驗證DDS輸出

1、配置DDS的IP

設置輸出位寬和相位位寬，時鐘設置爲100MHz。

設置爲stream

默認

2、添加仿真tb

`timescale 1ns / 100ps

module AA_tb(

    );
	
reg clk;
reg rst_n;

initial
begin
    #0    clk    = 1'b0;
    #2    rst_n  = 1'b0;
    #200  rst_n  = 1'b1; 
end
                                  
always #5   clk = ~clk;

wire [15:0] data1_i,data1_q;
wire	 	data1_valid;  
top top(

 .clk(clk),
 .ad_data(),
 .data1_i(data1_i),  
 .data1_q(data1_q),
 .data1_valid(data1_valid)
);	
integer w_file;
initial w_file = $fopen("F:\data_i.txt");
integer w_file2;
initial w_file2 = $fopen("F:\data_q.txt");
reg [15:0] i =0;
always @ (posedge clk)
begin
	if (!rst_n)
		i <=0;
	else if(data1_valid==1)
		if(i<1024)
		begin
			i <=i+1;
			$fdisplay(w_file,"%d",data1_i);
			$fdisplay(w_file2,"%d",data1_q);
		end
		else 
	   begin
         $fclose(w_file);
         $fclose(w_file2);
     end	   
end

endmodule

頂層文件

module top(

  input                	clk,   		//90MHz
  input	 [15:0]        	ad_data,
  output [15:0]        	data1_i,  	//240k
  output [15:0]        	data1_q,
  output				data1_valid

  
);


wire sys_clk,sys_clkx2;
wire locked,rst_n;

sys_mmcm_clk sys_clk_gen
(
  .clk_in1(clk),    
  .clk_out1(sys_clk),     
  .reset(1'b0),    		 
  .locked(locked) 
);    

reset_gen reset_gen
(
	.aclk(sys_clk),
	.aclk_locked(locked),
	.I_soft_resetn(locked),	
	.aresetn(rst_n)	
);


wire [15:0]  	a_sin,a_cos;
wire 			m_axis_data_tvalid;
wire [31:0] 	m_axis_data_tdata;

assign a_sin = m_axis_data_tdata[31:16]+32768;
assign a_cos = m_axis_data_tdata[15:0]+32768;


assign	data1_i 	= a_sin;
assign	data1_q 	= a_cos;
assign	data1_valid = m_axis_data_tvalid;



dds_compiler_41m4 u_dds_compiler_41m4
(
    .aclk				(sys_clk) ,
	.s_axis_phase_tvalid(rst_n),
	.s_axis_phase_tdata	(32'd536870912),
    .m_axis_data_tvalid	(m_axis_data_tvalid),
    .m_axis_data_tdata	(m_axis_data_tdata)  		
							
);

endmodule

 

3、matlab導入數據驗證

matlab的代碼：

clear;close all;
fs=100e6 ;
N=1024;
n= 0:N-1;
f=n*fs/N;

XREAL  = importdata('data_q.txt');
XIMAG  = importdata('data_i.txt');
XREAL22 = XREAL -32768;
XIMAG22 = XIMAG-32768;
%虛部
 Y = XIMAG22;
fftxx=fft(Y,N);
mag = abs(fftxx);
figure(1),
plot(f,mag);
%實部
 Y2 = XREAL22;
fftxx2=fft(Y2,N);
mag2 = abs(fftxx2);
figure(2),
plot(f,mag2);
%IQ信號
 Y3 =XREAL22 +XIMAG22*1i;
fftxx3=fft(Y3,N);
mag3 = abs((fftxx3));
figure(3),
plot(f,mag3);