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`timescale 1ns / 1ns

// -----------------------------------------------
// AXI slave network interface
//
// Converts incoming packets into AXI transactions
// -----------------------------------------------

module nios_system_altera_merlin_axi_slave_ni_19112_j24zl3q
#(
    // -----------------------------------------------
    // Packet format parameters
    // -----------------------------------------------


    parameter PKT_ORI_BURST_SIZE_H        = 120,
    parameter PKT_ORI_BURST_SIZE_L        = 118,
    parameter PKT_QOS_H                   = 117,
    parameter PKT_QOS_L                   = 114,
    parameter PKT_THREAD_ID_H             = 113,
    parameter PKT_THREAD_ID_L             = 112,
    parameter PKT_RESPONSE_STATUS_H       = 111, 
    parameter PKT_RESPONSE_STATUS_L       = 110,
    parameter PKT_BEGIN_BURST             = 109,
    parameter PKT_CACHE_H                 = 108,
    parameter PKT_CACHE_L                 = 105,
    parameter PKT_DATA_SIDEBAND_H         = 104,
    parameter PKT_DATA_SIDEBAND_L         = 97,
    parameter PKT_ADDR_SIDEBAND_H         = 96, 
    parameter PKT_ADDR_SIDEBAND_L         = 92,
    parameter PKT_BURST_TYPE_H            = 91,
    parameter PKT_BURST_TYPE_L            = 90,
    parameter PKT_PROTECTION_H            = 89, 
    parameter PKT_PROTECTION_L            = 87,
    parameter PKT_BURST_SIZE_H            = 86,
    parameter PKT_BURST_SIZE_L            = 84,
    parameter PKT_BURSTWRAP_H             = 83,
    parameter PKT_BURSTWRAP_L             = 81,
    parameter PKT_BYTE_CNT_H              = 80,
    parameter PKT_BYTE_CNT_L              = 78,
    parameter PKT_ADDR_H                  = 77,
    parameter PKT_ADDR_L                  = 46,
    parameter PKT_TRANS_EXCLUSIVE         = 45,
    parameter PKT_TRANS_LOCK              = 44,
    parameter PKT_TRANS_COMPRESSED_READ   = 43,
    parameter PKT_TRANS_POSTED            = 42,
    parameter PKT_TRANS_WRITE             = 41,
    parameter PKT_TRANS_READ              = 40,
    parameter PKT_DATA_H                  = 39,
    parameter PKT_DATA_L                  = 8,
    parameter PKT_BYTEEN_H                = 7,
    parameter PKT_BYTEEN_L                = 4,
    parameter PKT_SRC_ID_H                = 3,
    parameter PKT_SRC_ID_L                = 2,
    parameter PKT_DEST_ID_H               = 1,
    parameter PKT_DEST_ID_L               = 0,

    parameter PKT_DOMAIN_L                = 121,
    parameter PKT_DOMAIN_H                = 122, 
    parameter PKT_SNOOP_L                 = 123, 
    parameter PKT_SNOOP_H                 = 126,
    parameter PKT_BARRIER_L               = 127, 
    parameter PKT_BARRIER_H               = 128,
    parameter PKT_WUNIQUE                 = 129,
    parameter PKT_EOP_OOO                 = 130,
    parameter PKT_SOP_OOO                 = 131,

    // AXI5LITE new packet fields
    parameter PKT_AWAKEUP                 = 132,
    parameter PKT_ATRACE                  = 133,
    parameter PKT_TRACE                   = 134,   
    parameter PKT_POISON_L                = 135,
    parameter PKT_POISON_H                = 136,
    parameter PKT_DATACHK_L               = 137,
    parameter PKT_DATACHK_H               = 138,
    parameter PKT_ADDRCHK_L               = 139,
    parameter PKT_ADDRCHK_H               = 140,
    parameter PKT_SAI_L                   = 141,
    parameter PKT_SAI_H                   = 142,    
    parameter PKT_USER_DATA_L             = 143,
    parameter PKT_USER_DATA_H             = 144,

    // -----------------------------------------------
    // Component parameters
    // -----------------------------------------------
    parameter USE_MEMORY_BLOCKS           = 0,
    parameter EMPTY_LATENCY               = 1,
    parameter ST_DATA_W                   = 145,
    parameter ADDR_WIDTH                  = 32,
    parameter RDATA_WIDTH                 = 32,
    parameter WDATA_WIDTH                 = 32,
    parameter SAI_WIDTH                   = 4,
    parameter ADDRCHK_WIDTH               = 4,
    parameter ST_CHANNEL_W                = 1,
    parameter AXI_SLAVE_ID_W              = 4,  
    parameter ADDR_USER_WIDTH             = 5, 
    parameter USER_DATA_WIDTH             = 2, 
    parameter WRITE_ACCEPTANCE_CAPABILITY = 16,
    parameter READ_ACCEPTANCE_CAPABILITY  = 16,
    parameter PASS_ID_TO_SLAVE            = 0,
    parameter AXI_VERSION                 = "AXI3",
    parameter ENABLE_OOO                  = 0,
    parameter REORDER_BUFFER              = 0,
    parameter ROLE_BASED_USER             = 0,   

    parameter ACE_LITE_SUPPORT            = 0,
    parameter SYNC_RESET                  = 0,
    parameter USE_PKT_DATACHK             = 1,    // If USE_PKT_DATACHK=1, need to derive parity check (datachk) bits. If 0, drive datachk bits with 0.
    parameter USE_PKT_ADDRCHK             = 1,    // If USE_PKT_ADDRCHK=1, need to derive parity check (addrchk) bits. If 0, drive addrchk bits with 0.    
    // -----------------------------------------------
    // Derived parameters 
    // -----------------------------------------------
    parameter RESPONSE_W                  = PKT_RESPONSE_STATUS_H - PKT_RESPONSE_STATUS_L + 1,
    parameter AXI_WSTRB_W                 = PKT_BYTEEN_H - PKT_BYTEEN_L + 1,
    parameter PKT_DATA_W                  = PKT_DATA_H - PKT_DATA_L + 1,
    parameter NUMSYMBOLS                  = PKT_DATA_W / 8,

    //DATA_USER_WIDTH: w/ruser is not supported in AXI3. set it to default 1 and axi trasnlator will terminate this connection appropriately
    parameter DATA_USER_WIDTH             = 8,
    parameter RESP_USER_WIDTH             = 1,
    parameter AXI_LOCK_WIDTH              = (AXI_VERSION == "AXI3") ? 2:1,
    parameter AXI_BURST_LENGTH_WIDTH      = (AXI_VERSION == "AXI3") ? 4:8,
    parameter  PKT_POISON_W               = PKT_POISON_H - PKT_POISON_L + 1,   
    parameter  DATACHK_WIDTH              = PKT_DATA_W / 8,
    parameter  POISON_WIDTH               = (PKT_DATA_W + 64 -1) / 64, // ceil(PKT_DATA_W/64) workaround 
    parameter  PADDING_ZERO               = (ADDRCHK_WIDTH*8) - ADDR_WIDTH,
    parameter  PKT_SAI_W                  = PKT_SAI_H - PKT_SAI_L + 1,
    parameter  PARITY_ADDR_WIDTH          = PADDING_ZERO + ADDR_WIDTH,
    parameter  SKIP_USER_ADDRCHK_CAL      = (ADDRCHK_WIDTH == 1 && ADDR_WIDTH > 8),
    parameter  PADDING_ADDR_MERLIN        = (ADDR_WIDTH-1) - (PKT_ADDR_H- PKT_ADDR_L),
    parameter  PADDING_ADDR               = (PKT_ADDR_H > PKT_ADDR_L+ADDR_WIDTH-1) ? (PKT_ADDR_H- PKT_ADDR_L) - (ADDR_WIDTH -1) : 1

)
(
    input aclk,
    input aresetn,
    output awakeup,

    // AXI write channels
    output reg       [AXI_SLAVE_ID_W-1:0]         awid,
    output           [ADDR_WIDTH-1:0]             awaddr,
    output reg       [AXI_BURST_LENGTH_WIDTH-1:0] awlen, 
    output           [2:0]                        awsize,
    output           [1:0]                        awburst,
    output           [AXI_LOCK_WIDTH-1:0]         awlock,
    output           [3:0]                        awcache,
    output           [2:0]                        awprot,
    output           [3:0]                        awqos,
    output           [3:0]                        awregion,
    output                                        awvalid,
    output           [ADDR_USER_WIDTH-1:0]        awuser,
    output                                        awtrace,                                     
    input                                         awready,

    output reg       [AXI_SLAVE_ID_W-1:0]         wid,
    output           [PKT_DATA_W-1:0]             wdata,
    output           [AXI_WSTRB_W-1:0]            wstrb,
    output           [DATACHK_WIDTH-1:0]          wdatachk,
    output           [POISON_WIDTH-1:0]           wpoison,
    output                                        wtrace,    
    output           [DATA_USER_WIDTH-1:0]        wuser,
    output                                        wlast,
    output                                        wvalid,
    input                                         wready,

    input            [AXI_SLAVE_ID_W-1:0]         bid,
    input            [1:0]                        bresp,
    input            [RESP_USER_WIDTH-1:0]        buser,
    input                                         bvalid,
    input                                         btrace,
    output                                        bready,

    // AXI read channels
    output reg       [AXI_SLAVE_ID_W-1:0]     arid,
    output           [ADDR_WIDTH-1:0]         araddr,
    output           [AXI_BURST_LENGTH_WIDTH-1:0] arlen,
    output           [2:0]                    arsize,
    output           [1:0]                    arburst,
    output           [AXI_LOCK_WIDTH-1:0]     arlock,
    output           [3:0]                    arcache,
    output           [2:0]                    arprot,
    output           [3:0]                    arqos,
    output           [3:0]                    arregion,       
    output                                    arvalid,
    output                                    artrace,
    output           [ADDR_USER_WIDTH-1:0]    aruser,
    input                                     arready,

    input            [AXI_SLAVE_ID_W-1:0]     rid,
    input            [PKT_DATA_W-1:0]         rdata,
    input            [RESPONSE_W-1:0]         rresp,
    input            [DATA_USER_WIDTH-1:0]    ruser,
    input            [DATACHK_WIDTH-1:0]      rdatachk,
    input            [POISON_WIDTH-1:0]       rpoison,
    input                                     rtrace,    
    input                                     rlast,
    input                                     rvalid,
    output                                    rready, 
    
    //AXI role base used signals
    output [ADDRCHK_WIDTH-1:0]                  awuser_addrchk,
    output [SAI_WIDTH-1:0]                      awuser_sai,
    output [SAI_WIDTH-1:0]                      aruser_sai,
    output [ADDRCHK_WIDTH-1:0]                  aruser_addrchk,
    output [DATACHK_WIDTH-1:0]                  wuser_datachk,
    output [USER_DATA_WIDTH-1:0]                wuser_data,
    output [POISON_WIDTH-1:0]                   wuser_poison,
    input  [DATACHK_WIDTH-1:0]                  ruser_datachk,
    input  [USER_DATA_WIDTH-1:0]                ruser_data,
    input  [POISON_WIDTH-1:0]                   ruser_poison,

