UberDDR3/rtl/ddr3_phy.v

`default_nettype none
module ddr3_phy #(
    parameter ROW_BITS = 14,
              BA_BITS = 3,
              DQ_BITS = 8,
              LANES = 8,
              CONTROLLER_CLK_PERIOD = 5, //ns, period of clock input to this DDR3 controller module
              DDR3_CLK_PERIOD = 1.25, //ns, period of clock input to DDR3 RAM device 
              // The next parameters act more like a localparam (since user does not have to set this manually) but was added here to simplify port declaration
              serdes_ratio = $rtoi(CONTROLLER_CLK_PERIOD/DDR3_CLK_PERIOD),
              wb_data_bits = DQ_BITS*LANES*serdes_ratio*2,
              wb_sel_bits = wb_data_bits / 8,
              //4 is the width of a single ddr3 command {cs_n, ras_n, cas_n, we_n} plus 3 (ck_en, odt, reset_n) plus bank bits plus row bits
              cmd_len = 4 + 3 + BA_BITS + ROW_BITS
    )(
        input wire i_controller_clk, i_ddr3_clk, i_ref_clk,
        input wire i_rst_n,
        // Controller Interface
        input wire[cmd_len*serdes_ratio-1:0] i_controller_cmd,
        input wire i_controller_dqs_tri_control, i_controller_dq_tri_control,
        input wire i_controller_toggle_dqs,
        input wire[wb_data_bits-1:0] i_controller_data,
        input wire[wb_sel_bits-1:0] i_controller_dm,
        input wire[4:0] i_controller_odelay_data_cntvaluein,i_controller_odelay_dqs_cntvaluein,
        input wire[4:0] i_controller_idelay_data_cntvaluein,i_controller_idelay_dqs_cntvaluein,
        input wire[LANES-1:0] i_controller_odelay_data_ld, i_controller_odelay_dqs_ld,
        input wire[LANES-1:0] i_controller_idelay_data_ld, i_controller_idelay_dqs_ld,
        input wire[LANES-1:0] i_controller_bitslip,
        output wire[DQ_BITS*LANES*8-1:0] o_controller_iserdes_data,
        output wire[LANES*8-1:0] o_controller_iserdes_dqs,
        output wire[LANES*8-1:0] o_controller_iserdes_bitslip_reference,
        output wire o_controller_idelayctrl_rdy,
        // DDR3 I/O Interface
        output wire o_ddr3_clk_p,o_ddr3_clk_n,
        output wire o_ddr3_reset_n,
        output wire o_ddr3_cke, // CKE
        output wire o_ddr3_cs_n, // chip select signal
        output wire o_ddr3_ras_n, // RAS#
        output wire o_ddr3_cas_n, // CAS#
        output wire o_ddr3_we_n, // WE#
        output wire[ROW_BITS-1:0] o_ddr3_addr,
        output wire[BA_BITS-1:0] o_ddr3_ba_addr,
        inout wire[(DQ_BITS*LANES)-1:0] io_ddr3_dq,
        inout wire[(DQ_BITS*LANES)/8-1:0] io_ddr3_dqs, io_ddr3_dqs_n,
        output wire[LANES-1:0] o_ddr3_dm,
        output wire o_ddr3_odt // on-die termination
    );

    // cmd bit assignment
    localparam CMD_CS_N = cmd_len - 1, 
               CMD_RAS_N = cmd_len - 2,
               CMD_CAS_N= cmd_len - 3,
               CMD_WE_N = cmd_len - 4,
               CMD_ODT = cmd_len - 5,
               CMD_CKE = cmd_len - 6, 
               CMD_RESET_N = cmd_len - 7,
               CMD_BANK_START = BA_BITS + ROW_BITS - 1,
               CMD_ADDRESS_START = ROW_BITS - 1;
    localparam SYNC_RESET_DELAY = $rtoi($ceil(52/CONTROLLER_CLK_PERIOD)); //52 ns of reset pulse width required for IDELAYCTRL 
    //cmd needs to be center-aligned to the positive edge of the 
    //ddr3_clk. This means cmd needs to be delayed by half the ddr3
    //clk period. Subtract by 600ps to include the IODELAY insertion
    //delay. Divide by a delay resolution of 78.125ps per tap to get 
    //the needed tap value.
    localparam CMD_ODELAY_TAP = ((DDR3_CLK_PERIOD*1000/2) - 600)/78.125;

    // Data does not have to be delayed (DQS is the on that has to be
    // delayed and center-aligned to the center eye of data)
    localparam DATA_ODELAY_TAP = 0; 

    //DQS needs to be edge-aligned to the center eye of the data. 
    //This means DQS needs to be delayed by a quarter of the ddr3
    //clk period relative to the data. Subtract by 600ps to include
    //the IODELAY insertion delay. Divide by a delay resolution of 
    //78.125ps per tap to get the needed tap value. Then add the tap
    //value used in data to have the delay relative to the data.
    localparam DQS_ODELAY_TAP = ((DDR3_CLK_PERIOD*1000/4))/78.125 + DATA_ODELAY_TAP;
    
    //Incoming DQS should be 90 degree delayed relative to incoming data
    localparam DATA_IDELAY_TAP = 0; //600ps delay
    localparam DQS_IDELAY_TAP = ((DDR3_CLK_PERIOD*1000/4))/78.125 + DATA_IDELAY_TAP;
    
    genvar gen_index;
    wire[cmd_len-1:0] oserdes_cmd, //serialized(4:1) i_controller_cmd_slot_x 
                      cmd;//delayed oserdes_cmd
    wire[(DQ_BITS*LANES)-1:0] oserdes_data, odelay_data, idelay_data, read_dq;
    wire[LANES-1:0] oserdes_dm, odelay_dm;
    wire[LANES-1:0] odelay_dqs, read_dqs, idelay_dqs;
    wire[DQ_BITS*LANES-1:0] oserdes_dq_tri_control;
    wire[LANES-1:0] oserdes_dqs;
    wire[LANES-1:0] oserdes_dqs_tri_control;
    wire[LANES-1:0] oserdes_bitslip_reference;
    reg[$clog2(SYNC_RESET_DELAY):0] delay_before_release_reset;
    reg sync_rst = 0;
    wire ddr3_clk;
    reg toggle_dqs_q; //past value of i_controller_toggle_dqs
    //synchronous reset
    always @(posedge i_controller_clk, negedge i_rst_n) begin
        if(!i_rst_n) begin
            sync_rst <= 1'b1;
            delay_before_release_reset <= SYNC_RESET_DELAY;
            toggle_dqs_q <= 0;
        end
        else begin
            delay_before_release_reset <= (delay_before_release_reset == 0)? 0: delay_before_release_reset - 1;
            sync_rst <= !(delay_before_release_reset == 0);
            toggle_dqs_q <= i_controller_toggle_dqs;
        end
    end

