Subversion Repositories pcie_sg_dma

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

-- Company: 

-- Engineer: 

-- 

-- Design Name: 

-- Module Name:    DMA_FSM - Behavioral 

-- Project Name: 

-- Target Devices: 

-- Tool versions: 

-- Description: 

--               The state machine controls the DMA routine, writes the channel

--               buffer, as well as outputs DMA stata.

--

-- Dependencies: 

--

-- Revision 1.00 - Created. 25.07.2007

-- 

-- Additional Comments: 

--

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

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

library work;

use work.abb64Package.all;

-- Uncomment the following library declaration if instantiating

-- any Xilinx primitives in this code.

--library UNISIM;

--use UNISIM.VComponents.all;

entity DMA_FSM is

    port (

      -- Fixed word for 1st header of TLP: MRd/MWr

      TLP_Has_Payload    : IN  std_logic;

      TLP_Hdr_is_4DW     : IN  std_logic;

      DMA_Addr_Inc       : IN  std_logic;

      DMA_BAR_Number     : IN  std_logic_vector(C_ENCODE_BAR_NUMBER-1 downto 0);

      -- FSM control signals

      DMA_Start          : IN  std_logic;

      DMA_Start2         : IN  std_logic;

      DMA_Stop           : IN  std_logic;

      DMA_Stop2          : IN  std_logic;

      No_More_Bodies     : IN  std_logic;

      ThereIs_Snout      : IN  std_logic;

      ThereIs_Body       : IN  std_logic;

      ThereIs_Tail       : IN  std_logic;

      ThereIs_Dex        : IN  std_logic;

      -- Parameters to be written into ChBuf

      DMA_PA_Loaded      : IN  std_logic_vector(C_DBUS_WIDTH-1 downto 0);

      DMA_PA_Var         : IN  std_logic_vector(C_DBUS_WIDTH-1 downto 0);

      DMA_HA_Var         : IN  std_logic_vector(C_DBUS_WIDTH-1 downto 0);

      DMA_BDA_fsm        : IN  std_logic_vector(C_DBUS_WIDTH-1 downto 0);

      BDA_is_64b_fsm     : IN  std_logic;

      DMA_Snout_Length   : IN  std_logic_vector(C_MAXSIZE_FLD_BIT_TOP downto  0);

      DMA_Body_Length    : IN  std_logic_vector(C_MAXSIZE_FLD_BIT_TOP downto 0);

      DMA_Tail_Length    : IN  std_logic_vector(C_TLP_FLD_WIDTH_OF_LENG+1 downto  0);

      -- Busy/Done conditions

      Done_Condition_1   : IN  std_logic;

      Done_Condition_2   : IN  std_logic;

      Done_Condition_3   : IN  std_logic;

      Done_Condition_4   : IN  std_logic;

      Done_Condition_5   : IN  std_logic;

      -- Channel buffer write

      us_MWr_Param_Vec   : IN  std_logic_vector(6-1   downto 0);

      ChBuf_aFull        : IN  std_logic;

      ChBuf_WrEn         : OUT std_logic;

      ChBuf_WrDin        : OUT std_logic_vector(C_CHANNEL_BUF_WIDTH-1 downto 0);

      -- FSM indicators

      State_Is_LoadParam : OUT std_logic;

      State_Is_Snout     : OUT std_logic;

      State_Is_Body      : OUT std_logic;

      State_Is_Tail      : OUT std_logic;

      DMA_Cmd_Ack        : OUT std_logic;

      -- To Tx Port

      ChBuf_ValidRd      : IN  std_logic;

      BDA_nAligned       : OUT std_logic;

      DMA_TimeOut        : OUT std_logic;

      DMA_Busy           : OUT std_logic;

      DMA_Done           : OUT std_logic;

--      DMA_Done_Rise      : OUT std_logic;

      -- Tags

      Pkt_Tag            : IN  std_logic_vector(C_TAG_WIDTH-1 downto 0);

      Dex_Tag            : IN  std_logic_vector(C_TAG_WIDTH-1 downto 0);

      -- Common ports

      dma_clk            : IN  std_logic;

      dma_reset          : IN  std_logic

    );

end entity DMA_FSM;

architecture Behavioral of DMA_FSM is

  --   DMA operation control FSM

  type DMAStates is            (

                                 -- dmaST_Init: Initial state at reset.

