Importing data into ModelSim

[Altera_Forum]

Is it possible to import arbitrary data into ModelSim (Altera web version)?  

 I would like to evaluate the frequency response of a filter. I don't see how I could generate a signal having a particular frequency within a test bench. Each test frequency would require at least 200 samples.   It would be simple to do if I could read the test data from a file.

[Altera_Forum]

You can either read text file or generate data stream directly in testbench. 

 Here is example of reading text file:  -- read input stimulus process(reset,clk) file file_in : text open read_mode is "filename.txt"; variable line_in : line; variable input_tmp : integer := 0; begin if(reset = '1')then data_in <= (others => '0'); elsif(rising_edge(clk))then if not endfile(file_in)then readline(file_in,line_in); read(line_in,input_tmp); data_in <= std_logic_vector(to_signed(input_tmp,16)); end if; end if; end process;

[Altera_Forum]

if its a sine wave or other mathmatical function, why not write a function for it/

[Altera_Forum]

If he's using VHDL, the ieee.math_real package has them. 

If he's using Verilog.. it's uglier, he has to use PLI or equivalent.

[Altera_Forum]

DSP Builder is a nice tool for this. It automatically converts Matlab stimuli to separate input files and generates the Modelsim testbench.

[Altera_Forum]

--- Quote Start ---  if its a sine wave or other mathmatical function, why not write a function for it/  --- Quote End ---     I'm using Verilog; is that possible. If so, how?