58--FPGA vivado 两路信号相位差估算

DDS1:20.915MHz，相位偏移为0
DDS2：20.915MHz，相位偏移为pi（可调）
DDS3：20MHz
实验任务：求DDS2和DDS1两路信号的相位差

低通滤波器：
coe文件：
; XILINX CORE Generator™Distributed Arithmetic FIR filter coefficient (.COE) File
; Generated by MATLAB® 9.2 and the DSP System Toolbox 9.4.
; Generated on: 11-Jun-2020 10:12:58
Radix = 16;
Coefficient_Width = 16;
CoefData = 03c3,
0e4e,
2211,
3cd8,
5755,
67f6,
67f6,
5755,
3cd8,
2211,
0e4e,
03c3;

f1=20.915MHz，
f0=20MHz


`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company: 
// Engineer: 
// 
// Create Date: 2020/06/10 17:13:03
// Design Name: 
// Module Name: lpfct
// Project Name: 
// Target Devices: 
// Tool Versions: 
// Description: 
// 
// Dependencies: 
// 
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
// 
//////////////////////////////////////////////////////////////////////////////////


module lpfct(
    input clk,
    input s_axis_config_tvalid_dds2,
    input s_axis_data_tvalid_fir,
    input [15:0]poff2,
    input s_axis_cartesian_tvalid,
    output [31:0]multda1,
    output [31:0]multda2,
    output [39:0]firout1,
    output [39:0]firout2,
    output [39:0]firout3,
    output [39:0]firout4,
    output [15:0]ct1,
    output [15:0]ct2,
    output [16:0]obj,

    output reg [16:0]fix_down
    );
    wire [15:0]cos1,cos2,cos3,sin3;
    wire [31:0]multda3,multda4;
    wire m_axis_phase_tvalid_dds1;
    wire m_axis_data_tvalid_dds1;
    wire [15:0]m_axis_phase_tdata_dds1;
    dds1 your_instance_name (
  .aclk(clk),                                // input wire aclk
  .m_axis_data_tvalid( m_axis_data_tvalid_dds1),    // output wire m_axis_data_tvalid
  .m_axis_data_tdata(cos1),      // output wire [15 : 0] m_axis_data_tdata
  .m_axis_phase_tvalid(m_axis_phase_tvalid_dds1),  // output wire m_axis_phase_tvalid
  .m_axis_phase_tdata(m_axis_phase_tdata_dds1)    // output wire [15 : 0] m_axis_phase_tdata
);


wire m_axis_data_tvalid_dds2;
dds2 dds_2 (
  .aclk(clk),                                  // input wire aclk
  .s_axis_config_tvalid(s_axis_config_tvalid_dds2),  // input wire s_axis_config_tvalid
  .s_axis_config_tdata(poff2),    // input wire [15 : 0] s_axis_config_tdata
  .m_axis_data_tvalid(m_axis_data_tvalid_dds2),      // output wire m_axis_data_tvalid
  .m_axis_data_tdata(cos2)        // output wire [15 : 0] m_axis_data_tdata
);

/*dds2 ddds(
  .aclk(clk),                              // input wire aclk
  .m_axis_data_tvalid(m_axis_data_tvalid_dds2),  // output wire m_axis_data_tvalid
  .m_axis_data_tdata(cos2)    // output wire [15 : 0] m_axis_data_tdata
);*/
wire m_axis_data_tvalid_dds3sin;
wire m_axis_data_tvalid_dds3cos;
wire m_axis_phase_tvalid_sin3;
wire m_axis_phase_tvalid_cos3;
wire [15:0]m_axis_phase_tdata_sin3;

