcc_exec is

  constant period : time := 500 ns;
  constant offset : time := 0 us;

  signal CLK_I : std_logic;
  signal RST_I : std_logic;

  
  signal MCC_AXIS_O : std_logic_vector (1 downto 0);
  signal MCC_DONE_O : std_logic;
  signal MCC_EXEC_I : std_logic;
  signal MCC_ERR_O  : std_logic;
  
  signal MCC_ACK_I  : std_logic;
  signal MCC_STB_O  : std_logic;
  
--------------------------------------------------------------------------------

begin

  uut : entity work.mcc_exec
    generic map (
      AXIS_CNT   => 3,
      AXIS_CNT_W => 2)
    port map (
      CLK_I      => CLK_I,
      RST_I      => RST_I,
      MCC_AXIS_O => MCC_AXIS_O,
      MCC_DONE_O => MCC_DONE_O,
      MCC_EN_I   => '1',
      MCC_EXEC_I => MCC_EXEC_I,
      MCC_ERR_O  => MCC_ERR_O,
      MCC_ACK_I  => MCC_ACK_I,
      MCC_STB_O  => MCC_STB_O);

  MCC_EMULATION : process is
  begin
    MCC_ACK_I  <= '0';
    loop
      wait until MCC_STB_O = '1';
      wait for 4*period;
      MCC_ACK_I <= '1';
      wait until MCC_STB_O <= '0';
      MCC_ACK_I <= '0';
    end loop;
  end process MCC_EMULATION;
  
  
  SYSCON_CLK : process is
  begin
    CLK_I <= '0';
    wait for offset;
    loop
      CLK_I <= '1';
      wait for period/2;
      CLK_I <= '0';
      wait for period/2;
    end loop;
  end process;

  SYSCON_RST : process is
  begin
    RST_I <= '0';
    wait for offset;
    wait for 0.75*period;
    RST_I <= '1';
    wait for 2*period;
    RST_I <= '0';
    wait;
  end process;

--------------------------------------------------------------------------------

  UUT_FEED : process is
  begin
    MCC_EXEC_I <= '0';
        
    wait for offset;
    wait for 4*period;

    for i in 0 to 1 loop
      wait for 0.25*period;
      MCC_EXEC_I <= '1';
      wait for period;
      MCC_EXEC_I <= '0';

      wait until MCC_DONE_O = '1';
      wait for 8*period;
    end loop;
    
    wait;
  end process;
  
end testbench;