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storing values from vhdl wave

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my output values are displayed in vhdl wave window. I s there any possible way to store values directly from this wave window ???
 

In what sense? Modelsim will store the whole waveform file for you during a simulation run.
If you're trying to store a trace to a text file for stimulus later, you will need to do that in your VHDL code.
 
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i need to store the values in text file. Is it not possible directly from the waveform itself ?



since all values are in sfixed format, it will be very difficult....
 

what are you trying to do? it is pretty straightoforward to store numbers in a text file as the fixed_pkg provides the to_string function for the sfixed type.
If you want to store it as a decimal number, you can easily convert it to real:

Code VHDL - [expand]
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library ieee;
use ieee.std_logic_1164.all;
use ieee.fixed_pkg.all;
 
entity str_test is
end entity str_test;
 
architecture test of str_test is
begin
    process
        variable a : sfixed(3 downto -4) := b"1101_1100";
    begin
        report "literal is " & to_string(a);
        report "real is " & real'image(to_real(a));
        wait;
    end process;
 
end architecture test;


Code: 
# ** Note: literal is 1101.1100
#    Time: 0 ps  Iteration: 0  Instance: /str_test
# ** Note: real is -2.250000e+000
#    Time: 0 ps  Iteration: 0  Instance: /str_test
 

A simple way to dump values of specific signals in a text file is by using a list window.
 

I want to write the values(sfixed ) in text file
 

214 said:
I want to write the values(sfixed ) in text file
Click to expand...

The code in post #4 shows how to convert sfixed to string as a binary or as a real type. There are many TEXTIO tutorials on the web, and writing sfixed to a file is a simple extension on this.
 

but how it will be saved in my system.... in which format. I want the output values in text file. so that i can reconstruct it in MATLAB
 

214 said:
but how it will be saved in my system.... in which format. I want the output values in text file. so that i can reconstruct it in MATLAB
Click to expand...

using TEXTIO you store it as a text file. How you format it is up to you (by how you write your code).
 

TrickyDicky said:
using TEXTIO you store it as a text file. How you format it is up to you (by how you write your code).
Click to expand...

can u please write a sample code for me.... I am really stuck with this kind of output values. thanks in advance
 

Using the code I did in #4

Code VHDL - [expand]
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library ieee;
use ieee.std_logic_1164.all;
use ieee.fixed_pkg.all;
 
entity str_test is
end entity str_test;
 
architecture test of str_test is
begin
    process
        file f : text open write_mode is "some_file.txt";
        variable l : line;
        variable a : sfixed(3 downto -4) := b"1101_1100";
    begin
        write(l, "literal is " & to_string(a) & lf);
        write(l, "real is " & real'image(to_real(a)) );
        writeline(f, l);
 
        wait;
    end process;
 
end architecture test;


I highly recommend YOU look up a textio tutorial - there are plenty on google.
 

What if i have more data and we have to write them in one single line(like 100 sfixed values) and after every 10 values we have to put a comma sign
 

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