                                 dmaST_Init

                                 -- dmaST_Load_Param: Load DMA parameters (PA, HA, BDA and Leng).

                               , dmaST_Load_Param

                                 -- dmaST_Snout: 1st TLP might be non-integeral of MAX_SIZE.

                               , dmaST_Snout

                                 -- dmaST_Stomp: after every ChBuf write, pause a clock before taking

                                 --              next write.  This state checks the availability of 

                                 --              the ChBuf (channel buffer) for write.

                               , dmaST_Stomp

                                 -- dmaST_Body: TLP's in the middle, always integeral of MAX_SIZE.

                               , dmaST_Body

                                 -- dmaST_Tail: the last TLP, similar with the 1st one, whose size 

                                 --             should be specially calculated.

                               , dmaST_Tail

--                                 -- dmaST_Before_Dex: before writing the MRd TLP (for next descriptor)

--                                 --                   information for the next descriptor (if any), 

--                                 --                   a pause is needed to wait for the ChBuf available.

--                               , dmaST_Before_Dex

                                 -- dmaST_NextDex: writing the descriptor MRd TLP information to 

                                 --                the ChBuf.

                               , dmaST_NextDex

                                 -- dmaST_Await_Dex: after MRd(descriptor) info is written in the ChBuf, 

                                 --                  the state machine waits for the descriptor's 

                                 --                  arrival.

                               , dmaST_Await_Dex

                               );

  signal DMA_NextState         : DMAStates;

  signal DMA_State             : DMAStates;

  -- Busy/Done state bits generation

  type FSM_BusyDone is         (

                                 FSM_Idle

                               , FSM_Busy1

                               , FSM_Busy2

                               , FSM_Busy3

                               , FSM_Busy4

                               , FSM_Busy5

                               , FSM_Done

                               );

  signal BusyDone_NextState    : FSM_BusyDone;

  signal BusyDone_State        : FSM_BusyDone;

  -- Time-out state

  type FSM_Time_Out is         (

                                 toutSt_Idle

                               , toutSt_CountUp

                               , toutSt_Pause

                               );

  signal DMA_TimeOut_State     : FSM_Time_Out;

  --  DMA Start command from MWr channel

  signal  DMA_Start_r1         : std_logic;

  --  DMA Start command from CplD channel

  signal  DMA_Start2_r1        : std_logic;

  --  Registered Dex indicator

  signal  ThereIs_Dex_reg      : std_logic;

  signal  ThereIs_Snout_reg    : std_logic;

  signal  ThereIs_Body_reg     : std_logic;

  signal  ThereIs_Tail_reg     : std_logic;

  -- DMA Stutus monitor

  signal  BDA_nAligned_i       : std_logic;

  signal  DMA_Busy_i           : std_logic;

  signal  DMA_Done_i           : std_logic;

  -- FSM state indicators

  signal  State_Is_LoadParam_i : std_logic;

  signal  State_Is_Snout_i     : std_logic;

  signal  State_Is_Body_i      : std_logic;

  signal  State_Is_Tail_i      : std_logic;

  signal  State_Is_AwaitDex_i  : std_logic;

  --  Acknowledge for DMA_Start command

  signal  DMA_Cmd_Ack_i        : std_logic;

  -- channel FIFO Write control

  signal  ChBuf_WrDin_i        : std_logic_vector(C_CHANNEL_BUF_WIDTH-1 downto 0);

  signal  ChBuf_WrEn_i         : std_logic;

  signal  ChBuf_aFull_i        : std_logic;

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

  --    Time-out calculation :  invisible to the user, so moved out of the abbPackage

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

  signal  cnt_DMA_TO           : std_logic_vector(C_TOUT_WIDTH-1 downto  0);

  signal  Tout_Lo_Carry        : std_logic;

  signal  DMA_TimeOut_i        : std_logic;

