--
-- VHDL Architecture FACT_FTM_lib.header_modul.beha
--
-- Created:
--          by - kai.UNKNOWN (E5PCXX)
--          at - 10:30:24 03.03.2011
--
-- using Mentor Graphics HDL Designer(TM) 2009.1 (Build 12)
--
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
USE IEEE.STD_LOGIC_UNSIGNED.all;

library ftm_definitions;
USE ftm_definitions.ftm_array_types.all;
USE ftm_definitions.ftm_constants.all;

ENTITY header_modul IS
PORT(
  clk                       : IN std_logic;
  get_header                : IN std_logic;
  get_header_started        : OUT std_logic := '0';
  get_header_ready          : OUT std_logic := '0';
  board_id                  : IN std_logic_vector (63 DOWNTO 0);
  trigger_counter_read      : OUT std_logic := '0';
  trigger_counter_valid     : IN std_logic;
  trigger_counter           : IN  std_logic_vector (31 DOWNTO 0) := (others => '0');
  get_ts_counter            : OUT std_logic := '0';
  get_ts_counter_started    : IN std_logic;
  get_ts_counter_ready      : IN std_logic;
  timestamp_counter         : IN std_logic_vector (47 DOWNTO 0);
  header_board_id           : OUT std_logic_vector (63 DOWNTO 0) := (others => '0');
  header_firmware_id        : OUT std_logic_vector (15 DOWNTO 0) := (others => '0');
  header_trigger_counter    : OUT std_logic_vector (31 DOWNTO 0) := (others => '0');
  header_timestamp_counter  : OUT std_logic_vector (47 DOWNTO 0) := (others => '0');
  header_current_state      : OUT std_logic_vector (15 DOWNTO 0) := (others => '0');
  current_cc_state          : IN  std_logic_vector (15 DOWNTO 0)
  );
END ENTITY header_modul;

--
ARCHITECTURE beha OF header_modul IS

  type state_header_proc_type is (HP_INIT, HP_CONFIG, HP_IDLE, HP_START, HP_TRG_CNT,
                                  HP_TS_CNT, HP_TS_CNT_END, HP_END);
  
  signal state_header_proc : state_header_proc_type := HP_INIT;

BEGIN
  header_proc : process (clk)
  begin
    if rising_edge (clk) then
      case state_header_proc is
        
        when HP_INIT =>
          state_header_proc <= HP_CONFIG;
          
        when HP_CONFIG =>
          state_header_proc <= HP_IDLE;
          
        when HP_IDLE =>
          if (get_header = '1') then
            get_header_started <= '1';
            get_header_ready <= '0';
            state_header_proc <= HP_START;
          end if;
          
        when HP_START =>
          header_board_id <= board_id;
          header_firmware_id <= X"00" & FIRMWARE_ID;
          header_current_state <= current_cc_state;
          
          trigger_counter_read <= '1';
          state_header_proc <= HP_TRG_CNT;
          
        when HP_TRG_CNT =>
          trigger_counter_read <= '0';
          if (trigger_counter_valid = '1') then
            header_trigger_counter <= trigger_counter;
            get_ts_counter <= '1';
            state_header_proc <= HP_TS_CNT;
          end if;
          
        when HP_TS_CNT =>
          if (get_ts_counter_started = '1') then
            get_ts_counter <= '0';
            state_header_proc <= HP_TS_CNT_END;
          end if;
          
        when HP_TS_CNT_END =>
          if (get_ts_counter_ready = '1') then
            header_timestamp_counter <= timestamp_counter;
            state_header_proc <= HP_END;
          end if;
          
        when HP_END =>
          if (get_header <= '0') then
            get_header_started <= '0';
            get_header_ready <= '1';
            state_header_proc <= HP_IDLE;
          end if;
        
      end case;
    end if;
  end process header_proc;

END ARCHITECTURE beha;