    // ACE-Lite Signals
    output [1:0]                              ardomain, 
    output [3:0]                              arsnoop, 
    output [1:0]                              arbar,
 
    output [1:0]                              awdomain, 
    output [2:0]                              awsnoop, 
    output [1:0]                              awbar, 
    output                                    awunique, 

    // Av-st read sink command packet interface
    output                                    read_cp_ready,
    input                                     read_cp_valid,
    input             [ST_DATA_W-1:0]         read_cp_data,
    input             [ST_CHANNEL_W-1:0]      read_cp_channel,
    input                                     read_cp_startofpacket,
    input                                     read_cp_endofpacket,

    // Av-st read source response packet interface
    input                                     read_rp_ready,
    output                                    read_rp_valid,
    output reg         [ST_DATA_W-1:0]        read_rp_data,
    output                                    read_rp_startofpacket,
    output                                    read_rp_endofpacket,

    // Av-st write sink command packet interface
    output reg                                write_cp_ready,
    input                                     write_cp_valid,
    input             [ST_DATA_W-1:0]         write_cp_data,
    input             [ST_CHANNEL_W-1:0]      write_cp_channel,
    input                                     write_cp_startofpacket,
    input                                     write_cp_endofpacket,

    // Av-st write source response packet interface
    input                                     write_rp_ready,
    output                                    write_rp_valid,
    output reg         [ST_DATA_W-1:0]        write_rp_data,
    output reg                                write_rp_startofpacket,
    output reg                                write_rp_endofpacket
);

    
    // --------------------------------------------------
    // Bunch-o-local parameters
    // --------------------------------------------------
    localparam  MASTER_ID_W         = PKT_SRC_ID_H - PKT_SRC_ID_L + 1;
    localparam  SLAVE_ID_W          = PKT_DEST_ID_H - PKT_DEST_ID_L + 1;
    localparam  THREAD_ID_W         = PKT_THREAD_ID_H - PKT_THREAD_ID_L + 1;
    localparam  BURST_SIZE_W        = PKT_BURST_SIZE_H - PKT_BURST_SIZE_L + 1;
    localparam  BURST_TYPE_W        = 2;
    localparam  BYTECOUNT_W         = PKT_BYTE_CNT_H - PKT_BYTE_CNT_L + 1;
    localparam  BURSTWRAP_W         = PKT_BURSTWRAP_H - PKT_BURSTWRAP_L + 1;
    localparam  PROTECTION_W        = PKT_PROTECTION_H - PKT_PROTECTION_L + 1;
    localparam  CACHE_W             = PKT_CACHE_H - PKT_CACHE_L + 1;
    localparam  BYTEEN_W            = PKT_BYTEEN_H - PKT_BYTEEN_L + 1;
    localparam  USER_W              = PKT_ADDR_SIDEBAND_H - PKT_ADDR_SIDEBAND_L + 1;
    localparam  DOMAIN_VALUE        = 3;    // Non-sharable
    localparam  BARRIER_VALUE       = 2;    // Normal access, ignoring barriers
    localparam  SNOOP_VALUE         = 0;    // No snoop
    localparam  WUNIQUE_VALUE       = 0;   
    localparam  MATCH_ID_W          = (((PKT_DEST_ID_H - PKT_DEST_ID_L + 1) + (PKT_THREAD_ID_H - PKT_THREAD_ID_L + 1)) - AXI_SLAVE_ID_W );
    localparam  INTERNAL_ID_W       = ((MASTER_ID_W + THREAD_ID_W) > AXI_SLAVE_ID_W ? (MASTER_ID_W + THREAD_ID_W ): AXI_SLAVE_ID_W );
    localparam  PKT_DATACHK_W       = PKT_DATACHK_H - PKT_DATACHK_L + 1;
    localparam META_DATA_W          = ST_DATA_W - AXI_SLAVE_ID_W ;
        localparam ST_PIPELINE_DATA_W   =  POISON_WIDTH + DATACHK_WIDTH + USER_DATA_WIDTH + DATA_USER_WIDTH + AXI_SLAVE_ID_W + RESPONSE_W + PKT_DATA_W + 1; // added user_data
        localparam ST_PIPELINE_WR_DATA_W   = DATA_USER_WIDTH + AXI_SLAVE_ID_W + 2; 
    // --------------------------------------------------
    // Ceil(log2()) function
    // --------------------------------------------------
    function integer log2ceil;
        input reg[63:0] val;
        reg [63:0] i;

        begin
            i = 1;
            log2ceil = 0;

            while (i < val) begin
                log2ceil = log2ceil + 1;
                i = i << 1;
            end
        end
    endfunction   
    
    // --------------------------------------------------
    // calcParity: calculates byte-level parity signal 
    // --------------------------------------------------
    function reg [DATACHK_WIDTH-1:0] calcParity (
        input [PKT_DATA_W-1:0] data
     );
        for (int i=0; i<DATACHK_WIDTH; i++)
            calcParity[i] = ~(^ data[i*8 +:8]);
    endfunction
    // --------------------------------------------------
    // addrcalcParity: calculates byte-level parity signal 
    // --------------------------------------------------
    function reg [ADDRCHK_WIDTH-1:0] addrcalcParity (
        input [PARITY_ADDR_WIDTH-1:0] addr
     );
        for (int i=0; i<ADDRCHK_WIDTH; i++)
            addrcalcParity[i] = ~(^ addr[i*8 +:8]);
    endfunction
    // --------------------------------------------------
    // addrcalc_incorrectParity: calculates byte-level incorrect parity signal 
    // --------------------------------------------------
    function reg [ADDRCHK_WIDTH-1:0] addrcalc_incorrectParity (
        input [PARITY_ADDR_WIDTH-1:0] addr
     );
        reg [ADDRCHK_WIDTH-1:0]addrcalcParity;

        for (int i=0; i<ADDRCHK_WIDTH; i++)
            addrcalcParity[i] = ~(^ addr[i*8 +:8]);
            addrcalc_incorrectParity = ~addrcalcParity; 
    endfunction
    // ------------------------------------------------
    // Signals
    // ------------------------------------------------
    wire [PKT_DATA_W-1:0]     write_cmd_data;
    wire [AXI_WSTRB_W-1:0]    write_cmd_byteen;
    reg  [ADDR_WIDTH-1:0]     write_cmd_addr;
    reg  [BYTECOUNT_W-1:0]    write_cmd_bytecount;
    wire [MASTER_ID_W-1:0]    write_cmd_mid;
    wire [THREAD_ID_W-1:0]    write_cmd_threadid;
    wire [1:0]                write_cmd_lock;
    reg  [BURST_TYPE_W-1:0]   write_cmd_bursttype;
    wire [BURST_SIZE_W-1:0]   write_cmd_size;
    wire [PROTECTION_W-1:0]   write_cmd_protection;
    wire [CACHE_W-1:0]        write_cmd_cache;
    wire [USER_W-1:0]         write_cmd_user;
    wire [ADDRCHK_WIDTH-1:0]  write_cmd_awuser_addrchk;
    wire [DATACHK_WIDTH-1:0]  write_cmd_wuser_datachk;
    wire [USER_DATA_WIDTH-1:0]write_cmd_wuser_data;
    wire [POISON_WIDTH-1:0]   write_cmd_wuser_poison;
    wire [SAI_WIDTH-1:0]      write_cmd_awuser_sai;
    wire [DATACHK_WIDTH-1:0]  write_cmd_wdatachk;
    wire                      write_cmd_wtrace;
    wire [POISON_WIDTH-1:0]   write_cmd_wpoison;
    wire                      write_cmd_awakeup;
    wire                      write_cmd_awtrace;        
    wire                      write_cmd_artrace; 
    
    wire [DATA_USER_WIDTH-1:0] write_cmd_wuser;
    wire [3:0]                 write_cmd_qos;   
  
    reg                       internal_write_cp_endofburst;
    reg                       internal_read_cp_startofburst;
    reg                       internal_read_cp_endofburst;  
  
    wire [ADDR_WIDTH-1:0]     read_cmd_addr;
    wire [ADDR_WIDTH-1:0]     read_cmd_addr_aligned;
    wire [BURST_SIZE_W-1:0]   read_cmd_size;
    reg  [BYTECOUNT_W-1:0]    read_cmd_bytecount;
    wire [MASTER_ID_W-1:0]    read_cmd_mid;
    wire [THREAD_ID_W-1:0]    read_cmd_threadid;
    wire [1:0]                read_cmd_lock;
    wire [PROTECTION_W-1:0]   read_cmd_protection;
    wire [CACHE_W-1:0]        read_cmd_cache;
    reg  [BURST_TYPE_W-1:0]   read_cmd_bursttype;
    wire [USER_W-1:0]         read_cmd_user;
    wire                      read_cmd_compressed;
    wire [ADDRCHK_WIDTH-1:0]  read_cmd_aruser_addrchk;
    wire [SAI_WIDTH-1:0]      read_cmd_aruser_sai;
    wire read_cmd_artrace;    

    wire [3:0]                read_cmd_snoop;
    wire [1:0]                read_cmd_domain;
    wire [1:0]                read_cmd_bar;

    wire [2:0]                write_cmd_snoop;
    wire [1:0]                write_cmd_domain;
    wire [1:0]                write_cmd_bar;
    wire                      write_cmd_unique;
  
    wire                      awvalid_suppress; 
    wire                      wvalid_suppress;
  
    wire [ST_DATA_W:0]        write_rsp_fifo_indata; // one extra bit to store write_cp_endofpacket
    wire [ST_DATA_W:0]        write_rsp_fifo_outdata;
    wire                      write_rsp_fifo_invalid;
    wire                      write_rsp_fifo_inready;
    wire                      write_rsp_fifo_outvalid;
    wire                      write_rsp_fifo_outready;
    wire [ST_DATA_W:0]        read_rsp_fifo_indata;  // one extra bit to store read_cp_endofpacket
    wire [ST_DATA_W:0]        read_rsp_fifo_outdata;
    wire                      read_rsp_fifo_invalid;
    wire                      read_rsp_fifo_inready;
    wire                      read_rsp_fifo_outvalid;
    wire                      read_rsp_fifo_outready;  
    wire                      write_rsp_fifo_posted;
  
