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-- 

--
--  RX_LL
--
--
--
--  Description: The RX_LL module receives data from the Aurora Channel,
--               converts it to LocalLink and sends it to the user interface.
--               It also handles NFC and UFC messages.
--
--               This module supports 1 2-byte lane designs.
--
--

library IEEE;
use IEEE.STD_LOGIC_1164.all;

entity aurora_8b10b_v5_2_RX_LL is

    port (

    -- LocalLink PDU Interface

            RX_D             : out std_logic_vector(0 to 15);
            RX_REM           : out std_logic;
            RX_SRC_RDY_N     : out std_logic;
            RX_SOF_N         : out std_logic;
            RX_EOF_N         : out std_logic;

    -- Global Logic Interface

            START_RX         : in std_logic;

    -- Aurora Lane Interface

            RX_PAD           : in std_logic;
            RX_PE_DATA       : in std_logic_vector(0 to 15);
            RX_PE_DATA_V     : in std_logic;
            RX_SCP           : in std_logic;
            RX_ECP           : in std_logic;

    -- Error Interface

            FRAME_ERR      : out std_logic;

    -- System Interface

            USER_CLK         : in std_logic

         );

end aurora_8b10b_v5_2_RX_LL;

architecture MAPPED of aurora_8b10b_v5_2_RX_LL is

-- External Register Declarations --

    signal RX_D_Buffer             : std_logic_vector(0 to 15);
    signal RX_REM_Buffer           : std_logic;
    signal RX_SRC_RDY_N_Buffer     : std_logic;
    signal RX_SOF_N_Buffer         : std_logic;
    signal RX_EOF_N_Buffer         : std_logic;
    signal FRAME_ERR_Buffer      : std_logic;

-- Wire Declarations --

    signal start_rx_i          : std_logic;

-- Component Declarations --

    component aurora_8b10b_v5_2_RX_LL_PDU_DATAPATH

        port (

        -- Traffic Separator Interface

                PDU_DATA     : in std_logic_vector(0 to 15);
                PDU_DATA_V   : in std_logic;
                PDU_PAD      : in std_logic;
                PDU_SCP      : in std_logic;
                PDU_ECP      : in std_logic;

        -- LocalLink PDU Interface

                RX_D         : out std_logic_vector(0 to 15);
                RX_REM       : out std_logic;
                RX_SRC_RDY_N : out std_logic;
                RX_SOF_N     : out std_logic;
                RX_EOF_N     : out std_logic;

        -- Error Interface

                FRAME_ERR  : out std_logic;

        -- System Interface

                USER_CLK     : in std_logic;
                RESET        : in std_logic

             );

    end component;


begin

    RX_D             <= RX_D_Buffer;
    RX_REM           <= RX_REM_Buffer;
    RX_SRC_RDY_N     <= RX_SRC_RDY_N_Buffer;
    RX_SOF_N         <= RX_SOF_N_Buffer;
    RX_EOF_N         <= RX_EOF_N_Buffer;
    FRAME_ERR      <= FRAME_ERR_Buffer;

    start_rx_i       <= not START_RX;

-- Main Body of Code --

    -- Datapath for user PDUs --

    rx_ll_pdu_datapath_i : aurora_8b10b_v5_2_RX_LL_PDU_DATAPATH

        port map (

        -- Traffic Separator Interface

                    PDU_DATA     => RX_PE_DATA,
                    PDU_DATA_V   => RX_PE_DATA_V,
                    PDU_PAD      => RX_PAD,
                    PDU_SCP      => RX_SCP,
                    PDU_ECP      => RX_ECP,

        -- LocalLink PDU Interface

                    RX_D         => RX_D_Buffer,
                    RX_REM       => RX_REM_Buffer,
                    RX_SRC_RDY_N => RX_SRC_RDY_N_Buffer,
                    RX_SOF_N     => RX_SOF_N_Buffer,
                    RX_EOF_N     => RX_EOF_N_Buffer,

        -- Error Interface

                    FRAME_ERR  => FRAME_ERR_Buffer,

        -- System Interface

                    USER_CLK     => USER_CLK,
                    RESET        => start_rx_i

                 );


end MAPPED;