dds3_sin  abc(
  .aclk(clk),                                // input wire aclk
  .m_axis_data_tvalid(m_axis_data_tvalid_dds3sin),    // output wire m_axis_data_tvalid
  .m_axis_data_tdata(sin3),      // output wire [15 : 0] m_axis_data_tdata
  .m_axis_phase_tvalid(m_axis_phase_tvalid_sin3),  // output wire m_axis_phase_tvalid
  .m_axis_phase_tdata(m_axis_phase_tdata_sin3)    // output wire [15 : 0] m_axis_phase_tdata
);
wire m_axis_data_tvalid_sin3;
dds_3cos abc2 (
  .aclk(clk),                              // input wire aclk
  .m_axis_data_tvalid(m_axis_data_tvalid_dds3cos),  // output wire m_axis_data_tvalid
  .m_axis_data_tdata(cos3)    // output wire [15 : 0] m_axis_data_tdata
);
mult_gen_0 mult (
  .CLK(clk),  // input wire CLK
  .A(cos1),      // input wire [15 : 0] A
  .B(cos3),      // input wire [15 : 0] B
  .P(multda1)      // output wire [31 : 0] P
);
mult_gen_0 mult2 (
  .CLK(clk),  // input wire CLK
  .A(cos1),      // input wire [15 : 0] A
  .B(-sin3+1'b1),      // input wire [15 : 0] B
  .P(multda2)      // output wire [31 : 0] P
);
mult_gen_0 mult3 (
  .CLK(clk),  // input wire CLK
  .A(cos2),      // input wire [15 : 0] A
  .B(cos3),      // input wire [15 : 0] B
  .P(multda3)      // output wire [31 : 0] P
);
mult_gen_0 mult4 (
  .CLK(clk),  // input wire CLK
  .A(cos2),      // input wire [15 : 0] A
  .B(-sin3+1'b1),      // input wire [15 : 0] B
  .P(multda4)      // output wire [31 : 0] P
);
wire s_axis_data_tready_fir1,s_axis_data_tready_fir2,s_axis_data_tready_fir3,s_axis_data_tready_fir4;
wire m_axis_data_tvalid_fir1,m_axis_data_tvalid_fir2,m_axis_data_tvalid_fir3,m_axis_data_tvalid_fir4;
fir_compiler_0 fir1 (
  .aclk(clk),                              // input wire aclk
  .s_axis_data_tvalid(s_axis_data_tvalid_fir),  // input wire s_axis_data_tvalid
  .s_axis_data_tready(s_axis_data_tready_fir1),  // output wire s_axis_data_tready
  .s_axis_data_tdata(multda1[30:15]),    // input wire [15 : 0] s_axis_data_tdata
  .m_axis_data_tvalid(m_axis_data_tvalid_fir1),  // output wire m_axis_data_tvalid
  .m_axis_data_tdata(firout1)    // output wire [39 : 0] m_axis_data_tdata
);
fir_compiler_0 fir2 (
  .aclk(clk),                              // input wire aclk
  .s_axis_data_tvalid(s_axis_data_tvalid_fir),  // input wire s_axis_data_tvalid
  .s_axis_data_tready(s_axis_data_tready_fir2),  // output wire s_axis_data_tready
  .s_axis_data_tdata(multda2[30:15]),    // input wire [15 : 0] s_axis_data_tdata
  .m_axis_data_tvalid(m_axis_data_tvalid_fir2),  // output wire m_axis_data_tvalid
  .m_axis_data_tdata(firout2)    // output wire [39 : 0] m_axis_data_tdata
);
fir_compiler_0 fir3 (
  .aclk(clk),                              // input wire aclk
  .s_axis_data_tvalid(s_axis_data_tvalid_fir),  // input wire s_axis_data_tvalid
  .s_axis_data_tready(s_axis_data_tready_fir3),  // output wire s_axis_data_tready
  .s_axis_data_tdata(multda3[30:15]),    // input wire [15 : 0] s_axis_data_tdata
  .m_axis_data_tvalid(m_axis_data_tvalid_fir3),  // output wire m_axis_data_tvalid
  .m_axis_data_tdata(firout3)    // output wire [39 : 0] m_axis_data_tdata
);
fir_compiler_0 fir4 (
  .aclk(clk),                              // input wire aclk
  .s_axis_data_tvalid(s_axis_data_tvalid_fir),  // input wire s_axis_data_tvalid
  .s_axis_data_tready(s_axis_data_tready_fir4),  // output wire s_axis_data_tready
  .s_axis_data_tdata(multda4[30:15]),    // input wire [15 : 0] s_axis_data_tdata
  .m_axis_data_tvalid(m_axis_data_tvalid_fir4),  // output wire m_axis_data_tvalid
  .m_axis_data_tdata(firout4)    // output wire [39 : 0] m_axis_data_tdata
);
wire m_axis_dout_tvalid_cor1,m_axis_dout_tvalid_cor2;
cordic_0 cor1 (
  .aclk(clk),                                        // input wire aclk
  .s_axis_cartesian_tvalid(s_axis_cartesian_tvalid),  // input wire s_axis_cartesian_tvalid
  .s_axis_cartesian_tdata({firout2[39:24],firout1[39:24]}),    // input wire [31 : 0] s_axis_cartesian_tdata
  .m_axis_dout_tvalid(m_axis_dout_tvalid_cor1),            // output wire m_axis_dout_tvalid
  .m_axis_dout_tdata(ct1)              // output wire [15 : 0] m_axis_dout_tdata
);
cordic_0 cor2 (
  .aclk(clk),                                        // input wire aclk
  .s_axis_cartesian_tvalid(s_axis_cartesian_tvalid),  // input wire s_axis_cartesian_tvalid
  .s_axis_cartesian_tdata({firout4[39:24],firout3[39:24]}),    // input wire [31 : 0] s_axis_cartesian_tdata
  .m_axis_dout_tvalid(m_axis_dout_tvalid_cor2),            // output wire m_axis_dout_tvalid
  .m_axis_dout_tdata(ct2)              // output wire [15 : 0] m_axis_dout_tdata
);