  
    wire areset = ~aresetn;  // altera_sc_fifo has an active high reset
  
    reg                       read_sop_enable;
    reg                       address_taken;
    reg                       data_taken;
    reg  [BYTECOUNT_W-1:0]    minimum_bytecount;
    wire [31:0]               awlen_wire;  
    wire [31:0]               arlen_wire;  
    reg                       write_rsp_fifo_sop; // create a start of first subburst to clear the storage of the bresp merging mechanism
    wire                      write_rsp_fifo_eop;
    reg [RESPONSE_W-1:0]      bresp_merged;  // merges the response according to the following SLVERR->DECERR->OKAY->EXOKAY
    reg [RESPONSE_W-1:0]      previous_response_in;
    reg                       reset_merged_output; 
    wire                      rvalid_uncompressor;
 
    reg [INTERNAL_ID_W -1 :0 ] awid_internal;  
    reg [INTERNAL_ID_W -1 :0 ] wid_internal ;  
    reg [INTERNAL_ID_W -1 :0 ] arid_internal;  
 
    wire [(SLAVE_ID_W + THREAD_ID_W -1):0] write_rp_data_bid_internal; 
    wire [(SLAVE_ID_W + THREAD_ID_W -1):0] read_rp_data_rid_internal ;
    //OOO Milestone 1-3
 
    wire [META_DATA_W -1 :0]                    meta_read_data_resp_mem_in;
    wire [META_DATA_W + AXI_SLAVE_ID_W : 0]     read_rsp_mem_indata;
    wire [META_DATA_W + AXI_SLAVE_ID_W : 0]     read_rsp_mem_outdata;

    wire [META_DATA_W -1 :0]                    meta_write_data_resp_mem_in;
    wire [META_DATA_W + AXI_SLAVE_ID_W : 0]     write_rsp_mem_indata;
    wire [META_DATA_W + AXI_SLAVE_ID_W : 0]     write_rsp_mem_outdata;
    
    wire [ST_PIPELINE_DATA_W-1:0]p1_data_in;
    wire p1_valid_in,p1_bvalid_in;
    wire p1_ready_in,p1_bready_in;
    wire [ST_PIPELINE_DATA_W-1:0]p1_data_out;
    wire p1_valid_out,p1_bvalid_out;
    wire p1_ready_out,p1_bready_out;
    wire p1_btrace;
    wire [ST_PIPELINE_WR_DATA_W-1 : 0] p1_bdata_in,p1_bdata_out;
    
    wire [PKT_DATA_W-1:0]p1_rdata;
    wire [RESPONSE_W-1:0] p1_rresp,p1_bresp;
    wire [DATA_USER_WIDTH-1:0]p1_ruser;
    wire [RESP_USER_WIDTH-1:0]p1_buser;
    wire [AXI_SLAVE_ID_W-1:0]p1_rid,p1_bid;
    wire [AXI_SLAVE_ID_W-1:0]rid_resp_mem,bid_resp_mem;    
    wire p1_rlast,p1_rtrace;
    wire [DATACHK_WIDTH-1:0] p1_rdatachk;
    wire [POISON_WIDTH-1:0] p1_rpoison;
    wire [USER_DATA_WIDTH-1:0] p1_ruser_data;
    wire rvalid_resp_mem,bvalid_resp_mem;

    wire read_rp_ready_temp,write_rp_ready_temp;
    wire read_rp_valid_temp,write_rp_valid_temp;
    reg [ST_DATA_W-1:0] read_rp_data_temp,write_rp_data_temp;
    wire read_rp_startofpacket_temp,write_rp_startofpacket_temp;
    wire read_rp_endofpacket_temp,write_rp_endofpacket_temp;

    typedef enum bit [1:0] 
    {
      FIXED       = 2'b00,
      INCR        = 2'b01,
      WRAP        = 2'b10,
      RESERVED    = 2'b11
    } AxiBurstType;


    // Generation of internal reset synchronization
   reg internal_sclr;
   generate if (SYNC_RESET == 1) begin : rst_syncronizer
      always @ (posedge aclk) begin
         internal_sclr <= areset;
      end
   end
   endgenerate
   
    //------------------------------------
    // Write Command Packet -> AXI Transaction
    //------------------------------------

    // DATA PATH START

    assign write_cmd_data        = write_cp_data[PKT_DATA_H : PKT_DATA_L];
    assign write_cmd_byteen      = write_cp_data[PKT_BYTEEN_H : PKT_BYTEEN_L];
    assign write_cmd_mid         = write_cp_data[PKT_SRC_ID_H : PKT_SRC_ID_L];
    assign write_cmd_size        = write_cp_data[PKT_BURST_SIZE_H : PKT_BURST_SIZE_L];
    assign write_cmd_lock        = { 1'b0, write_cp_data[PKT_TRANS_EXCLUSIVE] };
    generate
      if (PKT_ADDR_H > PKT_ADDR_L + ADDR_WIDTH -1) begin
           assign write_cmd_addr   = write_cp_data[PKT_ADDR_L + ADDR_WIDTH -1 : PKT_ADDR_L];
      end
      else if (PKT_ADDR_H < PKT_ADDR_L + ADDR_WIDTH -1) begin
           assign write_cmd_addr   = {{PADDING_ADDR_MERLIN{1'b0}},write_cp_data[PKT_ADDR_H : PKT_ADDR_L]};
      end
      else begin 
           assign write_cmd_addr   = write_cp_data[PKT_ADDR_H : PKT_ADDR_L];
      end
    endgenerate
    assign write_cmd_bytecount   = write_cp_data[PKT_BYTE_CNT_H : PKT_BYTE_CNT_L]; 
    assign write_cmd_threadid    = write_cp_data[PKT_THREAD_ID_H : PKT_THREAD_ID_L];
    assign write_cmd_protection  = write_cp_data[PKT_PROTECTION_H : PKT_PROTECTION_L];
    assign write_cmd_bursttype   = write_cp_data[PKT_BURST_TYPE_H : PKT_BURST_TYPE_L];
    assign write_cmd_user        = write_cp_data[PKT_ADDR_SIDEBAND_H : PKT_ADDR_SIDEBAND_L];
    assign awlen_wire            = (write_cmd_bytecount >> log2ceil(PKT_DATA_W / 8)) - 1;
    //this condition is added if master does not have port will point to single bit in that case width miss match quartus warnings to avoid
    generate
       if (ROLE_BASED_USER) begin
           wire aw_parity_status;
       
           if(POISON_WIDTH == PKT_POISON_W)
               assign write_cmd_wuser_poison  = write_cp_data[PKT_POISON_H : PKT_POISON_L ];
           else
               assign write_cmd_wuser_poison  = {{(POISON_WIDTH - PKT_POISON_W){1'b0}} , write_cp_data[PKT_POISON_H : PKT_POISON_L ]};
               
           if(SAI_WIDTH == PKT_SAI_W)
               assign write_cmd_awuser_sai    = write_cp_data [PKT_SAI_H : PKT_SAI_L];
           else
               assign write_cmd_awuser_sai    = {{(SAI_WIDTH - PKT_SAI_W){1'b0}}, write_cp_data[PKT_SAI_H:PKT_SAI_L ]};
               
           assign aw_parity_status = write_cp_data[PKT_ADDRCHK_H];
       
           if(USE_PKT_ADDRCHK)
               assign write_cmd_awuser_addrchk = write_cp_data[PKT_ADDRCHK_H-1 :PKT_ADDRCHK_L];
           else begin
               if(SKIP_USER_ADDRCHK_CAL) begin
                    assign write_cmd_awuser_addrchk = 1'b0;
               end 
               else begin
                    assign write_cmd_awuser_addrchk = aw_parity_status ?  addrcalc_incorrectParity({{PADDING_ZERO{1'b0}},write_cmd_addr}) : addrcalcParity({{PADDING_ZERO{1'b0}},write_cmd_addr});
               end
           end
           
           if(USE_PKT_DATACHK)
               assign write_cmd_wuser_datachk = write_cp_data[PKT_DATACHK_H : PKT_DATACHK_L]; 
           else
               assign write_cmd_wuser_datachk = '0;
           
           assign write_cmd_wuser_data = write_cp_data[PKT_USER_DATA_H : PKT_USER_DATA_L]; 
           
       end
    endgenerate

    // ACE_Lite Signals
    // Note: If slave is ACE-Lite, cache value is modified by the NI so that
    // its consistent with system domain.
    // pass through ace_lite signals
       assign write_cmd_domain         = write_cp_data[PKT_DOMAIN_H : PKT_DOMAIN_L];
       assign write_cmd_snoop          = write_cp_data[PKT_SNOOP_H-1 : PKT_SNOOP_L];   // 3 bits
       assign write_cmd_bar            = write_cp_data[PKT_BARRIER_H : PKT_BARRIER_L];
       assign write_cmd_unique         = write_cp_data[PKT_WUNIQUE];
       assign write_cmd_cache          = write_cp_data[PKT_CACHE_H : PKT_CACHE_L];
    

    // assign all signals to pass through to AXI AW* and W* channels, except for last, valid and ready 
    always @* begin
        awid_internal       = {INTERNAL_ID_W{1'b0}};
        awid_internal       = PASS_ID_TO_SLAVE ? {write_cmd_mid, write_cmd_threadid} : {INTERNAL_ID_W{1'b0}} ;
    end
    assign awaddr        = write_cmd_addr;
    assign awlen         = awlen_wire[AXI_BURST_LENGTH_WIDTH-1:0];
    assign awsize        = write_cmd_size[2:0];
    assign awcache       = write_cmd_cache;
    assign awprot        = write_cmd_protection;
    assign awlock        = write_cmd_lock[AXI_LOCK_WIDTH-1:0];
    assign awuser        = write_cmd_user;
    assign awburst       = write_cmd_bursttype;
    generate 
      if (ENABLE_OOO == 0) begin
         assign awid     = awid_internal[AXI_SLAVE_ID_W -1 :0];
      end
    endgenerate      
    
    generate
      if (ROLE_BASED_USER) begin
         assign awuser_addrchk = write_cmd_awuser_addrchk;
         assign awuser_sai     = write_cmd_awuser_sai;
      end
    endgenerate

    always @* begin
        wid_internal     = {INTERNAL_ID_W{1'b0}};
        wid_internal     = PASS_ID_TO_SLAVE ? {write_cmd_mid, write_cmd_threadid} : {INTERNAL_ID_W{1'b0}};
    end   
    assign wdata         = write_cmd_data;
    assign wstrb         = write_cmd_byteen;
    assign wlast         = internal_write_cp_endofburst;
    assign wid           = wid_internal[AXI_SLAVE_ID_W -1 :0];
    generate
      if (ROLE_BASED_USER) begin
        assign wuser_datachk = write_cmd_wuser_datachk;
        assign wuser_poison  = write_cmd_wuser_poison;
        assign wuser_data    = write_cmd_wuser_data;
      end
    endgenerate
    // might need to add AXI5 handling condition ???
     generate
         if (AXI_VERSION == "AXI4") begin
             assign write_cmd_wuser  = write_cp_data[PKT_DATA_SIDEBAND_H : PKT_DATA_SIDEBAND_L];
             assign write_cmd_qos    = write_cp_data[PKT_QOS_H : PKT_QOS_L];
             assign wuser            = write_cmd_wuser;
             assign awqos            = write_cmd_qos;
             assign awregion         = 4'b0;
         end else begin
             assign wuser            = '0;
             assign awqos            = '0;
             assign awregion         = '0;   
         end
     endgenerate     
     

    reg [RESPONSE_W-1:0]  previous_response;