    //PHY cmd 
    generate
        for(gen_index = 0; gen_index < cmd_len; gen_index = gen_index + 1) begin
            // OSERDESE2: Output SERial/DESerializer with bitslip
            //7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            OSERDESE2 #(
                .DATA_RATE_OQ("SDR"), // DDR, SDR
                .DATA_RATE_TQ("SDR"), // DDR, SDR
                .DATA_WIDTH(4), // Parallel data width (2-8,10,14)
                .INIT_OQ(1'b0), // Initial value of OQ output (1'b0,1'b1)
                .TRISTATE_WIDTH(1)
            )
            OSERDESE2_cmd(
                .OFB(oserdes_cmd[gen_index]), // 1-bit output: Feedback path for data
                .OQ(), // 1-bit output: Data path output
                .CLK(i_ddr3_clk), // 1-bit input: High speed clock
                .CLKDIV(i_controller_clk), // 1-bit input: Divided clock
                // D1 - D8: 1-bit (each) input: Parallel data inputs (1-bit each)
                .D1(i_controller_cmd[cmd_len*0 + gen_index]),
                .D2(i_controller_cmd[cmd_len*1 + gen_index]),
                .D3(i_controller_cmd[cmd_len*2 + gen_index]),
                .D4(i_controller_cmd[cmd_len*3 + gen_index]),
                .OCE(1), // 1-bit input: Output data clock enable
                .RST(sync_rst) // 1-bit input: Reset
            );
            // End of OSERDESE2_inst instantiation
        

        (* IODELAY_GROUP = 0 *) // Specifies group name for associated IDELAYs/ODELAYs and IDELAYCTRL
        //Delay the DQ
        // Delay resolution: 1/(32 x 2 x F REF ) = 78.125ps
        ODELAYE2 #(
            .DELAY_SRC("ODATAIN"), // Delay input (ODATAIN, CLKIN)
            .HIGH_PERFORMANCE_MODE("TRUE"), // Reduced jitter to 5ps ("TRUE"), Reduced power but high jitter 9ns ("FALSE")
            .ODELAY_TYPE("FIXED"), // FIXED, VARIABLE, VAR_LOAD, VAR_LOAD_PIPE
            .ODELAY_VALUE(CMD_ODELAY_TAP), // Output delay tap setting (0-31)
            .REFCLK_FREQUENCY(200.0), // IDELAYCTRL clock input frequency in MHz (190.0-210.0).
            .SIGNAL_PATTERN("DATA") // DATA, CLOCK input signal
        )
        ODELAYE2_cmd (
            .CNTVALUEOUT(), // 5-bit output: Counter value output
            .DATAOUT(cmd[gen_index]), // 1-bit output: Delayed data/clock output
            .C(i_controller_clk), // 1-bit input: Clock input, when using OSERDESE2, C is connected to CLKDIV
            .CE(0), // 1-bit input: Active high enable increment/decrement input
            .CINVCTRL(0), // 1-bit input: Dynamic clock inversion input
            .CLKIN(0), // 1-bit input: Clock delay input
            .CNTVALUEIN(0), // 5-bit input: Counter value input
            .INC(0), // 1-bit input: Increment / Decrement tap delay input
            .LD(0), // 1-bit input: Loads ODELAY_VALUE tap delay in VARIABLE mode, in VAR_LOAD or
                        // VAR_LOAD_PIPE mode, loads the value of CNTVALUEIN
            .LDPIPEEN(0), // 1-bit input: Enables the pipeline register to load data
            .ODATAIN(oserdes_cmd[gen_index]), // 1-bit input: Output delay data input
            .REGRST(0) // 1-bit input: Active-high reset tap-delay input
        );
        end
    endgenerate 

    assign o_ddr3_cs_n = cmd[CMD_CS_N],
           o_ddr3_ras_n = cmd[CMD_RAS_N],
           o_ddr3_cas_n = cmd[CMD_CAS_N],
           o_ddr3_we_n = cmd[CMD_WE_N],
           o_ddr3_odt = cmd[CMD_ODT],
           o_ddr3_cke = cmd[CMD_CKE],
           o_ddr3_reset_n = cmd[CMD_RESET_N],
           o_ddr3_ba_addr = cmd[CMD_BANK_START:CMD_ADDRESS_START+1],
           o_ddr3_addr = cmd[CMD_ADDRESS_START:0];

    // OSERDESE2: Output SERial/DESerializer with bitslip
    //7 Series
    // Xilinx HDL Libraries Guide, version 13.4
    OSERDESE2 #(
        .DATA_RATE_OQ("DDR"), // DDR, SDR
        .DATA_RATE_TQ("SDR"), // DDR, SDR
        .DATA_WIDTH(8), // Parallel data width (2-8,10,14)
        .INIT_OQ(1'b0), // Initial value of OQ output (1'b0,1'b1)
        .TRISTATE_WIDTH(1)
    )
    OSERDESE2_clk(
        .OFB(), // 1-bit output: Feedback path for data
        .OQ(ddr3_clk), // 1-bit output: Data path output
        .CLK(i_ddr3_clk), // 1-bit input: High speed clock
        .CLKDIV(i_controller_clk), // 1-bit input: Divided clock
        // D1 - D8: 1-bit (each) input: Parallel data inputs (1-bit each)
        .D1(1'b1),
        .D2(1'b0),
        .D3(1'b1),
        .D4(1'b0),
        .D5(1'b1),
        .D6(1'b0),
        .D7(1'b1),
        .D8(1'b0),
        .OCE(1), // 1-bit input: Output data clock enable
        .RST(sync_rst) // 1-bit input: Reset
    );
    // End of OSERDESE2_inst instantiation

