AD9253 LVDS 高速ADC驱动开发

1、查阅AD9253器件手册

2、查阅Xilinx xapp524手册

3、该款ADC工作在125Msps下，14bit - 2Lane - 1frame 模式。

对应：data clock时钟为500M DDR mode。data line rate：1Gbps。frame clock：1/4 data clock

具体内容：下文的参考博客写的很清楚，我就不详细写了。参考博客clock align模块不完整，本文新增这个模块。

`timescale 1ns / 1psmodule bit_clk_align(input  i_clk_p,input  i_clk_n,input  i_clk_200m,input  i_reset,output o_bitclk_align_done,output o_bitclk_Monclk,output o_bitclk_Refclk);//------------------ variable declare ------------------
localparam PHASE_ADJ_FAILED  =  1; // 0: OK   1:FAILEDwire s_BitClk_MonClkOut;
wire s_BitClk_RefClkOut;
wire s_bitclk;
wire s_idelayctrl_rdy;
wire s_bitclk_align_ena;
wire s_IntBitClk;
wire [07:00]s_bitclk_para;
wire [04:00]s_cntvalueout;
reg  r_idelay_ce    = 1;
reg  r_idelay_inc   = 1;reg  [3:0]r_clk_div_reset   = 4'hf;    // high active
wire s_clk_div_reset;
reg  r_phase_adj_status   = 0;
reg  r_bitclk_align_done   = 0;
reg  [03:00] r_adj_cnt = 0;
reg  [03:00] r_bitclk_align_state = 0;
reg  [01:00] s_iserdesout_dly_cnt = 0;//------------------ main body of code ------------------
assign  o_bitclk_Monclk  =  s_BitClk_MonClkOut;
assign  o_bitclk_Refclk  =  s_BitClk_RefClkOut;// generate iserdes reset
always@(posedge s_BitClk_RefClkOut)beginr_clk_div_reset   <= r_clk_div_reset   >> 1;
end
assign s_clk_div_reset = (|r_clk_div_reset);//
// state:  adjust local clock phase align to input clk
//
assign s_bitclk_align_ena = s_idelayctrl_rdy && (~i_reset);
always@(posedge s_BitClk_RefClkOut)begincase(r_bitclk_align_state)0:beginr_idelay_ce  <= 0;r_idelay_inc <= 0;r_phase_adj_status <= 0;r_bitclk_align_done <= 0;if(s_bitclk_align_ena)beginr_bitclk_align_state <= 1;endend1:begin//wait iserdes Q8~Q1 output stablelyr_idelay_ce  <= 0;r_idelay_inc <= 0;if(s_iserdesout_dly_cnt >= 2)begins_iserdesout_dly_cnt <= 0;r_bitclk_align_state <= r_bitclk_align_state + 1;endelse begins_iserdesout_dly_cnt <= s_iserdesout_dly_cnt + 1;endend2:begin// search first patarn// 8'h00 - rising clk align// 8'hff - falling clk alignif(s_bitclk_para == 8'h00)beginr_bitclk_align_state <= 3;endelse beginif(s_cntvalueout == 31)begin// phase adjust flow failedr_idelay_ce  <= 0;r_idelay_inc <= 0;r_phase_adj_status <= PHASE_ADJ_FAILED;endelse beginr_idelay_ce  <= 1;r_idelay_inc <= 1;r_bitclk_align_state <= 1;endendend3:begin// find datain: riding edgeif(s_bitclk_para != 8'h00)beginr_bitclk_align_state <= 5;endelse beginif(s_cntvalueout == 31)begin// phase adjust flow failedr_idelay_ce  <= 0;r_idelay_inc <= 0;r_phase_adj_status <= PHASE_ADJ_FAILED;endelse beginr_idelay_ce  <= 1;r_idelay_inc <= 1;r_bitclk_align_state <= 4;endendend4:begin//wait iserdes Q8~Q1 output stablelyr_idelay_ce  <= 0;r_idelay_inc <= 0;if(s_iserdesout_dly_cnt >= 2)begins_iserdesout_dly_cnt <= 0;r_bitclk_align_state <= 3;endelse begins_iserdesout_dly_cnt <= s_iserdesout_dly_cnt + 1;endend5:begin// adjust s_cntvalueout: -1r_idelay_ce  <= 1;r_idelay_inc <= 0;r_bitclk_align_state <= 6;end6:beginr_idelay_ce  <= 0;r_idelay_inc <= 0;r_bitclk_align_done  <= 1;r_bitclk_align_state <= 6;enddefault:r_bitclk_align_state = 0;endcase
endassign  o_bitclk_align_done  =  r_bitclk_align_done;//
//
//
IBUFDS #(.IOSTANDARD("LVDS_25")     // Specify the input I/O standard) IBUFDS_inst (.O(s_bitclk),  // Buffer output.I(i_clk_p),  // Diff_p buffer input (connect directly to top-level port).IB(i_clk_n) // Diff_n buffer input (connect directly to top-level port));(* IODELAY_GROUP = "bitclk_group" *) // Specifies group name for associated IDELAYs/ODELAYs and IDELAYCTRLIDELAYCTRL IDELAYCTRL_inst (.RDY(s_idelayctrl_rdy),       // 1-bit output: Ready output.REFCLK(i_clk_200m), // 1-bit input: Reference clock input.RST(1'b0)        // 1-bit input: Active high reset input);IDELAYE2 #(.CINVCTRL_SEL("FALSE"),          // Enable dynamic clock inversion (FALSE, TRUE).DELAY_SRC("IDATAIN"),           // Delay input (IDATAIN, DATAIN).HIGH_PERFORMANCE_MODE("TRUE"), // Reduced jitter ("TRUE"), Reduced power ("FALSE").IDELAY_TYPE("VARIABLE"),           // FIXED, VARIABLE, VAR_LOAD, VAR_LOAD_PIPE.IDELAY_VALUE(0),                // 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, 290.0-310.0)..SIGNAL_PATTERN("CLOCK")          // DATA, CLOCK input signal)IDELAYE2_inst (.CNTVALUEOUT(s_cntvalueout), // 