how the file handling is being used in verilog ?

[Muthuraja.M]

Hi friends,

How to use file handling in verilog ?

I want to read the text file which contains my image values by using verilog.

Pls give me suggestions. reply me with an example...

Thanks in advance....

 

[ads-ee]

Use google "verilog file io" will give you lots of results and examples

 

[Muthuraja.M]

i want to and 2 variables and the result is stored in one txt file this s my code.

I cant get the output in my output txt file.

pls correct my code..

module main(c);
output [7:0]c;
an a1(c);
file f1(c);
endmodule



module file(a);
inout [7:0]a;
integer fd;
initial
begin
fd=$fopen("outfile1.txt");
$fdisplay(fd,"Result is : %b",a);
$fclose(fd);
end
endmodule



module an(d);
parameter a=8'b00011100;
parameter b=8'b00011100;
output [7:0]d;
assign d=a&b;
endmodule

 

[vardan]

Did you simulate the code or just compiled?
It worked for me. If it is simulator specific issue, add timing delay before $fdisplay. Like "#10 $fdisplay..."

Difficult to understand the purpose of the code.
Prefer to do file I/O in the top module.

 

[Muthuraja.M]

i simulate that code but in the txt file it stored as xxxxxxxx. so only i am asking wat is the problem in
my code ...

And i want to know how the array of values are stored in text file...

pls explain me ....

 

[FvM]

inout [7:0]a;

should be input

 

[Muthuraja.M]

no Fvm it should be still xxxxxxxx

- - - Updated - - -

i find fvm i use initial so it has the value in the starting of the simulation i use delay as vardan said or i use always instead of using initial block....


Thanks to both fvm and vardan.....

 

[Muthuraja.M]

hi anyone i need to know how the program is dumped in spartan 3e kit...

i am using xc3s500e device and package is PQ208..

pls send me how to dump the code using xilinx ... i finished upto project creation and check the syntax after that i dont know how to proceed pls help me i am in a hurry....

 

[ads-ee]

i want to and 2 variables and the result is stored in one txt file this s my code.

module file(a);
inout [7:0]a;
integer fd;
initial
begin
fd=$fopen("outfile1.txt");
$fdisplay(fd,"Result is : %b",a);
$fclose(fd);
end
endmodule

You have the $fopen and the $fdisplay in the initial block. The initial block will run at time 0 so you'll only have X's assigned to a. The $fdisplay (and the $fclose) shouldn't be in the initial block unless you add something to trigger the $fdisplay like some wait statement that looks for something to decide when to do the file write.

 

[Muthuraja.M]

yeah rite thank u i understand and i rectify my error in my code.

i have another doubt is primitives are used inside always or initial block ?

pls give me suggestions....