    // OBUFDS: Differential Output Buffer
    // 7 Series
    // Xilinx HDL Libraries Guide, version 13.4
    OBUFDS OBUFDS_inst (
    .O(o_ddr3_clk_p), // Diff_p output (connect directly to top-level port)
    .OB(o_ddr3_clk_n), // Diff_n output (connect directly to top-level port)
    .I(ddr3_clk) // Buffer input
    );
    // End of OBUFDS_inst instantiation
            
    // PHY data and dm
    generate
        // data: oserdes -> odelay -> iobuf
        for(gen_index = 0; gen_index < (DQ_BITS*LANES); gen_index = gen_index + 1) begin
            // OSERDESE2: Output SERial/DESerializer with bitslip
            //7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            OSERDESE2 #(
                .DATA_RATE_OQ("DDR"), // DDR, SDR
                .DATA_RATE_TQ("BUF"), // DDR, SDR
                .DATA_WIDTH(8), // Parallel data width (2-8,10,14)
                .INIT_OQ(1'b0), // Initial value of OQ output (1'b0,1'b1)
                .TRISTATE_WIDTH(1)
            )
            OSERDESE2_data(
                .OFB(oserdes_data[gen_index]), // 1-bit output: Feedback path for data
                .OQ(), // 1-bit output: Data path output
                .TQ(oserdes_dq_tri_control[gen_index]),
                .CLK(i_ddr3_clk), // 1-bit input: High speed clock
                .CLKDIV(i_controller_clk), // 1-bit input: Divided clock
                // D1 - D8: 1-bit (each) input: Parallel data inputs (1-bit each)
                .D1(i_controller_data[gen_index + (DQ_BITS*LANES)*0]),
                .D2(i_controller_data[gen_index + (DQ_BITS*LANES)*1]),
                .D3(i_controller_data[gen_index + (DQ_BITS*LANES)*2]),
                .D4(i_controller_data[gen_index + (DQ_BITS*LANES)*3]),
                .D5(i_controller_data[gen_index + (DQ_BITS*LANES)*4]),
                .D6(i_controller_data[gen_index + (DQ_BITS*LANES)*5]),
                .D7(i_controller_data[gen_index + (DQ_BITS*LANES)*6]),
                .D8(i_controller_data[gen_index + (DQ_BITS*LANES)*7]),
                .T1(i_controller_dq_tri_control),
                .TCE(1'b1),
                .OCE(1), // 1-bit input: Output data clock enable
                .RST(sync_rst) // 1-bit input: Reset
            );
            // End of OSERDESE2_inst instantiation
            
            // ODELAYE2: Output Fixed or Variable Delay Element
            // 7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            //odelay adds an insertion delay of 600ps to the actual delay setting: https://support.xilinx.com/s/article/42133?language=en_US
            (* IODELAY_GROUP = 0 *) // Specifies group name for associated IDELAYs/ODELAYs and IDELAYCTRL
            //Delay the DQ
            // Delay resolution: 1/(32 x 2 x F REF ) = 78.125ps
            ODELAYE2 #(
                .DELAY_SRC("ODATAIN"), // Delay input (ODATAIN, CLKIN)
                .HIGH_PERFORMANCE_MODE("TRUE"), // Reduced jitter to 5ps ("TRUE"), Reduced power but high jitter 9ns ("FALSE")
                .ODELAY_TYPE("VAR_LOAD"), // FIXED, VARIABLE, VAR_LOAD, VAR_LOAD_PIPE
                .ODELAY_VALUE(DATA_ODELAY_TAP), // Output delay tap setting (0-31)
                .REFCLK_FREQUENCY(200.0), // IDELAYCTRL clock input frequency in MHz (190.0-210.0).
                .SIGNAL_PATTERN("DATA") // DATA, CLOCK input signal
            )
            ODELAYE2_data (
                .CNTVALUEOUT(), // 5-bit output: Counter value output
                .DATAOUT(odelay_data[gen_index]), // 1-bit output: Delayed data/clock output
                .C(i_controller_clk), // 1-bit input: Clock input, when using OSERDESE2, C is connected to CLKDIV
                .CE(1'b0), // 1-bit input: Active high enable increment/decrement input
                .CINVCTRL(0), // 1-bit input: Dynamic clock inversion input
                .CLKIN(0), // 1-bit input: Clock delay input
                .CNTVALUEIN(i_controller_odelay_data_cntvaluein), // 5-bit input: Counter value input
                .INC(1'b0), // 1-bit input: Increment / Decrement tap delay input
                .LD(i_controller_odelay_data_ld[$rtoi($floor(gen_index/8))]), // 1-bit input: Loads ODELAY_VALUE tap delay in VARIABLE mode, in VAR_LOAD or
                            // VAR_LOAD_PIPE mode, loads the value of CNTVALUEIN
                .LDPIPEEN(0), // 1-bit input: Enables the pipeline register to load data
                .ODATAIN(oserdes_data[gen_index]), // 1-bit input: Output delay data input
                .REGRST(0) // 1-bit input: Active-high reset tap-delay input
            );

            // IOBUF: Single-ended Bi-directional Buffer
            //All devices
            // Xilinx HDL Libraries Guide, version 13.4
            IOBUF #(
                .DRIVE(12), // Specify the output drive strength
                .IBUF_LOW_PWR("TRUE"), // Low Power - "TRUE", High Performance = "FALSE"
                .IOSTANDARD("SSTL15"), // Specify the I/O standard
                .SLEW("FAST") // Specify the output slew rate
            ) IOBUF_data (
                .O(read_dq[gen_index]),// Buffer output
                .IO(io_ddr3_dq[gen_index]), // Buffer inout port (connect directly to top-level port)
                .I(odelay_data[gen_index]), // Buffer input
                .T(oserdes_dq_tri_control[gen_index]) // 3-state enable input, high=read, low=write
            );
            