  -- Carry bit, only for better timing

  Constant  CBIT_TOUT_CARRY    : integer  := C_TOUT_WIDTH/2;

begin

   -- As DMA Statuses

   BDA_nAligned       <=  BDA_nAligned_i ;

   DMA_Busy           <=  DMA_Busy_i     ;

   DMA_Done           <=  DMA_Done_i     ;

--   DMA_Done_Rise      <=  DMA_Done_Rise_i;

   DMA_TimeOut        <=  DMA_TimeOut_i  ;

   -- Abstract buffer write control

   ChBuf_WrEn         <=  ChBuf_WrEn_i;

   ChBuf_WrDin        <=  ChBuf_WrDin_i;

   ChBuf_aFull_i      <=  ChBuf_aFull;

   -- FSM State indicators

   State_Is_LoadParam <=  State_Is_LoadParam_i;

   State_Is_Snout     <=  State_Is_Snout_i;

   State_Is_Body      <=  State_Is_Body_i;

   State_Is_Tail      <=  State_Is_Tail_i;

   DMA_Cmd_Ack        <=  DMA_Cmd_Ack_i;

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

-- Syn_Delay: DMA_Start

--            DMA_Start2

-- 

   Syn_Delay_DMA_Starts:

   process ( dma_clk)

   begin

      if dma_clk'event and dma_clk = '1' then

         DMA_Start_r1    <= DMA_Start;

         DMA_Start2_r1   <= DMA_Start2;

      end if;

   end process;

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

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

---- 

-- States synchronous: DMA

---- 

   Syn_DMA_States:

   process ( dma_clk, dma_reset)

   begin

      if dma_reset = '1' then

         DMA_State   <= dmaST_Init;

      elsif dma_clk'event and dma_clk = '1' then

         DMA_State   <= DMA_NextState;

      end if;

   end process;

-- Next States: DMA

   Comb_DMA_NextState:

   process (

             DMA_State

           , DMA_Start_r1

           , DMA_Start2_r1

           , ChBuf_aFull_i

           , No_More_Bodies

           , ThereIs_Snout  --_reg

--           , ThereIs_Body

           , ThereIs_Tail_reg

           , ThereIs_Dex_reg

           )

   begin

     case DMA_State  is

       when dmaST_Init  =>

          if DMA_Start_r1 = '1' then

             DMA_NextState <= dmaST_Load_Param;

          else

             DMA_NextState <= dmaST_Init;

          end if;

       when dmaST_Load_Param  =>

          if ChBuf_aFull_i = '1' then

             DMA_NextState <= dmaST_Load_Param;

          elsif ThereIs_Dex_reg = '1' then

             DMA_NextState <= dmaST_NextDex;

          elsif ThereIs_Snout = '1' then

             DMA_NextState <= dmaST_Snout;

--          elsif ThereIs_Body = '1' then

--             DMA_NextState <= dmaST_Stomp;

          else

             DMA_NextState <= dmaST_Stomp;

          end if;

       when dmaST_NextDex  =>

          if ThereIs_Snout = '1' then

             DMA_NextState <= dmaST_Snout;

          elsif No_More_Bodies = '0' then

             DMA_NextState <= dmaST_Body;

          else

             DMA_NextState <= dmaST_Await_Dex;

          end if;

       when dmaST_Snout  =>

             DMA_NextState <= dmaST_Stomp;

       when dmaST_Stomp  =>

          if ChBuf_aFull_i = '1' then

             DMA_NextState <= dmaST_Stomp;

          elsif No_More_Bodies= '0' then

             DMA_NextState <= dmaST_Body;

          elsif ThereIs_Tail_reg= '1' then

             DMA_NextState <= dmaST_Tail;

          elsif ThereIs_Dex_reg= '1' then

             DMA_NextState <= dmaST_Await_Dex;

          else

             DMA_NextState <= dmaST_Init;

          end if;

       when dmaST_Body  =>

             DMA_NextState <= dmaST_Stomp;

       when dmaST_Tail  =>

          if ThereIs_Dex_reg = '1' then

            DMA_NextState <= dmaST_Await_Dex;

          else

            DMA_NextState <= dmaST_Init;

          end if;

       when dmaST_Await_Dex  =>

          if DMA_Start2_r1 = '1' then

             DMA_NextState <= dmaST_Load_Param;

          else

             DMA_NextState <= dmaST_Await_Dex;

          end if;

       when Others  =>

          DMA_NextState <= dmaST_Init;

     end case;   -- DMA_State

   end process;