c_addsub_0 sub (
  .A(ct2),      // input wire [15 : 0] A
  .B(ct1),      // input wire [15 : 0] B
  .CLK(clk),  // input wire CLK
  .S(obj)      // output wire [16 : 0] S
);






always@(posedge clk)begin
if(obj[16]==1'b0)
begin
    if(obj==17'd0)begin
     fix_down <= 17'b0;
     end
     else begin
        fix_down<=obj;
     end
end
else begin
    if(obj[15:0]>16'b011_0010_1111_1000)begin
      fix_down <= 17'b0011_0010_0100_00001 + obj+ 17'b0011_0010_0100_00001;
    end
end
end



endmodule

```csharp
`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company: 
// Engineer: 
// 
// Create Date: 2020/06/10 18:31:33
// Design Name: 
// Module Name: tbtst
// Project Name: 
// Target Devices: 
// Tool Versions: 
// Description: 
// 
// Dependencies: 
// 
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
// 
//////////////////////////////////////////////////////////////////////////////////


module tbtst(
    );
     
    reg clk;
    reg s_axis_config_tvalid_dds2;
    reg s_axis_data_tvalid_fir;
    reg [15:0]poff2;
    reg s_axis_cartesian_tvalid;
    wire [31:0]multda2;
    wire [31:0]multda1;
    wire [39:0]firout1;
     wire [39:0]firout2;
      wire [39:0]firout3;
       wire [39:0]firout4;
       wire [15:0]ct1,ct2;
       wire  [16:0]obj;
       wire [16:0]fix_down;
    lpfct u1(.clk(clk),.s_axis_config_tvalid_dds2(s_axis_config_tvalid_dds2),.poff2(poff2),
    .multda2(multda2),.multda1(multda1),.s_axis_data_tvalid_fir(s_axis_data_tvalid_fir),.firout1(firout1),
    .firout2(firout2),.firout3(firout3),.firout4(firout4),.s_axis_cartesian_tvalid(s_axis_cartesian_tvalid),
    .ct1(ct1),.ct2(ct2),.obj(obj),.fix_down(fix_down)
    );
    initial begin
    clk<=1'b0;
    s_axis_config_tvalid_dds2<=1'b1;
    s_axis_data_tvalid_fir<=1'b1;
    s_axis_cartesian_tvalid<=1'b1;
   poff2<=16'd32768;
 #60000  poff2<=16'd16384;
    end
   always #5 clk<=~clk;
endmodule

仿真波形：

相位控制字为2^15时(相位宽度为16)，相位差为0011.0010001101001=3.1378,接近pi

相位控制字为2^14时，相位差为1.56与pi/2=1.57相近。

文章参考

https://blog.csdn.net/qq_39809425/article/details/94211249

我是仿照这篇博客来完成的…不过原理分析是按照更简易的数学方法来写的。