            // IDELAYE2: Input Fixed or Variable Delay Element
            // 7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            (* IODELAY_GROUP = 0 *) // Specifies group name for associated IDELAYs/ODELAYs and IDELAYCTRL
            IDELAYE2 #(
                .DELAY_SRC("IDATAIN"), // Delay input (IDATAIN, DATAIN)
                .HIGH_PERFORMANCE_MODE("TRUE"), //Reduced jitter ("TRUE"), Reduced power ("FALSE")
                .IDELAY_TYPE("VAR_LOAD"), //FIXED, VARIABLE, VAR_LOAD, VAR_LOAD_PIPE
                .IDELAY_VALUE(DATA_IDELAY_TAP), //Input delay tap setting (0-31)
                .PIPE_SEL("FALSE"),  //Select pipelined mode, FALSE, TRUE
                .REFCLK_FREQUENCY(200.0), //IDELAYCTRL clock input frequency in MHz (190.0-210.0).
                .SIGNAL_PATTERN("DATA") //DATA, CLOCK input signal
            )
            IDELAYE2_data (
                .CNTVALUEOUT(), // 5-bit output: Counter value output
                .DATAOUT(idelay_data[gen_index]), // 1-bit output: Delayed data output
                .C(i_controller_clk), // 1-bit input: Clock input
                .CE(1'b0), // 1-bit input: Active high enable increment/decrement input
                .CINVCTRL(0),// 1-bit input: Dynamic clock inversion input
                .CNTVALUEIN(i_controller_idelay_data_cntvaluein), // 5-bit input: Counter value input
                .DATAIN(), //1-bit input: Internal delay data input
                .IDATAIN(read_dq[gen_index]), // 1-bit input: Data input from the I/O
                .INC(1'b0), // 1-bit input: Increment / Decrement tap delay input
                .LD(i_controller_idelay_data_ld[$rtoi($floor(gen_index/8))]), // 1-bit input: Load IDELAY_VALUE input
                .LDPIPEEN(0), // 1-bit input: Enable PIPELINE register to load data input
                .REGRST(0) // 1-bit input: Active-high reset tap-delay input
            );
            // End of IDELAYE2_inst instantiation

            // End of IOBUF_inst instantiation                 
            // ISERDESE2: Input SERial/DESerializer with bitslip
            //7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            ISERDESE2 #(
                .DATA_RATE("DDR"), // DDR, SDR
                .DATA_WIDTH(8), // Parallel data width (2-8,10,14)
                // INIT_Q1 - INIT_Q4: Initial value on the Q outputs (0/1)
                .INIT_Q1(1'b0),
                .INIT_Q2(1'b0),
                .INIT_Q3(1'b0),
                .INIT_Q4(1'b0),
                .INTERFACE_TYPE("NETWORKING"), // MEMORY, MEMORY_DDR3, MEMORY_QDR, NETWORKING, OVERSAMPLE
                .IOBDELAY("BOTH"), // NONE, BOTH, IBUF, IFD
                .NUM_CE(1),// Number of clock enables (1,2)
                .OFB_USED("FALSE"), // Select OFB path (FALSE, TRUE)
                // SRVAL_Q1 - SRVAL_Q4: Q output values when SR is used (0/1)
                .SRVAL_Q1(1'b0),
                .SRVAL_Q2(1'b0),
                .SRVAL_Q3(1'b0),
                .SRVAL_Q4(1'b0)
            )
            ISERDESE2_data (
                .O(),
                // 1-bit output: Combinatorial output
                // Q1 - Q8: 1-bit (each) output: Registered data outputs
                .Q1(o_controller_iserdes_data[(DQ_BITS*LANES)*7 + gen_index]),//56
                .Q2(o_controller_iserdes_data[(DQ_BITS*LANES)*6 + gen_index]), //48
                .Q3(o_controller_iserdes_data[(DQ_BITS*LANES)*5 + gen_index]),
                .Q4(o_controller_iserdes_data[(DQ_BITS*LANES)*4 + gen_index]),   
                .Q5(o_controller_iserdes_data[(DQ_BITS*LANES)*3 + gen_index]),
                .Q6(o_controller_iserdes_data[(DQ_BITS*LANES)*2 + gen_index]),
                .Q7(o_controller_iserdes_data[(DQ_BITS*LANES)*1 + gen_index]), 
                .Q8(o_controller_iserdes_data[(DQ_BITS*LANES)*0 + gen_index]),
                // SHIFTOUT1-SHIFTOUT2: 1-bit (each) output: Data width expansion output ports
                .SHIFTOUT1(),
                .SHIFTOUT2(),
                .BITSLIP(i_controller_bitslip[$rtoi($floor(gen_index/8))]),
                // 1-bit input: The BITSLIP pin performs a Bitslip operation synchronous to
                // CLKDIV when asserted (active High). Subsequently, the data seen on the Q1
                // to Q8 output ports will shift, as in a barrel-shifter operation, one
                // position every time Bitslip is invoked (DDR operation is different from
                // SDR).
                // CE1, CE2: 1-bit (each) input: Data register clock enable inputs
                .CE1(1),
                .CE2(1),
                .CLKDIVP(), // 1-bit input: TBD
                // Clocks: 1-bit (each) input: ISERDESE2 clock input ports
                .CLK(i_ddr3_clk), // 1-bit input: High-speed clock
                .CLKB(!i_ddr3_clk), // 1-bit input: High-speed secondary clock
                .CLKDIV(i_controller_clk), // 1-bit input: Divided clock
                .OCLK(), // 1-bit input: High speed output clock used when INTERFACE_TYPE="MEMORY"
                // Dynamic Clock Inversions: 1-bit (each) input: Dynamic clock inversion pins to switch clock polarity
                .DYNCLKDIVSEL(), // 1-bit input: Dynamic CLKDIV inversion
                .DYNCLKSEL(), // 1-bit input: Dynamic CLK/CLKB inversion
                // Input Data: 1-bit (each) input: ISERDESE2 data input ports
                .D(), // 1-bit input: Data input
                .DDLY(idelay_data[gen_index]), // 1-bit input: Serial data from IDELAYE2
                .OFB(), // 1-bit input: Data feedback from OSERDESE2
                .OCLKB(), // 1-bit input: High speed negative edge output clock
                .RST(sync_rst), // 1-bit input: Active high asynchronous reset
                // SHIFTIN1-SHIFTIN2: 1-bit (each) input: Data width expansion input ports
                .SHIFTIN1(),
                .SHIFTIN2()
            );
            // End of ISERDESE2_inst instantiation
  