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

-- States synchronous: DMA_Cmd_Ack

--                     equivalent to State_Is_LoadParam

--

   Syn_DMA_Cmd_Ack:

   process ( dma_clk, dma_reset)

   begin

      if dma_reset = '1' then

         DMA_Cmd_Ack_i   <= '0';

      elsif dma_clk'event and dma_clk = '1' then

         if DMA_NextState = dmaST_Load_Param  then

            DMA_Cmd_Ack_i  <= '1';

         else

            DMA_Cmd_Ack_i  <= '0';

         end if;

      end if;

   end process;

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

-- States synchronous: ThereIs_Dex_reg

--

   Syn_ThereIs_Dex_reg:

   process ( dma_clk, dma_reset)

   begin

      if dma_reset = '1' then

         ThereIs_Dex_reg   <= '0';

         ThereIs_Snout_reg <= '0';

         ThereIs_Body_reg  <= '0';

         ThereIs_Tail_reg  <= '0';

      elsif dma_clk'event and dma_clk = '1' then

         if    DMA_Start = '1'

            or State_Is_LoadParam_i = '1'

            or State_Is_AwaitDex_i ='1'

            then

            ThereIs_Dex_reg    <= ThereIs_Dex;

            ThereIs_Snout_reg  <= ThereIs_Snout;

            ThereIs_Body_reg   <= ThereIs_Body;

            ThereIs_Tail_reg   <= ThereIs_Tail;

         else

            ThereIs_Dex_reg    <= ThereIs_Dex_reg;

            ThereIs_Snout_reg  <= ThereIs_Snout_reg;

            ThereIs_Body_reg   <= ThereIs_Body_reg;

            ThereIs_Tail_reg   <= ThereIs_Tail_reg;

         end if;

      end if;

   end process;

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

-- Synchronous reg: 

--                  State_Is_LoadParam

--                  State_Is_Snout

--                  State_Is_Body

--                  State_Is_Tail

--                  State_Is_AwaitDex

--

   FSM_State_Is_i:

   process ( dma_clk, dma_reset)

   begin

      if dma_reset = '1' then

         State_Is_LoadParam_i <= '0';

         State_Is_Snout_i     <= '0';

         State_Is_Body_i      <= '0';

         State_Is_Tail_i      <= '0';

         State_Is_AwaitDex_i  <= '0';

      elsif dma_clk'event and dma_clk = '1' then

         if DMA_NextState= dmaST_Load_Param then

            State_Is_LoadParam_i <= '1';

         else

            State_Is_LoadParam_i <= '0';

         end if;

         if DMA_NextState= dmaST_Snout then

            State_Is_Snout_i <= '1';

         else

            State_Is_Snout_i <= '0';

         end if;

         if DMA_NextState= dmaST_Body then

            State_Is_Body_i <= '1';

         else

            State_Is_Body_i <= '0';

         end if;

         if DMA_NextState= dmaST_Tail then

            State_Is_Tail_i <= '1';

         else

            State_Is_Tail_i <= '0';

         end if;

         if DMA_NextState= dmaST_Await_Dex then

            State_Is_AwaitDex_i <= '1';

         else

            State_Is_AwaitDex_i <= '0';

         end if;

      end if;

   end process;

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

-- Synchronous Output: DMA_Abstract_Buffer_Write

-- 

-- DMA Channel (downstream and upstream) Buffers (128-bit) definition:

