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[Verilog] How to save data to a file?

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davyzhu

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verilog fwrite

Hi all,
I want to save data to a file. And I use $fopen, %fwrite, %fclose. But I found these function only can be called in initial block. When I use them outside initial block, the compiler report errors??

I want to use it in a for block, how?
I use Modelsim 5.6.

Any suggestions will be appreciated!

//-------------------
module tb;
integer os1;
initial
begin
os1 = $fopen("E:\\tb.txt");
$fwrite(os1,"aaaaaaaaaaaa");
$fclose(os1);
end
endmodule
//-------------------

Best regards,
Davy
 

verilog $fwrite

I want to use it in a for block, how?
Click to expand...

I don't get your question. Do you mean to use it in a "for loop"?

Even for loop, you may need to write it in an initial block.

initial
begin
for (i=0;i<5;i=i+1)
$fwrite(osi, "aaa");
end

Or, you can use it in always block, something like this

always @ (posedge clk)
begin
if (data_ready)
$fwriteh(osi, "%h",datain);
end[/quote]
 

    D

    davyzhu

    Points: 2
    Helpful Answer Positive Rating
fwrite verilog

How about declaring the output i.e writing in seperate always block noting the output, and the function in a seperate i.e applying stimulus in another intitial using the for loop


initial begin
alu_chann = $fopen("alu.log"); if(!alu_chann) $finish;
end

// the given function stimulus.

always @(posedge clock) // print to alu.log
$fdisplay(alu_chann, "acc= %h f=%h a=%h b=%h",acc,f,a,b);

regards raghu
 

    D

    davyzhu

    Points: 2
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$fwrite verilog

davyzhu, show us your code that's not working.

ModelSim 6.0c lets me put $fopen, $fwrite, and $fclose inside initial blocks, outside initial blocks, inside for loops, wherever I want.
 

fwrite in verilog

module tb;
integer os1;
initial
begin
os1 = $fopen("E:\\tb.txt");
//$fwrite(os1,"aaaaaaaaaaaa");
//$fclose(os1);
end

always
begin
$fwrite(os1,"aaaaaaaaaaaa");
end

endmodule
//-------------------

Best regards,
Davy
 

    D

    davyzhu

    Points: 2
    Helpful Answer Positive Rating
$fwrite in verilog

No errors here. Runs fine. In a few seconds I had a file with hundreds of megabytes of a's.
Maybe you need a newer ModelSim.
 

    D

    davyzhu

    Points: 2
    Helpful Answer Positive Rating
verilog fclose

Hi all,

Thanks! I have done it by your methods!
And anyone used Chris Spear's PLI, is it powerful?

Best regards,
Davy
 

modelsim $fopen

put fwrite in always
 

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