    //----------------------------------
    // Write Response Status Merging
    // 
    // Write responses need to be merged when there are subbursts.
    // Each subburst will have a response, which will need to be
    // combined into one write response status.
    //
    // The merged response must follow the following precedence: 
    // DECERR -> SLVERR -> OKAY -> EXOKAY (11 -> 10 -> 00 -> 01)
    //
    //  bresp       00  01  11  10
    //  previous 
    //  00          00  00  11  10
    //  01          00  01  11  10
    //  11          11  11  11  11
    //  10          10  10  11  10
    //-----------------------------------

    function reg [1:0] merged_response;
        input [3:0] previous_and_current_responses;
 
        begin
            case (previous_and_current_responses)
   
                4'b1101: merged_response = 2'b11;
                4'b1100: merged_response = 2'b11;
                4'b1111: merged_response = 2'b11;
                4'b1110: merged_response = 2'b11;

                4'b1001: merged_response = 2'b10;
                4'b1000: merged_response = 2'b10;
                4'b1011: merged_response = 2'b11;
                4'b1010: merged_response = 2'b10; 
   
                4'b0001: merged_response = 2'b00;
                4'b0000: merged_response = 2'b00;
                4'b0011: merged_response = 2'b11;
                4'b0010: merged_response = 2'b10;
   
                4'b0101: merged_response = 2'b01;
                4'b0100: merged_response = 2'b00;
                4'b0111: merged_response = 2'b11;
                4'b0110: merged_response = 2'b10;
   
                default: merged_response = 2'b01;
            endcase
        end
    endfunction   

    generate
    if (SYNC_RESET == 0) begin : async_rst0
       always_ff @(posedge aclk, negedge aresetn) begin
           if (!aresetn) begin
               write_rsp_fifo_sop  <= 1'b1;
           end 
           else begin
               if (write_rsp_fifo_outready) begin
                   write_rsp_fifo_sop <= 1'b0;
                   if (write_rsp_fifo_eop)
                       write_rsp_fifo_sop <= 1'b1;
               end
           end
       end
    end // async_rst0

    else begin : sync_rst0
       always_ff @(posedge aclk) begin
           if (internal_sclr) begin
               write_rsp_fifo_sop  <= 1'b1;
           end 
           else begin
               if (write_rsp_fifo_outready) begin
                   write_rsp_fifo_sop <= 1'b0;
                   if (write_rsp_fifo_eop)
                       write_rsp_fifo_sop <= 1'b1;
               end
           end
       end
    end // sync_rst0
    endgenerate

    always_comb begin
        reset_merged_output = write_rsp_fifo_sop && bvalid_resp_mem;
        previous_response_in = reset_merged_output ? p1_bresp : previous_response;
        bresp_merged = merged_response( {previous_response_in, p1_bresp} );
    end

    generate
    if (SYNC_RESET == 0) begin : async_rst1 
       always_ff @(posedge aclk or negedge aresetn) begin
           if (!aresetn) begin 
               previous_response <= 2'b01;
           end
           else begin
               if (bvalid) begin
                   previous_response <= bresp_merged;
               end
           end
       end
    end // async_rst1
   
    else begin : sync_rst1
       always_ff @(posedge aclk ) begin
           if (internal_sclr) begin 
               previous_response <= 2'b01;
           end
           else begin
               if (bvalid) begin
                   previous_response <= bresp_merged;
               end
           end
       end
    end // sync_rst1
    endgenerate
    //------------------------------------
    // Write response packet formation
    //------------------------------------
    generate
      if(ENABLE_OOO == 0)begin
        assign write_rsp_fifo_indata = {write_cp_endofpacket, write_cp_data};
      end
    endgenerate  
   //to deal with case where MATCH_ID_W padding is required/not required
        generate
           if (( SLAVE_ID_W + THREAD_ID_W ) > AXI_SLAVE_ID_W ) begin    
                  assign write_rp_data_bid_internal  = {{MATCH_ID_W{1'b0}}, p1_bid};
           end else begin
                  assign write_rp_data_bid_internal  = p1_bid[SLAVE_ID_W + THREAD_ID_W -1:0];
           end
   endgenerate 

    always_comb
    begin
        write_rp_data_temp = write_rsp_fifo_outdata[ST_DATA_W-1:0];
        write_rp_data_temp[PKT_DEST_ID_H:PKT_DEST_ID_L]                         = write_rsp_fifo_outdata[PKT_SRC_ID_H:PKT_SRC_ID_L];
        write_rp_data_temp[PKT_SRC_ID_H:PKT_SRC_ID_L]                           = write_rsp_fifo_outdata[PKT_DEST_ID_H:PKT_DEST_ID_L];
        write_rp_data_temp[PKT_ORI_BURST_SIZE_H:PKT_ORI_BURST_SIZE_L]           = write_rsp_fifo_outdata[PKT_ORI_BURST_SIZE_H:PKT_ORI_BURST_SIZE_L];
        if (PASS_ID_TO_SLAVE) begin
           { write_rp_data_temp[PKT_DEST_ID_H:PKT_DEST_ID_L], write_rp_data_temp[PKT_THREAD_ID_H:PKT_THREAD_ID_L] }  = write_rp_data_bid_internal;
        end
           if (AXI_VERSION == "AXI4") begin
              write_rp_data_temp[PKT_DATA_SIDEBAND_H : PKT_DATA_SIDEBAND_L]           = p1_buser;
            end
            else begin
              write_rp_data_temp[PKT_DATA_SIDEBAND_H : PKT_DATA_SIDEBAND_L]           = '0;
            end        
        if(ENABLE_OOO ==1 && REORDER_BUFFER == 1)begin    //write responses are passed through to ROB
           write_rp_data_temp[PKT_RESPONSE_STATUS_H:PKT_RESPONSE_STATUS_L] = p1_bresp;
        end 
        else begin
           write_rp_data_temp[PKT_RESPONSE_STATUS_H:PKT_RESPONSE_STATUS_L] = bresp_merged;
        end
    end


    //-----------------------------------------
    // Write response merging
    //
    // Write responses are only one cycle long, so always
    // assert startofpacket and endofpacket.
    //-----------------------------------------
    assign write_rsp_fifo_eop     = write_rsp_fifo_outdata[ST_DATA_W];
    generate
    if(ENABLE_OOO ==1 && REORDER_BUFFER == 1) begin   //write responses are passed through to ROB. sop/eop is assigned based on output of response memory.
        assign write_rp_startofpacket_temp = write_rsp_fifo_outdata[PKT_SOP_OOO];
        assign write_rp_endofpacket_temp   = write_rsp_fifo_outdata[PKT_EOP_OOO];
    end else begin
        assign write_rp_startofpacket_temp = 1'b1;
        assign write_rp_endofpacket_temp   = 1'b1;
    end
    endgenerate
    
    // DATA PATH END
    // CONTROL LOGIC START


    //------------------------------------
    // Control logic for internal startofpacket and endofpacket generation.
    //
    // The need for internal sop / eop: some masters can produce bursts of 
    // length > 16 while AXI slaves can only accept a maximum of 16. As a result, 
    // the burst adapter will split the burst (within the same packet).
    //
    // For example, a burst of 18 from a master will be converted into 2 bursts of 
    // 16+2 by the burst adapter in the SAME packet. So, the bytecount generated in 
    // the packet (assuming a 32bit data width) is <sop>64,60,56,..,12,8,4,8,4<eop>. 
    // The last "8,4" represents the 2nd burst with length of 2.
    // 
    // We need to convert this into <sop>64,60,56,..,12,8,4<eop><sop>8,4<eop> internally.
    //------------------------------------

    wire [31:0] minimum_bytecount_wire = PKT_DATA_W / 8; // to solve qis warning
    assign minimum_bytecount = minimum_bytecount_wire[BYTECOUNT_W-1:0];

    assign internal_write_cp_endofburst = (write_cmd_bytecount == minimum_bytecount);

    //------------------------------------
    // Control logic for awvalid, wvalid, write_cp_ready suppression
    // awvalid and wvalid suprression:  At the first transaction within a burst, a merlin packet will contain both address and data with valid asserted.
    //                                  the slave may accept the data and address by asserting wready / awready respectively. If awready is asserted before wready is asserted, the NI
    //                                  will need to suppress awvalid into the slave until wready is asserted, in order to avoid taking in unused addresses. 
    //                                  This is also true if wready is asserted, wvalid will be suppressed until awready is asserted.
    //                                  For subsequent transaction within a burst, awvalid should continue to be suppressed because only data contains valid information.
    //                                  No suppression is needed for wvalid.
    //  write_cp_ready assertion:       At first burst transaction, write_cp_ready is asserted when both awready and wready is asserted. on subsequent transaction, write_cp_ready
    //                                  is asserted depending on when wready is asserted.
    //  backpressure mechanism:         write_cp_ready will be deasserted whenever write rsp fifo is full. this will cause write_cp_valid to be held high, and my cause the slave to
    //                                  continuously taking in new write commands errornously, if the write acceptance capability of the slave is > fifo depth.
    //                                  Hence awvalid and wvalid needs to be held low to prevent this from happening.
    //------------------------------------
    assign  write_cp_ready = (awready && wready && write_rsp_fifo_inready) || (address_taken && wready) || (data_taken && awready);
    
    assign  awvalid = write_cp_valid && !address_taken && write_rsp_fifo_inready;  
    assign  wvalid  = write_cp_valid && !data_taken && write_rsp_fifo_inready;     

    generate
    if (SYNC_RESET == 0) begin : async_rst2

       always_ff @(posedge aclk or negedge aresetn) begin
           if (!aresetn) begin
               address_taken   <= '0;
           end
           else begin
               if (awvalid && awready)
                   address_taken   <= '1;
               if (write_cp_valid && write_cp_ready && internal_write_cp_endofburst) // address is considered taken until end of packet
                   address_taken   <= '0;
           end        
       end
    end // async_rst2

    else begin : sync_rst2

       always_ff @(posedge aclk ) begin
           if (internal_sclr) begin
               address_taken   <= '0;
           end
           else begin
               if (awvalid && awready)
                   address_taken   <= '1;
               if (write_cp_valid && write_cp_ready && internal_write_cp_endofburst) // address is considered taken until end of packet
                   address_taken   <= '0;
           end        
       end
    end // sync_rst2
    endgenerate