--     Note: Type not shows in this buffer

--

--  127 ~ xxx : Peripheral address

--  xxy ~  96 : reserved

--         95 : Address increments

--         94 : Valid

--   93 ~  30 : Host Address

--   29 ~  27 : BAR number

--   26 ~  19 : Tag

-- 

--   18 ~  17 : Format

--   16 ~  14 : TC

--         13 : TD

--         12 : EP

--   11 ~  10 : Attribute

--    9 ~   0 : Length

-- 

   FSM_DMA_Abstract_Buffer_Write:

   process ( dma_clk, dma_reset)

   begin

      if dma_reset = '1' then

         ChBuf_WrEn_i   <= '0';

         ChBuf_WrDin_i  <= (OTHERS =>'0');

      elsif dma_clk'event and dma_clk = '1' then

         case DMA_State is

            when dmaST_NextDex =>

                 ChBuf_WrEn_i  <= '1';

                 ChBuf_WrDin_i   <= (OTHERS=>'0');   -- must be the first argument

                 ChBuf_WrDin_i(C_CHBUF_HA_BIT_TOP downto C_CHBUF_HA_BIT_BOT)            <= DMA_BDA_fsm;

                 ChBuf_WrDin_i(C_CHBUF_MA_BIT_TOP downto C_CHBUF_MA_BIT_BOT)            <= C_ALL_ZEROS(C_CHBUF_MA_BIT_TOP downto C_CHBUF_MA_BIT_BOT);    -- any value

                 ChBuf_WrDin_i(C_CHBUF_TAG_BIT_TOP downto C_CHBUF_TAG_BIT_BOT)          <= Dex_Tag;

                 ChBuf_WrDin_i(C_CHBUF_DMA_BAR_BIT_TOP downto C_CHBUF_DMA_BAR_BIT_BOT)  <= DMA_BAR_Number;

                 ChBuf_WrDin_i(C_CHBUF_FMT_BIT_TOP)                                     <= C_TLP_HAS_NO_DATA;  --C_MRD_HEAD0_WORD(C_TLP_FMT_BIT_TOP);

                 ChBuf_WrDin_i(C_CHBUF_FMT_BIT_BOT)                                     <= BDA_is_64b_fsm;

                 ChBuf_WrDin_i(C_CHBUF_LENG_BIT_TOP downto C_CHBUF_LENG_BIT_BOT)        <= C_NEXT_BD_LENGTH(C_TLP_FLD_WIDTH_OF_LENG+1 downto 2);

                 ChBuf_WrDin_i(C_CHBUF_QVALID_BIT)                                      <= '1';

                 ChBuf_WrDin_i(C_CHBUF_AINC_BIT)                                        <= DMA_Addr_Inc;  -- any value

                 ChBuf_WrDin_i(C_CHBUF_ATTR_BIT_TOP downto C_CHBUF_ATTR_BIT_BOT)        <= C_RELAXED_ORDERING & C_NO_SNOOP;

            when dmaST_Snout =>

                 ChBuf_WrEn_i   <= '1';

                 ChBuf_WrDin_i   <= (OTHERS=>'0');   -- must be the first argument

                 ChBuf_WrDin_i(C_CHBUF_HA_BIT_TOP downto C_CHBUF_HA_BIT_BOT)    <= DMA_HA_Var;

                 if    DMA_BAR_Number=CONV_STD_LOGIC_VECTOR(CINT_FIFO_SPACE_BAR, C_ENCODE_BAR_NUMBER) then

                   ChBuf_WrDin_i(C_CHBUF_PA_BIT_TOP downto C_CHBUF_PA_BIT_BOT)    <= DMA_PA_Loaded(C_EP_AWIDTH-1 downto 0);

                 elsif DMA_BAR_Number=CONV_STD_LOGIC_VECTOR(CINT_BRAM_SPACE_BAR, C_ENCODE_BAR_NUMBER) then

                   ChBuf_WrDin_i(C_CHBUF_MA_BIT_TOP downto C_CHBUF_MA_BIT_BOT)    <= DMA_PA_Loaded(C_PRAM_AWIDTH-1+2 downto 0);

                 elsif DMA_BAR_Number=CONV_STD_LOGIC_VECTOR(CINT_DDR_SPACE_BAR, C_ENCODE_BAR_NUMBER) then