        end
        
        // data mask: oserdes -> odelay -> obuf
        for(gen_index = 0; gen_index < LANES; gen_index = gen_index + 1) begin
            // OSERDESE2: Output SERial/DESerializer with bitslip
            //7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            OSERDESE2 #(
                .DATA_RATE_OQ("DDR"), // DDR, SDR
                .DATA_RATE_TQ("BUF"), // DDR, SDR
                .DATA_WIDTH(8), // Parallel data width (2-8,10,14)
                .INIT_OQ(1'b0), // Initial value of OQ output (1'b0,1'b1)
                .TRISTATE_WIDTH(1)
            )
            OSERDESE2_dm(
                .OFB(oserdes_dm[gen_index]), // 1-bit output: Feedback path for data
                .OQ(), // 1-bit output: Data path output
                .TQ(),
                .CLK(i_ddr3_clk), // 1-bit input: High speed clock
                .CLKDIV(i_controller_clk), // 1-bit input: Divided clock
                // D1 - D8: 1-bit (each) input: Parallel data inputs (1-bit each)
                .D1(i_controller_dm[gen_index + LANES*0]),
                .D2(i_controller_dm[gen_index + LANES*1]),
                .D3(i_controller_dm[gen_index + LANES*2]),
                .D4(i_controller_dm[gen_index + LANES*3]),
                .D5(i_controller_dm[gen_index + LANES*4]),
                .D6(i_controller_dm[gen_index + LANES*5]),
                .D7(i_controller_dm[gen_index + LANES*6]),
                .D8(i_controller_dm[gen_index + LANES*7]),
                .TCE(0),
                .OCE(1), // 1-bit input: Output data clock enable
                .RST(sync_rst) // 1-bit input: Reset
            );
            // End of OSERDESE2_inst instantiation
            
            // ODELAYE2: Output Fixed or Variable Delay Element
            // 7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            //odelay adds an insertion delay of 600ps to the actual delay setting: https://support.xilinx.com/s/article/42133?language=en_US
            (* IODELAY_GROUP = 0 *) // Specifies group name for associated IDELAYs/ODELAYs and IDELAYCTRL
            //Delay the DQ
            // Delay resolution: 1/(32 x 2 x F REF ) = 78.125ps
            ODELAYE2 #(
                .DELAY_SRC("ODATAIN"), // Delay input (ODATAIN, CLKIN)
                .HIGH_PERFORMANCE_MODE("TRUE"), // Reduced jitter to 5ps ("TRUE"), Reduced power but high jitter 9ns ("FALSE")
                .ODELAY_TYPE("VAR_LOAD"), // FIXED, VARIABLE, VAR_LOAD, VAR_LOAD_PIPE
                .ODELAY_VALUE(DATA_ODELAY_TAP), // Output delay tap setting (0-31)
                .REFCLK_FREQUENCY(200.0), // IDELAYCTRL clock input frequency in MHz (190.0-210.0).
                .SIGNAL_PATTERN("DATA") // DATA, CLOCK input signal
            )
            ODELAYE2_dm (
                .CNTVALUEOUT(), // 5-bit output: Counter value output
                .DATAOUT(odelay_dm[gen_index]), // 1-bit output: Delayed data/clock output
                .C(i_controller_clk), // 1-bit input: Clock input, when using OSERDESE2, C is connected to CLKDIV
                .CE(1'b0), // 1-bit input: Active high enable increment/decrement input
                .CINVCTRL(0), // 1-bit input: Dynamic clock inversion input
                .CLKIN(0), // 1-bit input: Clock delay input
                .CNTVALUEIN(i_controller_odelay_data_cntvaluein), // 5-bit input: Counter value input
                .INC(1'b0), // 1-bit input: Increment / Decrement tap delay input
                .LD(i_controller_odelay_data_ld[gen_index]), // 1-bit input: Loads ODELAY_VALUE tap delay in VARIABLE mode, in VAR_LOAD or
                            // VAR_LOAD_PIPE mode, loads the value of CNTVALUEIN
                .LDPIPEEN(0), // 1-bit input: Enables the pipeline register to load data
                .ODATAIN(oserdes_dm[gen_index]), // 1-bit input: Output delay data input
                .REGRST(0) // 1-bit input: Active-high reset tap-delay input
            );
            
            // OBUF: Single-ended Output Buffer
            // 7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            OBUF #(
            //.IOSTANDARD("SSTL_15"), // Specify the output I/O standard
            .SLEW("FAST") // Specify the output slew rate
            ) OBUF_dm (
                .O(o_ddr3_dm[gen_index]), // Buffer output (connect directly to top-level port)
                .I(odelay_dm[gen_index]) // Buffer input
            );
            // End of OBUF_inst instantiation
        end

        //800MHz = 
        // dqs: odelay -> iobuf
        for(gen_index = 0; gen_index < LANES; gen_index = gen_index + 1) begin
        
            // ODELAYE2: Output Fixed or Variable Delay Element
            // 7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            (* IODELAY_GROUP = 0 *) // Specifies group name for associated IDELAYs/ODELAYs and IDELAYCTRL
            //Delay the DQ
            ODELAYE2 #(
                .DELAY_SRC("ODATAIN"), // Delay input (ODATAIN, CLKIN)
                .HIGH_PERFORMANCE_MODE("TRUE"), // Reduced jitter ("TRUE"), Reduced power ("FALSE")
                .ODELAY_TYPE("VAR_LOAD"), // FIXED, VARIABLE, VAR_LOAD, VAR_LOAD_PIPE
                .ODELAY_VALUE(DQS_ODELAY_TAP), // delay to align odelay_dqs to oserdes_dqs due to 600ps insertion delay: (1/800MHz - 600ps)/78.125ps = 8.32 taps
                .REFCLK_FREQUENCY(200.0), // IDELAYCTRL clock input frequency in MHz (190.0-210.0).
                .SIGNAL_PATTERN("DATA") // DATA, CLOCK input signal
            )
            ODELAYE2_dqs (
                .CNTVALUEOUT(), // 5-bit output: Counter value output
                .DATAOUT(odelay_dqs[gen_index]), // 1-bit output: Delayed data/clock output
                .C(i_controller_clk), // 1-bit input: Clock input, when using OSERDESE2, C is connected to CLKDIV
                .CE(0), // 1-bit input: Active high enable increment/decrement input
                .CINVCTRL(0), // 1-bit input: Dynamic clock inversion input
                .CLKIN(0), // 1-bit input: Clock delay input
                .CNTVALUEIN(i_controller_odelay_dqs_cntvaluein), // 5-bit input: Counter value input
                .INC(0), // 1-bit input: Increment / Decrement tap delay input
                .LD(i_controller_odelay_dqs_ld[gen_index]), // 1-bit input: Loads ODELAY_VALUE tap delay in VARIABLE mode, in VAR_LOAD or
                            // VAR_LOAD_PIPE mode, loads the value of CNTVALUEIN
                .LDPIPEEN(0), // 1-bit input: Enables the pipeline register to load data
                .ODATAIN(oserdes_dqs[gen_index]), // 1-bit input: Output delay data input
                .REGRST(0) // 1-bit input: Active-high reset tap-delay input
            );