    generate
    if (SYNC_RESET == 0) begin : async_rst3
       always_ff @(posedge aclk or negedge aresetn) begin
           if  (!aresetn) begin
               data_taken  <= '0;
           end
           else begin
               if (wvalid && wready)
                   data_taken  <= '1;
               if (write_cp_valid && write_cp_ready)
                   data_taken  <= '0;
           end
       end
    end // async_rst3

    else begin : sync_rst3

       always_ff @(posedge aclk ) begin
           if  (internal_sclr) begin
               data_taken  <= '0;
           end
           else begin
               if (wvalid && wready)
                   data_taken  <= '1;
               if (write_cp_valid && write_cp_ready)
                   data_taken  <= '0;
           end
       end
    end // sync_rst3
    endgenerate
    //------------------------------------
    // bready and bvalid
    //
    // We need to assert bready when a posted write transaction occurs. This is because the network
    // will not send a ready signal through write_rp_ready, but the slave will need bready to 
    // deassert bvalid and continue to the next response.
    //------------------------------------
    assign write_rsp_fifo_posted  = write_rsp_fifo_outdata[PKT_TRANS_POSTED];
    // the last OR statement is for multiple nonposted subburst in a packet, for the non-final subburst, 
    // we need to fake a bready response to prevent the bvalid from being asserted forever and hang
    // for the last bvalid in a packet, it will wait for the write_rp_ready, which signals the system is ready to accept a write response
    generate
       if (USE_MEMORY_BLOCKS) begin : Using_M20k_with_2_clk_latency
           assign p1_bready_out                 = (write_rp_ready_temp && write_rsp_fifo_outvalid) || (bvalid_resp_mem && write_rsp_fifo_posted && write_rsp_fifo_outvalid) ||  bvalid_resp_mem && write_rsp_fifo_outvalid && !write_rsp_fifo_posted && !write_rsp_fifo_eop;  
       end else begin : Using_ALM_memory_with_1_clk_latency
           assign p1_bready_out                 = write_rp_ready_temp || (bvalid_resp_mem && write_rsp_fifo_posted) ||  bvalid_resp_mem && write_rsp_fifo_outvalid && !write_rsp_fifo_posted && !write_rsp_fifo_eop;  
       end
    endgenerate

     // only send a write response when there is a valid non-posted fifo entry
     // also only send on the endofpacket
     generate
     if(ENABLE_OOO ==1 && REORDER_BUFFER == 1)begin    //write responses are passed through to ROB
         assign write_rp_valid_temp         = bvalid_resp_mem && write_rsp_fifo_outvalid && !write_rsp_fifo_posted ;  
     end else begin 
         assign write_rp_valid_temp         = bvalid_resp_mem && write_rsp_fifo_outvalid && !write_rsp_fifo_posted && write_rsp_fifo_eop;
      end
    endgenerate
    //assign write_rp_valid_temp         = bvalid_resp_mem && write_rsp_fifo_outvalid && !write_rsp_fifo_posted;

    // write to the response fifo at the end of each sub-burst
    assign write_rsp_fifo_invalid  = write_cp_ready && write_cp_valid && internal_write_cp_endofburst;

    // only pop entries off the fifo when the write response is accepted (or is posted)
    //assign write_rsp_fifo_outready = p1_bvalid && (write_rp_ready_temp || write_rsp_fifo_posted);
    assign write_rsp_fifo_outready = bvalid_resp_mem && p1_bready_out;

    // CONTROL LOGIC END
    
    //------------------------------------
    // Read Transaction
    //------------------------------------

    // assign command fields
    generate 
        if (PKT_ADDR_H > PKT_ADDR_L + ADDR_WIDTH -1) begin
             assign read_cmd_addr        = read_cp_data[PKT_ADDR_L + ADDR_WIDTH -1 : PKT_ADDR_L];
        end
        else if (PKT_ADDR_H < PKT_ADDR_L + ADDR_WIDTH -1) begin
             assign read_cmd_addr        = {{PADDING_ADDR_MERLIN{1'b0}},read_cp_data[PKT_ADDR_H : PKT_ADDR_L]};
        end
        else begin 
             assign read_cmd_addr        = read_cp_data[PKT_ADDR_H : PKT_ADDR_L];
        end
    endgenerate
    assign read_cmd_mid             = read_cp_data[PKT_SRC_ID_H :PKT_SRC_ID_L];
    assign read_cmd_bytecount       = read_cp_data[PKT_BYTE_CNT_H :PKT_BYTE_CNT_L];    
    assign read_cmd_size            = read_cp_data[PKT_BURST_SIZE_H:PKT_BURST_SIZE_L];
    assign read_cmd_threadid        = read_cp_data[PKT_THREAD_ID_H:PKT_THREAD_ID_L];
    assign read_cmd_protection      = read_cp_data[PKT_PROTECTION_H:PKT_PROTECTION_L];
    assign read_cmd_bursttype       = read_cp_data[PKT_BURST_TYPE_H:PKT_BURST_TYPE_L];
    assign read_cmd_user            = read_cp_data[PKT_ADDR_SIDEBAND_H : PKT_ADDR_SIDEBAND_L];
    assign read_cmd_compressed      = read_cp_data[PKT_TRANS_COMPRESSED_READ];
    assign read_cmd_lock            = { 1'b0, read_cp_data[PKT_TRANS_EXCLUSIVE] };
    assign arlen_wire               = read_cmd_compressed ? (read_cmd_bytecount >> log2ceil(PKT_DATA_W / 8)) - 1 : '0;

    generate
      if(ROLE_BASED_USER) begin
        wire ar_parity_status;
            
        assign ar_parity_status = read_cp_data[PKT_ADDRCHK_H];
        if(USE_PKT_ADDRCHK)
            assign read_cmd_aruser_addrchk = read_cp_data[PKT_ADDRCHK_H-1 : PKT_ADDRCHK_L];
        else begin
            if(SKIP_USER_ADDRCHK_CAL) begin
                assign read_cmd_aruser_addrchk = 1'b0;    
            end
            else begin
                assign read_cmd_aruser_addrchk = ar_parity_status ? addrcalc_incorrectParity ({{PADDING_ZERO{1'b0}},read_cmd_addr}) : addrcalcParity({{PADDING_ZERO{1'b0}},read_cmd_addr});    
            end
        end
        if(SAI_WIDTH == PKT_SAI_W)
            assign read_cmd_aruser_sai           = read_cp_data [PKT_SAI_H : PKT_SAI_L];
        else
            assign read_cmd_aruser_sai           = {{(SAI_WIDTH - PKT_SAI_W){1'b0}}, read_cp_data[PKT_SAI_H:PKT_SAI_L ]};
      end else begin
            assign read_cmd_aruser_addrchk       = '0;
            assign read_cmd_aruser_sai           = '0;
      end
    endgenerate
    // ACE_Lite Signals
    // Note: If slave is ACE-Lite, cache value is modified by the NI so that
    // its consistent with system domain.
    // pass through ace_lite signals
       assign read_cmd_domain          = read_cp_data[PKT_DOMAIN_H : PKT_DOMAIN_L];    
       assign read_cmd_snoop           = read_cp_data[PKT_SNOOP_H : PKT_SNOOP_L];      // 4 bits
       assign read_cmd_bar             = read_cp_data[PKT_BARRIER_H : PKT_BARRIER_L];
       assign read_cmd_cache           = read_cp_data[PKT_CACHE_H:PKT_CACHE_L];

    // assign all signals to pass through to AR* channels, except for last, valid and ready
    always @* begin
        arid_internal        = {INTERNAL_ID_W{1'b0}};
        arid_internal        = PASS_ID_TO_SLAVE ? {read_cmd_mid, read_cmd_threadid} : {INTERNAL_ID_W{1'b0}};
    end   
    assign araddr       = read_cmd_addr;
    assign arlen        = arlen_wire[AXI_BURST_LENGTH_WIDTH-1:0];         
    assign arsize       = read_cmd_size[2:0];
    assign arlock       = read_cmd_lock[AXI_LOCK_WIDTH-1:0];
    assign arcache      = read_cmd_cache;
    assign arprot       = read_cmd_protection;
    assign aruser       = read_cmd_user;
    assign arburst      = read_cmd_bursttype;
    assign aruser_addrchk = read_cmd_aruser_addrchk;
    assign aruser_sai   = read_cmd_aruser_sai;

    assign ardomain     = read_cmd_domain;
    assign arsnoop      = read_cmd_snoop;
    assign arbar        = read_cmd_bar;

    assign awdomain     = write_cmd_domain;
    assign awsnoop      = write_cmd_snoop;
    assign awbar        = write_cmd_bar;
    assign awunique     = write_cmd_unique;
    generate
      if (ENABLE_OOO == 0) begin
          assign arid         = arid_internal[AXI_SLAVE_ID_W -1:0];
      end
    endgenerate

    generate
        if (AXI_VERSION == "AXI4") begin
            wire [3:0]  read_cmd_qos;
            assign read_cmd_qos = read_cp_data[PKT_QOS_H : PKT_QOS_L];
            assign arqos        = read_cmd_qos;
            assign arregion     = 4'b0;
        end else if (AXI_VERSION == "AXI5") begin
            assign arqos        = read_cp_data[PKT_QOS_H : PKT_QOS_L];
            assign arregion     = '0;
        end else begin
            assign arqos        = '0;
            assign arregion     = '0;
        end
    endgenerate
    // ----------------------------------------
    // Align the input address to burst uncompressor, as 
    // we want the return addresses are ligned
    // ----------------------------------------
    reg [ADDR_WIDTH + (BURSTWRAP_W-1) + BURST_SIZE_W + BURST_TYPE_W - 1:0]     address_for_alignment;
    reg [ADDR_WIDTH + log2ceil(NUMSYMBOLS)-1:0] address_after_aligned;

    assign address_for_alignment    = {read_cmd_addr, read_cmd_size};
    assign read_cmd_addr_aligned    = address_after_aligned[ADDR_WIDTH-1:0];
    
    altera_merlin_address_alignment
        #(
          .ADDR_W            (ADDR_WIDTH),
          .BURSTWRAP_W       (BURSTWRAP_W),
          .INCREMENT_ADDRESS (0),
          .NUMSYMBOLS        (NUMSYMBOLS),
          .SIZE_W            (BURST_SIZE_W),
          .SYNC_RESET        (SYNC_RESET)
          ) check_and_align_address_to_size
            (
             .clk(aclk),
             .reset(aresetn),
             .in_data(address_for_alignment),
             .out_data(address_after_aligned),
             .in_valid(),
             .in_sop(),
             .in_eop(),
             .out_ready()
             );
    //------------------------------------
    // Response packet formation
    //------------------------------------
    reg [ST_DATA_W-1:0]           read_cp_data_for_fifo;
    // Replace address in read command to aligned address
    always_comb
        begin
            read_cp_data_for_fifo                           = read_cp_data;
            if (PKT_ADDR_H > PKT_ADDR_L + ADDR_WIDTH -1) begin
                read_cp_data_for_fifo[PKT_ADDR_H : PKT_ADDR_L ] = {{PADDING_ADDR{1'b0}},read_cmd_addr_aligned};
            end
            else if (PKT_ADDR_H < PKT_ADDR_L + ADDR_WIDTH -1) begin
                read_cp_data_for_fifo[PKT_ADDR_H : PKT_ADDR_L ] = read_cmd_addr_aligned[PKT_ADDR_H-PKT_ADDR_L:0];
            end
            else begin 
                read_cp_data_for_fifo[PKT_ADDR_H : PKT_ADDR_L ] = read_cmd_addr_aligned;
            end
        end
    