                   ChBuf_WrDin_i(C_CHBUF_DDA_BIT_TOP downto C_CHBUF_DDA_BIT_BOT)  <= DMA_PA_Loaded(C_DDR_IAWIDTH-1 downto 0);

                 else

                   ChBuf_WrDin_i(C_CHBUF_MA_BIT_TOP downto C_CHBUF_MA_BIT_BOT)    <= C_ALL_ZEROS(C_CHBUF_MA_BIT_TOP downto C_CHBUF_MA_BIT_BOT);

                 end if;

                 ChBuf_WrDin_i(C_CHBUF_TAG_BIT_TOP downto C_CHBUF_TAG_BIT_BOT)          <= Pkt_Tag;

                 ChBuf_WrDin_i(C_CHBUF_DMA_BAR_BIT_TOP downto C_CHBUF_DMA_BAR_BIT_BOT)  <= DMA_BAR_Number;

                 ChBuf_WrDin_i(C_CHBUF_FMT_BIT_TOP)                                     <= TLP_Has_Payload;

                 ChBuf_WrDin_i(C_CHBUF_FMT_BIT_BOT)                                     <= TLP_Hdr_is_4DW;

                 if DMA_BAR_Number=CONV_STD_LOGIC_VECTOR(CINT_FIFO_SPACE_BAR, C_ENCODE_BAR_NUMBER) then

                   ChBuf_WrDin_i(C_CHBUF_LENG_BIT_TOP downto C_CHBUF_LENG_BIT_BOT)        <= DMA_Snout_Length(C_TLP_FLD_WIDTH_OF_LENG+1 downto 3) & '0';

                 else

                   ChBuf_WrDin_i(C_CHBUF_LENG_BIT_TOP downto C_CHBUF_LENG_BIT_BOT)        <= DMA_Snout_Length(C_TLP_FLD_WIDTH_OF_LENG+1 downto 2);

                 end if;

                 ChBuf_WrDin_i(C_CHBUF_QVALID_BIT)                                      <= '1';

                 ChBuf_WrDin_i(C_CHBUF_AINC_BIT)                                        <= DMA_Addr_Inc;

                 ChBuf_WrDin_i(C_CHBUF_TC_BIT_TOP downto C_CHBUF_TC_BIT_BOT)            <= us_MWr_Param_Vec(2 downto 0);

                 ChBuf_WrDin_i(C_CHBUF_ATTR_BIT_TOP downto C_CHBUF_ATTR_BIT_BOT)        <= us_MWr_Param_Vec(5 downto 4);  -- C_RELAXED_ORDERING & C_NO_SNOOP;

            when dmaST_Body =>

                 ChBuf_WrEn_i   <= '1';

                 ChBuf_WrDin_i   <= (OTHERS=>'0');   -- must be the first argument

                 ChBuf_WrDin_i(C_CHBUF_HA_BIT_TOP downto C_CHBUF_HA_BIT_BOT)     <= DMA_HA_Var;

                 if    DMA_BAR_Number=CONV_STD_LOGIC_VECTOR(CINT_FIFO_SPACE_BAR, C_ENCODE_BAR_NUMBER) then

                   ChBuf_WrDin_i(C_CHBUF_PA_BIT_TOP downto C_CHBUF_PA_BIT_BOT)   <= DMA_PA_Var(C_EP_AWIDTH-1 downto 0);

                 elsif DMA_BAR_Number=CONV_STD_LOGIC_VECTOR(CINT_BRAM_SPACE_BAR, C_ENCODE_BAR_NUMBER) then

                   ChBuf_WrDin_i(C_CHBUF_MA_BIT_TOP downto C_CHBUF_MA_BIT_BOT)   <= DMA_PA_Var(C_PRAM_AWIDTH-1+2 downto 0);

                 elsif DMA_BAR_Number=CONV_STD_LOGIC_VECTOR(CINT_DDR_SPACE_BAR, C_ENCODE_BAR_NUMBER) then