5-bit output: Counter value output.DATAOUT(s_IntBitClk),         // 1-bit output: Delayed data output.C(s_BitClk_RefClkOut),                     // 1-bit input: Clock input.CE(r_idelay_ce),                   // 1-bit input: Active high enable increment/decrement input.CINVCTRL(1'b0),       // 1-bit input: Dynamic clock inversion input.CNTVALUEIN(5'd0),   // 5-bit input: Counter value input.DATAIN(1'b0),           // 1-bit input: Internal delay data input.IDATAIN(s_bitclk),         // 1-bit input: Data input from the I/O.INC(r_idelay_inc),                 // 1-bit input: Increment / Decrement tap delay input.LD(0),                   // 1-bit input: Load IDELAY_VALUE input.LDPIPEEN(1'b0),       // 1-bit input: Enable PIPELINE register to load data input.REGRST(0)            // 1-bit input: Active-high reset tap-delay input);BUFIO BUFIO_inst (.O(s_BitClk_MonClkOut), // 1-bit output: Clock output (connect to I/O clock loads)..I(s_IntBitClk)  // 1-bit input: Clock input (connect to an IBUF or BUFMR).);BUFR #(.BUFR_DIVIDE("4"),   // Values: "BYPASS, 1, 2, 3, 4, 5, 6, 7, 8" .SIM_DEVICE("7SERIES")  // Must be set to "7SERIES" )BUFR_inst (.O(s_BitClk_RefClkOut),     // 1-bit output: Clock output port.CE(1),   // 1-bit input: Active high, clock enable (Divided modes only).CLR(0), // 1-bit input: Active high, asynchronous clear (Divided modes only).I(s_IntBitClk)      // 1-bit input: Clock buffer input driven by an IBUF, MMCM or local interconnect);ISERDESE2 #(.DATA_RATE         ("SDR"), // DDR, SDR
//    .DATA_RATE         ("DDR"), // DDR, SDR.DATA_WIDTH        (8), // Parallel data width (2-8,10,14).DYN_CLKDIV_INV_EN ("FALSE"), // Enable DYNCLKDIVINVSEL inversion (FALSE, TRUE).DYN_CLK_INV_EN    ("FALSE"), // Enable DYNCLKINVSEL inversion (FALSE, TRUE)// 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          ("IBUF"), // NONE, BOTH, IBUF, IFD.IOBDELAY          ("NONE"), // NONE, BOTH, IBUF, IFD.NUM_CE            (1), // Number of clock enables (1,2).OFB_USED          ("FALSE"), // Select OFB path (FALSE, TRUE).SERDES_MODE       ("MASTER"), // MASTER, SLAVE// 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_inst1(.O            (), // 1-bit output: Combinatorial output// Q1 - Q8: 1-bit (each) output: Registered data outputs.Q1           (s_bitclk_para[0]),.Q2           (s_bitclk_para[1]),.Q3           (s_bitclk_para[2]),.Q4           (s_bitclk_para[3]),.Q5           (s_bitclk_para[4]),.Q6           (s_bitclk_para[5]),.Q7           (s_bitclk_para[6]),.Q8           (s_bitclk_para[7]),// SHIFTOUT1, SHIFTOUT2: 1-bit (each) output: Data width expansion output ports.SHIFTOUT1    (),.SHIFTOUT2    (),.BITSLIP      (0), // 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'b1),.CE2          (1'b0),.CLKDIVP      (1'b0), // 1-bit input: TBD// Clocks: 1-bit (each) input: ISERDESE2 clock input ports.CLK          (s_BitClk_MonClkOut), // 1-bit input: High-speed clock.CLKB         (0), // 1-bit input: High-speed secondary clock.CLKDIV       (s_BitClk_RefClkOut), // 1-bit input: Divided clock.OCLK         (1'b0), // 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'b0), // 1-bit input: Dynamic CLKDIV inversion.DYNCLKSEL    (1'b0), // 1-bit input: Dynamic CLK/CLKB inversion// Input Data: 1-bit (each) input: ISERDESE2 data input ports.D            (s_bitclk), // 1-bit input: Data input
//    .DDLY         (s_IntBitClk), // 1-bit input: Serial data from IDELAYE2.DDLY         (0), // 1-bit input: Serial data from IDELAYE2.OFB          (1'b0), // 1-bit input: Data feedback from OSERDESE2.OCLKB        (1'b0), // 1-bit input: High speed negative edge output clock
//    .RST          (i_reset), // 1-bit input: Active high asynchronous reset.RST          (s_clk_div_reset ), // 1-bit input: Active high asynchronous reset// SHIFTIN1, SHIFTIN2: 1-bit (each) input: Data width expansion input ports.SHIFTIN1     (1'b0),.SHIFTIN2     (1'b0)
);// note：ISERDES/OSERDES需要复位，才会生效。
// 虽然支持异步复位，但是推荐用CLKDIV这个时钟来进行同步复位，或采用异步复位同步释放。
// 即.RST          (i_reset), // 1-bit input: Active high asynchronous reset
// i_reset可以替换为由s_BitClk_RefClkOut来内部逻辑产生s_clk_div_reset 。endmodule

补充知识：

• OSERDES2原语

• ISERDES2原语

参考博客：

LVDS接口程序设计框架及仿真_lvds接口仿真-CSDN博客

xilinx原语详解及仿真——OSERDESE2 - 知乎 (zhihu.com)