[Verilog] How to save data to a file?

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davyzhu

Joined: 23 May 2004
Posts: 521
Helped: 3
Location: oriental

06 Jul 2005 3:41 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

zeese

Joined: 21 May 2002
Posts: 27
Helped: 1

06 Jul 2005 4:01 verilog $fwrite

Quote:

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

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]

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eeeraghu

Joined: 03 Jun 2005
Posts: 215
Helped: 17

06 Jul 2005 7:50 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

echo47

Joined: 07 Apr 2002
Posts: 4206
Helped: 566

06 Jul 2005 8:03 $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.

dearjohn

Joined: 08 Jun 2005
Posts: 9
Helped: 1

06 Jul 2005 9:46 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