            // OSERDESE2: Output SERial/DESerializer with bitslip
            //7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            OSERDESE2 #(
                .DATA_RATE_OQ("DDR"), // DDR, SDR
                .DATA_RATE_TQ("BUF"), // DDR, SDR
                .DATA_WIDTH(8), // Parallel data width (2-8,10,14)
                .INIT_OQ(1'b1), // Initial value of OQ output (1'b0,1'b1)
                .TRISTATE_WIDTH(1)
            )
            OSERDESE2_dqs(
                .OFB(oserdes_dqs[gen_index]), // 1-bit output: Feedback path for data
                .OQ(), // 1-bit output: Data path output
                .TQ(oserdes_dqs_tri_control[gen_index]),
                .CLK(i_ddr3_clk), // 1-bit input: High speed clock
                .CLKDIV(i_controller_clk), // 1-bit input: Divided clock
                // D1 - D8: 1-bit (each) input: Parallel data inputs (1-bit each)
                .D1(1'b1 && (i_controller_toggle_dqs || toggle_dqs_q)), //the last part will still have half dqs series
                .D2(1'b0 && (i_controller_toggle_dqs || toggle_dqs_q)),
                .D3(1'b1 && (i_controller_toggle_dqs || toggle_dqs_q)),
                .D4(1'b0 && (i_controller_toggle_dqs || toggle_dqs_q)),
                .D5(1'b1 && i_controller_toggle_dqs),
                .D6(1'b0 && i_controller_toggle_dqs),
                .D7(1'b1 && i_controller_toggle_dqs),
                .D8(1'b0 && i_controller_toggle_dqs),
                .T1(i_controller_dqs_tri_control),
                .TCE(1'b1),
                .OCE(1), // 1-bit input: Output data clock enable
                .RST(sync_rst) // 1-bit input: Reset
            );
            // End of OSERDESE2_inst instantiation
            
            // IOBUFDS: Differential Bi-directional Buffer
            //7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            IOBUFDS #(
                //.DIFF_TERM("FALSE"), // Differential Termination ("TRUE"/"FALSE")
                //.IBUF_LOW_PWR("TRUE"), // Low Power - "TRUE", High Performance = "FALSE"
                .IOSTANDARD("DIFF_SSTL15") // Specify the I/O standard. CONSULT WITH DATASHEET
                //.SLEW("FAST") // Specify the output slew rate
            ) IOBUFDS_inst (
                .O(read_dqs[gen_index]), // Buffer output
                .IO(io_ddr3_dqs[gen_index]), // Diff_p inout (connect directly to top-level port)
                .IOB(io_ddr3_dqs_n[gen_index]), // Diff_n inout (connect directly to top-level port)
                .I(odelay_dqs[gen_index]), // Buffer input
                .T(/*!dqs_tri_control[gen_index]*/oserdes_dqs_tri_control[gen_index]) // 3-state enable input, high=input, low=output
            ); // End of IOBUFDS_inst instantiation
            

            // IDELAYE2: Input Fixed or Variable Delay Element
            // 7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            (* IODELAY_GROUP = 0 *) // Specifies group name for associated IDELAYs/ODELAYs and IDELAYCTRL
            IDELAYE2 #(
                .DELAY_SRC("IDATAIN"), // Delay input (IDATAIN, DATAIN)
                .HIGH_PERFORMANCE_MODE("TRUE"), //Reduced jitter ("TRUE"), Reduced power ("FALSE")
                .IDELAY_TYPE("VAR_LOAD"), //FIXED, VARIABLE, VAR_LOAD, VAR_LOAD_PIPE
                .IDELAY_VALUE(DQS_IDELAY_TAP), //Input delay tap setting (0-31)
                .PIPE_SEL("FALSE"),  //Select pipelined mode, FALSE, TRUE
                .REFCLK_FREQUENCY(200.0), //IDELAYCTRL clock input frequency in MHz (190.0-210.0).
                .SIGNAL_PATTERN("DATA") //DATA, CLOCK input signal
            )
            IDELAYE2_dqs (
                .CNTVALUEOUT(), // 5-bit output: Counter value output
                .DATAOUT(idelay_dqs[gen_index]), // 1-bit output: Delayed data output
                .C(i_controller_clk), // 1-bit input: Clock input
                .CE(0), // 1-bit input: Active high enable increment/decrement input
                .CINVCTRL(0),// 1-bit input: Dynamic clock inversion input
                .CNTVALUEIN(i_controller_idelay_dqs_cntvaluein), // 5-bit input: Counter value input
                .DATAIN(), //1-bit input: Internal delay data input
                .IDATAIN(read_dqs[gen_index]), // 1-bit input: Data input from the I/O
                .INC(0), // 1-bit input: Increment / Decrement tap delay input
                .LD(i_controller_idelay_dqs_ld[gen_index]), // 1-bit input: Load IDELAY_VALUE input
                .LDPIPEEN(0), // 1-bit input: Enable PIPELINE register to load data input
                .REGRST(0) // 1-bit input: Active-high reset tap-delay input
            );
            // End of IDELAYE2_inst instantiation
            