    // Puss it back to fifo
    generate
      if (ENABLE_OOO == 0) begin
          assign read_rsp_fifo_indata = {read_cp_endofpacket, read_cp_data_for_fifo}; 
      end
    endgenerate
  

    wire                        uncompressor_outvalid;
    wire                        uncompressor_inready;
    wire                        read_rsp_fifo_outdata_eop;
    wire                        read_rsp_fifo_outdata_is_comp;
    reg                         read_rsp_fifo_outdata_sop;
    wire [BURSTWRAP_W-1 : 0]    read_rsp_fifo_outdata_burstwrap;
    wire [ADDR_WIDTH-1 : 0]     read_rsp_fifo_outdata_addr;
    wire [BYTECOUNT_W-1: 0]     read_rsp_fifo_outdata_bytecount;
    wire [BURST_SIZE_W-1 : 0]   read_rsp_fifo_outdata_burstsize;
    wire                        uncompressor_is_comp;
    wire [BURSTWRAP_W-1 : 0]    uncompressor_burstwrap;
    wire [ADDR_WIDTH-1 : 0]     uncompressor_addr;
    wire [BYTECOUNT_W-1: 0]     uncompressor_bytecount;   
    wire [BURST_SIZE_W-1:0]     uncompressor_burstsize;

//to deal with case where MATCH_ID_W padding is required/not required
    generate
        if (( SLAVE_ID_W + THREAD_ID_W ) > AXI_SLAVE_ID_W ) begin
              assign read_rp_data_rid_internal = {{MATCH_ID_W{1'b0}},p1_rid};
        end else begin
              assign read_rp_data_rid_internal       = p1_rid[SLAVE_ID_W + THREAD_ID_W -1:0];
        end
    endgenerate

    always_comb
        begin
            read_rp_data_temp = read_rsp_fifo_outdata[ST_DATA_W-1:0];
            read_rp_data_temp[PKT_DATA_H : PKT_DATA_L]           = p1_rdata;
            if (PKT_ADDR_H > PKT_ADDR_L + ADDR_WIDTH -1) begin 
                read_rp_data_temp[PKT_ADDR_H : PKT_ADDR_L ] = {{PADDING_ADDR{1'b0}},uncompressor_addr};
            end
            else if (PKT_ADDR_H < PKT_ADDR_L + ADDR_WIDTH -1) begin
                read_rp_data_temp[PKT_ADDR_H : PKT_ADDR_L ] = uncompressor_addr[PKT_ADDR_H-PKT_ADDR_L:0];
            end
            else begin 
                read_rp_data_temp[PKT_ADDR_H : PKT_ADDR_L ] = uncompressor_addr;
            end
            read_rp_data_temp[PKT_BYTE_CNT_H : PKT_BYTE_CNT_L]   = uncompressor_bytecount;
            read_rp_data_temp[PKT_TRANS_COMPRESSED_READ]         = uncompressor_is_comp;
            read_rp_data_temp[PKT_BURSTWRAP_H:PKT_BURSTWRAP_L]   = uncompressor_burstwrap;
            read_rp_data_temp[PKT_BURST_SIZE_H:PKT_BURST_SIZE_L] = uncompressor_burstsize;
            read_rp_data_temp[PKT_DEST_ID_H:PKT_DEST_ID_L]       = read_rsp_fifo_outdata[PKT_SRC_ID_H:PKT_SRC_ID_L];
            read_rp_data_temp[PKT_SRC_ID_H:PKT_SRC_ID_L]         = read_rsp_fifo_outdata[PKT_DEST_ID_H:PKT_DEST_ID_L];
            read_rp_data_temp[PKT_ORI_BURST_SIZE_H:PKT_ORI_BURST_SIZE_L] = read_rsp_fifo_outdata[PKT_ORI_BURST_SIZE_H:PKT_ORI_BURST_SIZE_L];
            read_rp_data_temp[PKT_RESPONSE_STATUS_H:PKT_RESPONSE_STATUS_L] = p1_rresp;

            if (PASS_ID_TO_SLAVE) begin
                { read_rp_data_temp[PKT_DEST_ID_H:PKT_DEST_ID_L], read_rp_data_temp[PKT_THREAD_ID_H:PKT_THREAD_ID_L] } = read_rp_data_rid_internal;
            end


               if (AXI_VERSION == "AXI4") begin
                   read_rp_data_temp[PKT_DATA_SIDEBAND_H : PKT_DATA_SIDEBAND_L]           = p1_ruser;
               end
               else begin
                   read_rp_data_temp[PKT_DATA_SIDEBAND_H : PKT_DATA_SIDEBAND_L]           = '0;
               end            
               if (ROLE_BASED_USER) begin
                  read_rp_data_temp[PKT_POISON_H:PKT_POISON_L]                    = p1_rpoison; // rpoison = 0
                  read_rp_data_temp[PKT_USER_DATA_H:PKT_USER_DATA_L]              = p1_ruser_data;
                  if(USE_PKT_DATACHK)
                      read_rp_data_temp[PKT_DATACHK_H:PKT_DATACHK_L]              = p1_rdatachk;
                  else             
                      read_rp_data_temp[PKT_DATACHK_H:PKT_DATACHK_L]              = calcParity(p1_rdata);
               end
        end 
// start of packet assertion should only happen at the start of burst and should not be asserted at the start of sub-burst

    generate 
    if (USE_MEMORY_BLOCKS) begin : Using_M20k_change1
    if (SYNC_RESET == 0) begin : async_rst4_m20k
       always_ff @ (posedge aclk or negedge aresetn)
       if  (!aresetn)
           read_rsp_fifo_outdata_sop <= 1'b1;
       else
       begin
           if (read_rp_ready_temp & rvalid_resp_mem & (!read_rp_endofpacket))
               read_rsp_fifo_outdata_sop <= 1'b0;
           if (read_rp_ready_temp & rvalid_resp_mem & read_rp_endofpacket)
               read_rsp_fifo_outdata_sop <= 1'b1;
       end   
    end // async_rst4_m20k

    else begin : sync_rst4_m20k_ch
       always_ff @ (posedge aclk )
       if  (internal_sclr)
           read_rsp_fifo_outdata_sop <= 1'b1;
       else
       begin
           if (read_rp_ready_temp & rvalid_resp_mem & (!read_rp_endofpacket))
               read_rsp_fifo_outdata_sop <= 1'b0;
           if (read_rp_ready_temp & rvalid_resp_mem & read_rp_endofpacket)
               read_rsp_fifo_outdata_sop <= 1'b1;
       end 
    end // sync_rst4_m20k
    end else begin : Using_ALM_memory_change1
        if (SYNC_RESET == 0) begin : async_rst4
       always_ff @ (posedge aclk or negedge aresetn)
       if  (!aresetn)
           read_rsp_fifo_outdata_sop <= 1'b1;
       else
       begin
           if (read_rp_ready_temp & rvalid_resp_mem)
               read_rsp_fifo_outdata_sop <= 1'b0;
           if (read_rp_ready_temp & rvalid_resp_mem & read_rp_endofpacket)
               read_rsp_fifo_outdata_sop <= 1'b1;
       end   
    end // async_rst4

    else begin : sync_rst4
       always_ff @ (posedge aclk )
       if  (internal_sclr)
           read_rsp_fifo_outdata_sop <= 1'b1;
       else
       begin
           if (read_rp_ready_temp & rvalid_resp_mem)
               read_rsp_fifo_outdata_sop <= 1'b0;
           if (read_rp_ready_temp & rvalid_resp_mem & read_rp_endofpacket)
               read_rsp_fifo_outdata_sop <= 1'b1;
       end 
    end // sync_rst4
    end
    endgenerate

    // CONTROL PATH START

    assign read_cp_ready    = arready && read_rsp_fifo_inready; //backpressure when the fifo is full
   generate
      assign arvalid = read_cp_valid && read_rsp_fifo_inready; //its the job of the network to hold the valid signal, until the slave asserts the arready.      
      if (USE_MEMORY_BLOCKS) begin : Using_M20k_change2
          assign p1_ready_out           = read_rp_ready_temp && read_rsp_fifo_outvalid;
      end else begin : Using_ALM_memory_chnage2
          assign p1_ready_out           = read_rp_ready_temp;
      end
       assign read_rp_valid_temp    = rvalid_resp_mem && uncompressor_outvalid;
   endgenerate     
    // control signals for fifo
    assign read_rsp_fifo_invalid    = read_cp_ready && read_cp_valid;    // pulse valid into FIFO  
    assign read_rsp_fifo_outready   = uncompressor_inready;  // pop off entry on last transfer in burst

    // CONTROL PATH END

    assign read_rsp_fifo_outdata_eop        = read_rsp_fifo_outdata[ST_DATA_W];
    assign read_rsp_fifo_outdata_burstwrap  = read_rsp_fifo_outdata[PKT_BURSTWRAP_H:PKT_BURSTWRAP_L];
   generate 
       if (PKT_ADDR_H > PKT_ADDR_L + ADDR_WIDTH-1) begin
            assign read_rsp_fifo_outdata_addr       = read_rsp_fifo_outdata[PKT_ADDR_L+ADDR_WIDTH-1:PKT_ADDR_L];         
       end
       else if (PKT_ADDR_H < PKT_ADDR_L + ADDR_WIDTH-1) begin
            assign read_rsp_fifo_outdata_addr       = {{PADDING_ADDR_MERLIN{1'b0}},read_rsp_fifo_outdata[PKT_ADDR_H:PKT_ADDR_L]};         
       end
       else begin 
            assign read_rsp_fifo_outdata_addr       = read_rsp_fifo_outdata[PKT_ADDR_H:PKT_ADDR_L];         
       end
   endgenerate
    assign read_rsp_fifo_outdata_bytecount  = read_rsp_fifo_outdata[PKT_BYTE_CNT_H:PKT_BYTE_CNT_L]; 
    assign read_rsp_fifo_outdata_is_comp    = read_rsp_fifo_outdata[PKT_TRANS_COMPRESSED_READ];
    assign read_rsp_fifo_outdata_burstsize  = read_rsp_fifo_outdata[PKT_BURST_SIZE_H:PKT_BURST_SIZE_L];

