How to save modelsim simulation data as a file

目的

如何将modelsimThe simulated data is stored as a filematlab分析,In practical engineering applications, we often need to analyze the newly generated data in the simulation process,When the naked eye cannot directly observe the data, it is necessary to save the data as a file and use third-party software for more intuitive analysis.下面分别使用matlab和modelsim联合仿真,将modelsimThe simulation data is saved as a file for usematlab对数据进行分析.

verilog代码

`timescale 1ns/1ps

module testbench();

localparam					LEN	=	8192			;

reg		[15:0]				adc_dat[8191:0]			;
reg							clk						;
reg							rst						;
reg		[12:0]				cnt						;
reg		[15:0]				sim_dat					;
reg		[15:0]				wr_cnt					;

initial	begin
	$readmemh("./adc_dat.bin", adc_dat, 0, LEN-1);
end

initial	begin
	clk		= 0;
	rst		= 1;
	cnt		= 0;
	sim_dat	= 0;
	#1000;
	rst		= 0;
end

always	#2.00	clk	=	~clk						;

[email protected](posedge clk)
begin
	if(rst)	begin
		cnt <= 0;
	end
	else	begin
		cnt		<= cnt + 1;
		sim_dat	<= adc_dat[cnt];
	end
end

integer	fp;
initial	begin
	fp =$fopen("adc_export_dat.bin", "w");
end
[email protected](posedge clk)
begin
	if(rst)	begin
		wr_cnt <=0;
	end
	else	begin
		if(wr_cnt < 8192)	begin
			wr_cnt <=wr_cnt + 1;
		end
		
		if(wr_cnt < 8192)	begin
			$fwrite(fp, "%d\n", $signed(adc_dat[wr_cnt]));
		end
	end
end
endmodule

It can be seen from the code that we directly store the data read from the file as a file（The reading process of the file is described in the previous article如何将matlabGenerate data importmodelsim进行仿真）

matlabAnalysis data code

clc;
clear all;
close all;

adc_dat = load('adc_export_dat.bin');
len = length(adc_dat);

subplot(211);
plot(adc_dat);
subplot(212);
fft_data = abs(fft(adc_dat, len));
fft_data = 20*log10(fft_data);
fft_data = fft_data - max(fft_data);
plot(fft_data);

matlab分析数据结果