              // End of IOBUF_inst instantiation                 
            // ISERDESE2: Input SERial/DESerializer with bitslip
            //7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            ISERDESE2 #(
                .DATA_RATE("DDR"), // DDR, SDR
                .DATA_WIDTH(8), // Parallel data width (2-8,10,14)
                // INIT_Q1 - INIT_Q4: Initial value on the Q outputs (0/1)
                .INIT_Q1(1'b0),
                .INIT_Q2(1'b0),
                .INIT_Q3(1'b0),
                .INIT_Q4(1'b0),
                .INTERFACE_TYPE("NETWORKING"), // MEMORY, MEMORY_DDR3, MEMORY_QDR, NETWORKING, OVERSAMPLE
                .IOBDELAY("BOTH"), // NONE, BOTH, IBUF, IFD
                .NUM_CE(1),// Number of clock enables (1,2)
                .OFB_USED("FALSE"), // Select OFB path (FALSE, TRUE)
                // SRVAL_Q1 - SRVAL_Q4: Q output values when SR is used (0/1)
                .SRVAL_Q1(1'b0),
                .SRVAL_Q2(1'b0),
                .SRVAL_Q3(1'b0),
                .SRVAL_Q4(1'b0)
            )
            ISERDESE2_dqs (
                .O(),
                // 1-bit output: Combinatorial output
                // Q1 - Q8: 1-bit (each) output: Registered data outputs
                .Q1(o_controller_iserdes_dqs[LANES*gen_index + 7]),
                .Q2(o_controller_iserdes_dqs[LANES*gen_index + 6]),
                .Q3(o_controller_iserdes_dqs[LANES*gen_index + 5]),
                .Q4(o_controller_iserdes_dqs[LANES*gen_index + 4]),   
                .Q5(o_controller_iserdes_dqs[LANES*gen_index + 3]),
                .Q6(o_controller_iserdes_dqs[LANES*gen_index + 2]),
                .Q7(o_controller_iserdes_dqs[LANES*gen_index + 1]),
                .Q8(o_controller_iserdes_dqs[LANES*gen_index + 0]),
                // SHIFTOUT1-SHIFTOUT2: 1-bit (each) output: Data width expansion output ports
                .SHIFTOUT1(),
                .SHIFTOUT2(),
                .BITSLIP(i_controller_bitslip[gen_index]),
                // 1-bit input: The BITSLIP pin performs a Bitslip operation synchronous to
                // CLKDIV when asserted (active High). Subsequently, the data seen on the Q1
                // to Q8 output ports will shift, as in a barrel-shifter operation, one
                // position every time Bitslip is invoked (DDR operation is different from
                // SDR).
                // CE1, CE2: 1-bit (each) input: Data register clock enable inputs
                .CE1(1),
                .CE2(1),
                .CLKDIVP(), // 1-bit input: TBD
                // Clocks: 1-bit (each) input: ISERDESE2 clock input ports
                .CLK(i_ddr3_clk), // 1-bit input: High-speed clock
                .CLKB(!i_ddr3_clk), // 1-bit input: High-speed secondary clock
                .CLKDIV(i_controller_clk), // 1-bit input: Divided clock
                .OCLK(), // 1-bit input: High speed output clock used when INTERFACE_TYPE="MEMORY"
                // Dynamic Clock Inversions: 1-bit (each) input: Dynamic clock inversion pins to switch clock polarity
                .DYNCLKDIVSEL(), // 1-bit input: Dynamic CLKDIV inversion
                .DYNCLKSEL(), // 1-bit input: Dynamic CLK/CLKB inversion
                // Input Data: 1-bit (each) input: ISERDESE2 data input ports
                .D(), // 1-bit input: Data input
                .DDLY(idelay_dqs[gen_index]), // 1-bit input: Serial data from IDELAYE2
                .OFB(), // 1-bit input: Data feedback from OSERDESE2
                .OCLKB(), // 1-bit input: High speed negative edge output clock
                .RST(sync_rst), // 1-bit input: Active high asynchronous reset
                // SHIFTIN1-SHIFTIN2: 1-bit (each) input: Data width expansion input ports
                .SHIFTIN1(),
                .SHIFTIN2()
            );
            // End of ISERDESE2_inst instantiation
            
                      
            //ISERDES train
            // End of IOBUF_inst instantiation                 
            // ISERDESE2: Input SERial/DESerializer with bitslip
            //7 Series
            // Xilinx HDL Libraries Guide, version 13.4
            ISERDESE2 #(
                .DATA_RATE("DDR"), // DDR, SDR
                .DATA_WIDTH(8), // Parallel data width (2-8,10,14)
                // INIT_Q1 - INIT_Q4: Initial value on the Q outputs (0/1)
                .INIT_Q1(1'b0),
                .INIT_Q2(1'b0),
                .INIT_Q3(1'b0),
                .INIT_Q4(1'b0),
                .INTERFACE_TYPE("NETWORKING"), // MEMORY, MEMORY_DDR3, MEMORY_QDR, NETWORKING, OVERSAMPLE
                .IOBDELAY("NONE"), // NONE, BOTH, IBUF, IFD
                .NUM_CE(1),// Number of clock enables (1,2)
                .OFB_USED("TRUE"), // Select OFB path (FALSE, TRUE)
                // SRVAL_Q1 - SRVAL_Q4: Q output values when SR is used (0/1)
                .SRVAL_Q1(1'b0),
                .SRVAL_Q2(1'b0),
                .SRVAL_Q3(1'b0),
                .SRVAL_Q4(1'b0)
            )
            ISERDESE2_train (
                .O(),
                // 1-bit output: Combinatorial output
                // Q1 - Q8: 1-bit (each) output: Registered data outputs
                .Q1(o_controller_iserdes_bitslip_reference[gen_index*LANES + 7]),
                .Q2(o_controller_iserdes_bitslip_reference[gen_index*LANES + 6]),
                .Q3(o_controller_iserdes_bitslip_reference[gen_index*LANES + 5]),
                .Q4(o_controller_iserdes_bitslip_reference[gen_index*LANES + 4]),   
                .Q5(o_controller_iserdes_bitslip_reference[gen_index*LANES + 3]),
                .Q6(o_controller_iserdes_bitslip_reference[gen_index*LANES + 2]),
                .Q7(o_controller_iserdes_bitslip_reference[gen_index*LANES + 1]),
                .Q8(o_controller_iserdes_bitslip_reference[gen_index*LANES + 0]),
                // SHIFTOUT1-SHIFTOUT2: 1-bit (each) output: Data width expansion output ports
                .SHIFTOUT1(),
                .SHIFTOUT2(),
                .BITSLIP(i_controller_bitslip[gen_index]),
                // 1-bit input: The BITSLIP pin performs a Bitslip operation synchronous to
                // CLKDIV when asserted (active High). Subsequently, the data seen on the Q1
                // to Q8 output ports will shift, as in a barrel-shifter operation, one
                // position every time Bitslip is invoked (DDR operation is different from
                // SDR).
                // CE1, CE2: 1-bit (each) input: Data register clock enable inputs
                .CE1(1),
                .CE2(1),
                .CLKDIVP(), // 1-bit input: TBD
                // Clocks: 1-bit (each) input: ISERDESE2 clock input ports
                .CLK(i_ddr3_clk), // 1-bit input: High-speed clock
                .CLKB(!i_ddr3_clk), // 1-bit input: High-speed secondary clock
                .CLKDIV(i_controller_clk), // 1-bit input: Divided clock
                .OCLK(), // 1-bit input: High speed output clock used when INTERFACE_TYPE="MEMORY"
                // Dynamic Clock Inversions: 1-bit (each) input: Dynamic clock inversion pins to switch clock polarity
                .DYNCLKDIVSEL(), // 1-bit input: Dynamic CLKDIV inversion
                .DYNCLKSEL(), // 1-bit input: Dynamic CLK/CLKB inversion
                // Input Data: 1-bit (each) input: ISERDESE2 data input ports
                .D(), // 1-bit input: Data input
                .DDLY(), // 1-bit input: Serial data from IDELAYE2
                .OFB(oserdes_bitslip_reference[gen_index]), // 1-bit input: Data feedback from OSERDESE2
                .OCLKB(), // 1-bit input: High speed negative edge output clock
                .RST(sync_rst), // 1-bit input: Active high asynchronous reset
                // SHIFTIN1-SHIFTIN2: 1-bit (each) input: Data width expansion input ports
                .SHIFTIN1(),
                .SHIFTIN2()
            );
            // End of ISERDESE2_inst instantiation
            