    //---------------------------------------------
    // Storing source and destination ID into FIFO.
    // Previously, the implementation was to transmit the source ID as the AWID, 
    // but problems occur when the slave can reorder the transaction.
    //
    // For slaves that reorder, we need to transmit a dummy "0" AWID out so that 
    // transactions will not be reordered. 
    // A FIFO buffers the ID to be popped out when required.
    //---------------------------------------------

   generate
       if (USE_MEMORY_BLOCKS) begin : Using_M20k_rvalid
           assign rvalid_uncompressor = (rvalid_resp_mem && read_rsp_fifo_outvalid);
       end else begin : Using_ALM_memory_rvalid
           assign rvalid_uncompressor = rvalid_resp_mem;
       end    
   endgenerate

    altera_merlin_burst_uncompressor #(
        .ADDR_W         (ADDR_WIDTH),
        .BURSTWRAP_W    (BURSTWRAP_W),
        .BYTE_CNT_W     (BYTECOUNT_W),
        .PKT_SYMBOLS    (NUMSYMBOLS),
        .BURST_SIZE_W   (BURST_SIZE_W),
        .SYNC_RESET     (SYNC_RESET)
    ) read_burst_uncompressor (
        .clk                    (aclk),
        .reset                  (areset),
        .sink_startofpacket     (read_rsp_fifo_outdata_sop),
        .sink_endofpacket       (read_rsp_fifo_outdata_eop),
        .sink_valid             (rvalid_uncompressor),
        .sink_ready             (uncompressor_inready),
        .sink_addr              (read_rsp_fifo_outdata_addr),
        .sink_burstwrap         (read_rsp_fifo_outdata_burstwrap),
        .sink_byte_cnt          (read_rsp_fifo_outdata_bytecount),
        .sink_is_compressed     (read_rsp_fifo_outdata_is_comp),
        .sink_burstsize         (read_rsp_fifo_outdata_burstsize),

        .source_startofpacket   (read_rp_startofpacket_temp),
        .source_endofpacket     (read_rp_endofpacket_temp),
        .source_valid           (uncompressor_outvalid),
        .source_ready           (read_rp_ready_temp),
        .source_addr            (uncompressor_addr),
        .source_burstwrap       (uncompressor_burstwrap),
        .source_byte_cnt        (uncompressor_bytecount),
        .source_is_compressed   (uncompressor_is_comp),
        .source_burstsize       (uncompressor_burstsize)
    );

 generate 
   if (ENABLE_OOO == 0) begin

    //altera_avalon_sc_fifo #(
    nios_system_altera_merlin_axi_slave_ni_altera_avalon_sc_fifo_19112_nwtghbq #(
        .SYMBOLS_PER_BEAT    (1),
        .BITS_PER_SYMBOL     (ST_DATA_W + 1),
        .FIFO_DEPTH          (WRITE_ACCEPTANCE_CAPABILITY),
        .CHANNEL_WIDTH       (0),
        .ERROR_WIDTH         (0),
        .USE_PACKETS         (0),
        .USE_FILL_LEVEL      (0),
        .EMPTY_LATENCY       (EMPTY_LATENCY),
        .USE_MEMORY_BLOCKS   (USE_MEMORY_BLOCKS), 
        .USE_STORE_FORWARD   (0),
        .USE_ALMOST_FULL_IF  (0),
        .USE_ALMOST_EMPTY_IF (0),
        .MEM_TYPE            ("AUTO"),
        .SYNC_RESET          (SYNC_RESET)
    ) write_rsp_fifo (
        .clk               (aclk),                                 // clk.clk
        .reset             (areset),                               // clk_reset.reset
        .in_data           (write_rsp_fifo_indata),                // posted,src id, dest id
        .in_valid          (write_rsp_fifo_invalid),               // takes in a valid pulse when both arredy and rready is asserted
        .in_ready          (write_rsp_fifo_inready),               // FIFO will never be full
        .out_data          (write_rsp_fifo_outdata),               // When receive, response. take out ID and pass to BID
        .out_valid         (write_rsp_fifo_outvalid),              // 
        .out_ready         (write_rsp_fifo_outready)               // 
    );         

    //altera_avalon_sc_fifo #(
    nios_system_altera_merlin_axi_slave_ni_altera_avalon_sc_fifo_19112_nwtghbq #(
        .SYMBOLS_PER_BEAT    (1),
        .BITS_PER_SYMBOL     (ST_DATA_W + 1),  //one extra bite for read_cp_endofpacket
        .FIFO_DEPTH          (READ_ACCEPTANCE_CAPABILITY),
        .CHANNEL_WIDTH       (0),
        .ERROR_WIDTH         (0),
        .USE_PACKETS         (0),
        .USE_FILL_LEVEL      (0),
        .EMPTY_LATENCY       (EMPTY_LATENCY),
        .USE_MEMORY_BLOCKS   (USE_MEMORY_BLOCKS),
        .USE_STORE_FORWARD   (0),
        .USE_ALMOST_FULL_IF  (0),
        .USE_ALMOST_EMPTY_IF (0),
        .MEM_TYPE            ("AUTO"),
        .SYNC_RESET          (SYNC_RESET)
    ) read_rsp_fifo (
        .clk               (aclk),                                 // clk.clk
        .reset             (areset),                               // clk_reset.reset
        .in_data           (read_rsp_fifo_indata),                 // posted, src id, dest id
        .in_valid          (read_rsp_fifo_invalid),                // takes in a valid pulse when both arredy and rready is asserted
        .in_ready          (read_rsp_fifo_inready),                // FIFO will never be full
        .out_data          (read_rsp_fifo_outdata),                // When receive, response. take out ID and pass to BID
        .out_valid         (read_rsp_fifo_outvalid),               //
        .out_ready         (read_rsp_fifo_outready)                //
    );      
   end
   else begin   
     //N2W milestone 1-3 achive shift register logic is implemented instead of response FIFO
      assign meta_write_data_resp_mem_in  =  write_cp_data[ST_DATA_W-1: PKT_ADDR_L];                               
      assign write_rsp_mem_indata         = {write_cp_endofpacket,meta_write_data_resp_mem_in , awid_internal[AXI_SLAVE_ID_W -1:0]}; 
//      only way to add ID field without changing frame format is keep ID at MSB
//      - EOP, ID, meta_data-(except data and BE)
      assign write_rsp_fifo_outdata[ST_DATA_W]               = write_rsp_mem_outdata[META_DATA_W + AXI_SLAVE_ID_W] ; // EOP
      assign write_rsp_fifo_outdata[ST_DATA_W-1:PKT_ADDR_L]  = write_rsp_mem_outdata[META_DATA_W + AXI_SLAVE_ID_W-1:AXI_SLAVE_ID_W] ; // rest frame till ADDR_L
     
      wr_response_mem_j24zl3q #(
       .ST_DATA_W    (META_DATA_W + AXI_SLAVE_ID_W +1), // adding LSB arid info
       .ID_W         (AXI_SLAVE_ID_W),
       .PIPELINE_OUT (1),
       .PIPELINE_CMP (0)
      ) write_response_memory (
          .clk              (aclk),                                 
          .rst              (areset),                               
          .in_data          (write_rsp_mem_indata),                 
          .in_valid         (write_rsp_fifo_invalid),                
          .in_ready         (write_rsp_fifo_inready),                
          .out_data         (write_rsp_mem_outdata),                
          .out_valid        (write_rsp_fifo_outvalid),               
          .out_ready        (p1_bready_out), //in
     
          //.cmd_valid      (awvalid),
          .cmd_id           (awid),
          .cmd_ready        ('1),
          
          .rsp_valid        (bvalid_resp_mem),
          .rsp_id           (bid_resp_mem)
      ); 
     
                                       
      assign meta_read_data_resp_mem_in  =   read_cp_data_for_fifo [ST_DATA_W-1: PKT_ADDR_L];                               
      assign read_rsp_mem_indata         =  {read_cp_endofpacket, meta_read_data_resp_mem_in , arid_internal[AXI_SLAVE_ID_W -1:0]}; 
      //      only way to add ID field without changing frame format is keep ID at MSB
//      - EOP, ID, meta_data-(except data and BE)
      assign read_rsp_fifo_outdata[ST_DATA_W]               = read_rsp_mem_outdata[META_DATA_W + AXI_SLAVE_ID_W] ; // EOP
      assign read_rsp_fifo_outdata[ST_DATA_W-1:PKT_ADDR_L]  = read_rsp_mem_outdata[META_DATA_W + AXI_SLAVE_ID_W-1:AXI_SLAVE_ID_W] ; // rest frame till ADDR_L
     
      rd_response_mem_j24zl3q #(
       .ST_DATA_W    (META_DATA_W + AXI_SLAVE_ID_W +1), // adding LSB arid info
       .ID_W         (AXI_SLAVE_ID_W),
       .PIPELINE_OUT (1),
       .PIPELINE_CMP (0)
      ) read_response_memory (
          .clk              (aclk),                                 
          .rst              (areset),                               
          .in_data          (read_rsp_mem_indata),                 
          .in_valid         (read_rsp_fifo_invalid),                
          .in_ready         (read_rsp_fifo_inready),                
          .out_data         (read_rsp_mem_outdata),                
          .out_valid        (read_rsp_fifo_outvalid),               
          .out_ready        (p1_rlast && p1_ready_out),
     
          .cmd_id           (arid),
          .cmd_ready        (arready),
          
          .rsp_valid        (rvalid_resp_mem),
          .rsp_id           (rid_resp_mem)
      ); 
   end
endgenerate  