                   ChBuf_WrDin_i(C_CHBUF_DDA_BIT_TOP downto C_CHBUF_DDA_BIT_BOT) <= DMA_PA_Var(C_DDR_IAWIDTH-1 downto 0);

                 else

                   ChBuf_WrDin_i(C_CHBUF_MA_BIT_TOP downto C_CHBUF_MA_BIT_BOT)   <= C_ALL_ZEROS(C_CHBUF_MA_BIT_TOP downto C_CHBUF_MA_BIT_BOT);

                 end if;

                 ChBuf_WrDin_i(C_CHBUF_TAG_BIT_TOP downto C_CHBUF_TAG_BIT_BOT)          <= Pkt_Tag;

                 ChBuf_WrDin_i(C_CHBUF_DMA_BAR_BIT_TOP downto C_CHBUF_DMA_BAR_BIT_BOT)  <= DMA_BAR_Number;

                 ChBuf_WrDin_i(C_CHBUF_FMT_BIT_TOP)                                     <= TLP_Has_Payload;

                 ChBuf_WrDin_i(C_CHBUF_FMT_BIT_BOT)                                     <= TLP_Hdr_is_4DW;

                 if DMA_BAR_Number=CONV_STD_LOGIC_VECTOR(CINT_FIFO_SPACE_BAR, C_ENCODE_BAR_NUMBER) then

                   ChBuf_WrDin_i(C_CHBUF_LENG_BIT_TOP downto C_CHBUF_LENG_BIT_BOT)        <= DMA_Body_Length(C_TLP_FLD_WIDTH_OF_LENG+1 downto 3) & '0';

                 else

                   ChBuf_WrDin_i(C_CHBUF_LENG_BIT_TOP downto C_CHBUF_LENG_BIT_BOT)        <= DMA_Body_Length(C_TLP_FLD_WIDTH_OF_LENG+1 downto 2);

                 end if;

                 ChBuf_WrDin_i(C_CHBUF_QVALID_BIT)                                      <= '1';

                 ChBuf_WrDin_i(C_CHBUF_AINC_BIT)                                        <= DMA_Addr_Inc;

                 ChBuf_WrDin_i(C_CHBUF_TC_BIT_TOP downto C_CHBUF_TC_BIT_BOT)            <= us_MWr_Param_Vec(2 downto 0);

                 ChBuf_WrDin_i(C_CHBUF_ATTR_BIT_TOP downto C_CHBUF_ATTR_BIT_BOT)        <= us_MWr_Param_Vec(5 downto 4);  -- C_RELAXED_ORDERING & C_NO_SNOOP;

            when dmaST_Tail =>

                 ChBuf_WrEn_i   <= '1';

                 ChBuf_WrDin_i   <= (OTHERS=>'0');   -- must be the first argument

                 ChBuf_WrDin_i(C_CHBUF_HA_BIT_TOP downto C_CHBUF_HA_BIT_BOT)     <= DMA_HA_Var;

                 if    DMA_BAR_Number=CONV_STD_LOGIC_VECTOR(CINT_FIFO_SPACE_BAR, C_ENCODE_BAR_NUMBER) then

                   ChBuf_WrDin_i(C_CHBUF_PA_BIT_TOP downto C_CHBUF_PA_BIT_BOT)   <= DMA_PA_Var(C_EP_AWIDTH-1 downto 0);

                 elsif DMA_BAR_Number=CONV_STD_LOGIC_VECTOR(CINT_BRAM_SPACE_BAR, C_ENCODE_BAR_NUMBER) then

                   ChBuf_WrDin_i(C_CHBUF_MA_BIT_TOP downto C_CHBUF_MA_BIT_BOT)   <= DMA_PA_Var(C_PRAM_AWIDTH-1+2 downto 0);

                 elsif DMA_BAR_Number=CONV_STD_LOGIC_VECTOR(CINT_DDR_SPACE_BAR, C_ENCODE_BAR_NUMBER) then

                   ChBuf_WrDin_i(C_CHBUF_DDA_BIT_TOP downto C_CHBUF_DDA_BIT_BOT) <= DMA_PA_Var(C_DDR_IAWIDTH-1 downto 0);

                 else

                   ChBuf_WrDin_i(C_CHBUF_MA_BIT_TOP downto C_CHBUF_MA_BIT_BOT)   <= C_ALL_ZEROS(C_CHBUF_MA_BIT_TOP downto C_CHBUF_MA_BIT_BOT);

                 end if;