                // OSERDESE2: Output SERial/DESerializer with bitslip
                //7 Series
                // Xilinx HDL Libraries Guide, version 13.4
                OSERDESE2 #(
                    .DATA_RATE_OQ("DDR"), // DDR, SDR
                    .DATA_RATE_TQ("BUF"), // DDR, SDR
                    .DATA_WIDTH(8), // Parallel data width (2-8,10,14)
                    .INIT_OQ(1'b1), // Initial value of OQ output (1'b0,1'b1)
                    .TRISTATE_WIDTH(1)
                )
                OSERDESE2_train(
                    .OFB(oserdes_bitslip_reference[gen_index]), // 1-bit output: Feedback path for data
                    .OQ(), // 1-bit output: Data path output
                    .CLK(i_ddr3_clk), // 1-bit input: High speed clock
                    .CLKDIV(i_controller_clk), // 1-bit input: Divided clock
                    // D1 - D8: 1-bit (each) input: Parallel data inputs (1-bit each)
                    .D1(1'b0),
                    .D2(1'b0),
                    .D3(1'b0),
                    .D4(1'b0),
                    .D5(1'b1),
                    .D6(1'b1),
                    .D7(1'b1),
                    .D8(1'b1),
                    .OCE(1), // 1-bit input: Output data clock enable
                    .RST(sync_rst) // 1-bit input: Reset
                );
                // End of OSERDESE2_inst instantiation  
    
    
        end
     endgenerate 
     
     /*
    // OSERDESE2: Output SERial/DESerializer with bitslip
    //7 Series
    // Xilinx HDL Libraries Guide, version 13.4
    OSERDESE2 #(
        .DATA_RATE_OQ("DDR"), // DDR, SDR
        .DATA_WIDTH(8), // Parallel data width (2-8,10,14)
        .INIT_OQ(1'b1) // Initial value of OQ output (1'b0,1'b1)
    )
    OSERDESE2_train(
        .OFB(test_OFB), // 1-bit output: Feedback path for data
        .OQ(), // 1-bit output: Data path output
        .CLK(i_ddr3_clk), // 1-bit input: High speed clock
        .CLKDIV(i_controller_clk), // 1-bit input: Divided clock
        // D1 - D8: 1-bit (each) input: Parallel data inputs (1-bit each)
        .D1(1'b0),
        .D2(1'b0),
        .D3(1'b0),
        .D4(1'b0),
        .D5(1'b1),
        .D6(1'b1),
        .D7(1'b1),
        .D8(1'b1),
        .OCE(1), // 1-bit input: Output data clock enable
        .RST(sync_rst) // 1-bit input: Reset
    );
    // End of OSERDESE2_inst instantiation  
     */
     /*
    // OSERDESE2: Output SERial/DESerializer with bitslip
    //7 Series
    // Xilinx HDL Libraries Guide, version 13.4
    OSERDESE2 #(
        .DATA_RATE_OQ("DDR"), // DDR, SDR
        .DATA_WIDTH(8), // Parallel data width (2-8,10,14)
        .INIT_OQ(1'b1) // Initial value of OQ output (1'b0,1'b1)
    )
    OSERDESE2_dqs(
        .OFB(oserdes_dqs), // 1-bit output: Feedback path for data
        .OQ(), // 1-bit output: Data path output
        .CLK(i_ddr3_clk), // 1-bit input: High speed clock
        .CLKDIV(i_controller_clk), // 1-bit input: Divided clock
        // D1 - D8: 1-bit (each) input: Parallel data inputs (1-bit each)
        .D1(1'b1 && i_controller_toggle_dqs),
        .D2(1'b0 && i_controller_toggle_dqs),
        .D3(1'b1 && i_controller_toggle_dqs),
        .D4(1'b0 && i_controller_toggle_dqs),
        .D5(1'b1 && i_controller_toggle_dqs),
        .D6(1'b0 && i_controller_toggle_dqs),
        .D7(1'b1 && i_controller_toggle_dqs),
        .D8(1'b0 && i_controller_toggle_dqs),
        .OCE(1), // 1-bit input: Output data clock enable
        .RST(sync_rst) // 1-bit input: Reset
    );
    // End of OSERDESE2_inst instantiation
    */
    // IDELAYCTRL: IDELAYE2/ODELAYE2 Tap Delay Value Control
    // 7 Series
    // Xilinx HDL Libraries Guide, version 13.4
    (* IODELAY_GROUP = 0 *) // Specifies group name for associated IDELAYs/ODELAYs and IDELAYCTRL
    IDELAYCTRL IDELAYCTRL_inst (
        .RDY(o_controller_idelayctrl_rdy), // 1-bit output: Ready output
        .REFCLK(i_ref_clk), // 1-bit input: Reference clock input.The frequency of REFCLK must be 200 MHz to guarantee the tap-delay value specified in the applicable data sheet.
        .RST(sync_rst) // 1-bit input: Active high reset input, To ,Minimum Reset pulse width is 52ns
    );
    // End of IDELAYCTRL_inst instantiation

         
    endmodule