//response memory logic depth reduction- adding one stage pipeline in-order to sync between resposne_mem and slave response data
generate 
   if (ENABLE_OOO == 1) begin
     assign p1_data_in  = {rlast,ruser_data,ruser_datachk,ruser_poison,ruser,rresp,rid,rdata};
     assign p1_valid_in = rvalid;
     assign rready      = p1_ready_in;
     assign p1_rdata    = p1_data_out[0 +: PKT_DATA_W];
     assign p1_rid      = p1_data_out[PKT_DATA_W +: AXI_SLAVE_ID_W];
     assign p1_rresp    = p1_data_out[PKT_DATA_W+AXI_SLAVE_ID_W +: RESPONSE_W];
     assign p1_ruser    = p1_data_out[PKT_DATA_W+AXI_SLAVE_ID_W+RESPONSE_W +: DATA_USER_WIDTH];
     assign p1_rpoison    = p1_data_out[PKT_DATA_W+AXI_SLAVE_ID_W+RESPONSE_W+DATA_USER_WIDTH +: POISON_WIDTH];     
     assign p1_rdatachk   = p1_data_out[PKT_DATA_W+AXI_SLAVE_ID_W+RESPONSE_W+DATA_USER_WIDTH+POISON_WIDTH +: DATACHK_WIDTH];
     assign p1_ruser_data = p1_data_out[PKT_DATA_W+AXI_SLAVE_ID_W+RESPONSE_W+DATA_USER_WIDTH+POISON_WIDTH+DATACHK_WIDTH +: USER_DATA_WIDTH];
     assign p1_rlast    = p1_data_out[ST_PIPELINE_DATA_W-1];
    

    
    nios_system_altera_merlin_axi_slave_ni_altera_avalon_st_pipeline_stage_19112_tzr3uqi #(
      .SYMBOLS_PER_BEAT (1),
      .BITS_PER_SYMBOL  (ST_PIPELINE_DATA_W),
      .USE_PACKETS      (0),
      .USE_EMPTY        (0),
      .PIPELINE_READY   (0),
      .SYNC_RESET       (SYNC_RESET),
      .CHANNEL_WIDTH    (0),
      .ERROR_WIDTH      (0)
    ) altera_avalon_st_pipeline_stage_rd (
        .clk               (aclk),                                 
        .reset             (areset),                               
        .in_data           (p1_data_in),                
        .in_valid          (p1_valid_in),               
        .in_ready          (p1_ready_in),               
        .out_data          (p1_data_out),               
        .out_valid         (p1_valid_out),              
        .out_ready         (p1_ready_out)               
    );

     assign p1_bdata_in  = {buser,bresp,bid};
     assign p1_bvalid_in = bvalid;
     assign bready      = p1_bready_in;
     assign p1_bid      = p1_bdata_out[0 +: AXI_SLAVE_ID_W];
     assign p1_bresp    = p1_bdata_out[AXI_SLAVE_ID_W +: 2];
     assign p1_buser    = p1_bdata_out[AXI_SLAVE_ID_W+2 +: RESP_USER_WIDTH];
    nios_system_altera_merlin_axi_slave_ni_altera_avalon_st_pipeline_stage_19112_pnq6y4i #(
      .SYMBOLS_PER_BEAT (1),
      .BITS_PER_SYMBOL  (ST_PIPELINE_WR_DATA_W),
      .USE_PACKETS      (0),
      .USE_EMPTY        (0),
      .PIPELINE_READY   (0),
      .SYNC_RESET       (SYNC_RESET),
      .CHANNEL_WIDTH    (0),
      .ERROR_WIDTH      (0)
    ) altera_avalon_st_pipeline_stage_wr (
        .clk               (aclk),                                 
        .reset             (areset),                               
        .in_data           (p1_bdata_in),                
        .in_valid          (p1_bvalid_in),               
        .in_ready          (p1_bready_in),               
        .out_data          (p1_bdata_out),               
        .out_valid         (p1_bvalid_out),              
        .out_ready         (p1_bready_out)               
    );

  end
  else begin
    assign p1_rdata = rdata;  
    assign p1_rid   = rid;  
    assign p1_rresp = rresp;  
    assign p1_ruser = ruser;  
    assign p1_rlast = rlast;
    assign p1_rdatachk = ruser_datachk;
    assign p1_rpoison  = ruser_poison;
    assign p1_ruser_data   = ruser_data;
    assign rready   = p1_ready_out;

    assign p1_bid   = bid;  
    assign p1_bresp = bresp;  
    assign p1_buser = buser;  
    assign bready   = p1_bready_out;
  end      
endgenerate

generate
  if (ENABLE_OOO ==1)begin
    assign rid_resp_mem     = (p1_ready_in == 1) ? rid : p1_rid;
    assign rvalid_resp_mem  = p1_valid_out;
    assign bid_resp_mem     = (p1_bready_in == 1) ? bid : p1_bid;
    assign bvalid_resp_mem  = p1_bvalid_out;
  end
  else begin
   assign rvalid_resp_mem = rvalid;   
   assign bvalid_resp_mem = bvalid;   
 end
endgenerate

//based on ENABLE_OOO , instantiate pipeline stage at read_rp/write_rp output ports. 
reg sop_enable;
generate
     if(ENABLE_OOO ==1 && REORDER_BUFFER == 1)begin
           if(SYNC_RESET == 0) begin : async_rst1
               always_ff @(posedge aclk, negedge aresetn)
               begin
                   if (!aresetn)
                       begin
                           sop_enable <= 1'b1;
                       end
                   else
                       begin
                           if(p1_rlast && read_rp_valid_temp && read_rp_ready_temp)
                              sop_enable <= 1;
                           else if(read_rp_valid_temp && read_rp_ready_temp)
                              sop_enable <= 0;               
                       end
               end
           end : async_rst1
           
           else begin : sync_rst1   
             always_ff @(posedge aclk)
             begin
                 if (internal_sclr)
                     begin
                         sop_enable <= 1'b1;
                     end
                 else
                    begin
                        if(p1_rlast && read_rp_valid_temp && read_rp_ready_temp)
                           sop_enable <= 1;
                        else if (read_rp_valid_temp && read_rp_ready_temp)
                           sop_enable <= 0;               
                    end
             end
           end : sync_rst1
     end     
     else begin
          always @* begin
              sop_enable = read_rp_startofpacket_temp;
          end
     end
     
   if(ENABLE_OOO ==1 && REORDER_BUFFER == 0)begin

       nios_system_altera_merlin_axi_slave_ni_altera_avalon_st_pipeline_stage_19112_nf734xy #(
             .SYMBOLS_PER_BEAT (1),
             .BITS_PER_SYMBOL  (ST_DATA_W),
             .USE_PACKETS      (1),
             .USE_EMPTY        (0),
             .PIPELINE_READY   (1),
             .SYNC_RESET       (SYNC_RESET),
             .CHANNEL_WIDTH    (0),
             .ERROR_WIDTH      (0),
             .PACKET_WIDTH     (2)
           ) altera_avalon_st_pipeline_stage_rd_rp (
               .clk               (aclk),                                 
               .reset             (areset),                               
               .in_data           (read_rp_data_temp),                
               .in_valid          (read_rp_valid_temp),               
               .in_ready          (read_rp_ready_temp),   
               .in_startofpacket  (sop_enable),  
               .in_endofpacket    (read_rp_endofpacket_temp),            
               .out_data          (read_rp_data),               
               .out_valid         (read_rp_valid),              
               .out_ready         (read_rp_ready),
               .out_startofpacket  (read_rp_startofpacket),  
               .out_endofpacket    (read_rp_endofpacket)               
           );
       
       nios_system_altera_merlin_axi_slave_ni_altera_avalon_st_pipeline_stage_19112_nf734xy #(
             .SYMBOLS_PER_BEAT (1),
             .BITS_PER_SYMBOL  (ST_DATA_W),
             .USE_PACKETS      (1),
             .USE_EMPTY        (0),
             .PIPELINE_READY   (1),
             .SYNC_RESET       (SYNC_RESET),
             .CHANNEL_WIDTH    (0),
             .ERROR_WIDTH      (0),
             .PACKET_WIDTH     (2)
           ) altera_avalon_st_pipeline_stage_wr_rp (
               .clk               (aclk),                                 
               .reset             (areset),                               
               .in_data           (write_rp_data_temp),                
               .in_valid          (write_rp_valid_temp),               
               .in_ready          (write_rp_ready_temp),  
               .in_startofpacket  (write_rp_startofpacket_temp),  
               .in_endofpacket    (write_rp_endofpacket_temp),              
               .out_data          (write_rp_data),               
               .out_valid         (write_rp_valid),              
               .out_ready         (write_rp_ready),
               .out_startofpacket  (write_rp_startofpacket),  
               .out_endofpacket    (write_rp_endofpacket)               
           );
       
   end 
   else begin
     
        assign read_rp_data = read_rp_data_temp ;
        assign read_rp_valid = read_rp_valid_temp  ;
        assign read_rp_startofpacket = sop_enable  ;
        assign read_rp_endofpacket = read_rp_endofpacket_temp  ;
        assign read_rp_ready_temp = read_rp_ready;
        
        assign write_rp_data = write_rp_data_temp ;
        assign write_rp_valid = write_rp_valid_temp  ;
        assign write_rp_startofpacket = write_rp_startofpacket_temp  ;
        assign write_rp_endofpacket = write_rp_endofpacket_temp  ;
        assign write_rp_ready_temp = write_rp_ready;
     
   end
endgenerate
     
//--------------------------------------
// Assertion: for write / read FIFOs
//--------------------------------------
// synthesis translate_off  
generate
  if (ENABLE_OOO == 0) begin    
    ERROR_write_transaction_occurs_when_write_rsp_fifo_is_full:
        assert property ( @(posedge aclk)
            disable iff (areset) (!write_rsp_fifo_inready |-> !write_rsp_fifo_invalid)
        );
    
    ERROR_read_transaction_occurs_when_read_rsp_fifo_is_full:
        assert property ( @(posedge aclk)
            disable iff (areset) (!read_rsp_fifo_inready |-> !read_rsp_fifo_invalid)
        );    
   end
endgenerate
   
   generate
     if(ENABLE_OOO == 0)begin
        if (USE_MEMORY_BLOCKS) begin : Using_M20k_change4
            ERROR_write_response_occurs_when_write_rsp_fifo_is_empty:
                assert property ( @(posedge aclk)
                   disable iff (areset) (!write_rsp_fifo_outvalid |-> !(bvalid && write_rsp_fifo_outvalid))
            );  
        end else begin : Using_ALM_memory_change4
            ERROR_write_response_occurs_when_write_rsp_fifo_is_empty:
                assert property ( @(posedge aclk)
                    disable iff (areset) (!write_rsp_fifo_outvalid |-> !bvalid)
                ); 
        end
     end   
   endgenerate

   generate
     if(ENABLE_OOO == 0)begin
        if (USE_MEMORY_BLOCKS) begin : Using_M20k_change5
             ERROR_readdata_receive_but_read_ID_fifo_is_empty:
                 assert property ( @(posedge aclk)
                     disable iff (areset) (!read_rsp_fifo_outvalid |-> !(rvalid_resp_mem && read_rsp_fifo_outvalid))
                 );
        end else begin : Using_ALM_memory_change5
             ERROR_readdata_receive_but_read_ID_fifo_is_empty:
                 assert property ( @(posedge aclk)
                     disable iff (areset) (!read_rsp_fifo_outvalid |-> !rvalid_resp_mem)
                 );
        end
     end  
   endgenerate
 

ERROR_pkt_trans_write_not_asserted_when_write_cp_valid_is_asserted:
    assert property ( @(posedge aclk)
        disable iff (areset) (write_cp_valid |-> write_cp_data[PKT_TRANS_WRITE])
    );

// synthesis translate_on


endmodule