                 ChBuf_WrDin_i(C_CHBUF_TAG_BIT_TOP downto C_CHBUF_TAG_BIT_BOT)          <= Pkt_Tag;

                 ChBuf_WrDin_i(C_CHBUF_DMA_BAR_BIT_TOP downto C_CHBUF_DMA_BAR_BIT_BOT)  <= DMA_BAR_Number;

                 ChBuf_WrDin_i(C_CHBUF_FMT_BIT_TOP)                                     <= TLP_Has_Payload;

                 ChBuf_WrDin_i(C_CHBUF_FMT_BIT_BOT)                                     <= TLP_Hdr_is_4DW;

                 if DMA_BAR_Number=CONV_STD_LOGIC_VECTOR(CINT_FIFO_SPACE_BAR, C_ENCODE_BAR_NUMBER) then

                   ChBuf_WrDin_i(C_CHBUF_LENG_BIT_TOP downto C_CHBUF_LENG_BIT_BOT)        <= DMA_Tail_Length(C_TLP_FLD_WIDTH_OF_LENG+1 downto 3) & '0';

                 else

                   ChBuf_WrDin_i(C_CHBUF_LENG_BIT_TOP downto C_CHBUF_LENG_BIT_BOT)        <= DMA_Tail_Length(C_TLP_FLD_WIDTH_OF_LENG+1 downto 2);

                 end if;

                 ChBuf_WrDin_i(C_CHBUF_QVALID_BIT)                                      <= '1';

                 ChBuf_WrDin_i(C_CHBUF_AINC_BIT)                                        <= DMA_Addr_Inc;

                 ChBuf_WrDin_i(C_CHBUF_TC_BIT_TOP downto C_CHBUF_TC_BIT_BOT)            <= us_MWr_Param_Vec(2 downto 0);

                 ChBuf_WrDin_i(C_CHBUF_ATTR_BIT_TOP downto C_CHBUF_ATTR_BIT_BOT)        <= us_MWr_Param_Vec(5 downto 4);  -- C_RELAXED_ORDERING & C_NO_SNOOP;

            when OTHERS =>

                 ChBuf_WrEn_i   <= '0';

                 ChBuf_WrDin_i  <= ChBuf_WrDin_i;

         end case;

      end if;

   end process;

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

-- Synchronous Latch: BDA_nAligned_i

--                  : Capture design defect

-- 

   Latch_BDA_nAligned:

   process ( dma_clk, dma_reset)

   begin

      if dma_reset = '1' then

         BDA_nAligned_i <= '0';

      elsif dma_clk'event and dma_clk = '1' then

         -- If the lowest 2 bits are not zero, error bit set accordingly,

         --   because the logic can not deal with this situation.

         --   can be removed.

         if DMA_BDA_fsm(1) ='1' or DMA_BDA_fsm(0) ='1' then

            BDA_nAligned_i <= '1';

         else

            BDA_nAligned_i <= BDA_nAligned_i;

         end if;

      end if;

   end process;

-- States synchronous: BusyDone_States

   Syn_BusyDone_States:

   process ( dma_clk, dma_reset)

   begin

      if dma_reset = '1' then

         BusyDone_State   <= FSM_Idle;

      elsif dma_clk'event and dma_clk = '1' then

         BusyDone_State   <= BusyDone_NextState;

      end if;

   end process;

-- Next States: BusyDone_State

   Comb_BusyDone_State:

   process (

             BusyDone_State

           , DMA_State

--           , Done_Condition_1

           , Done_Condition_2

           , Done_Condition_3

           , Done_Condition_4

           , Done_Condition_5

           )

   begin

     case BusyDone_State  is

       when FSM_Idle  =>

          if DMA_State = dmaST_Load_Param then

             BusyDone_NextState <= FSM_Busy1;

          else

             BusyDone_NextState <= FSM_Idle;

          end if;