CODEWITHSUNDEEP
file-iosystem-verilogverificationquestasim
Андрей Кущенко
Андрей Кущенко

Reputation: 21

binary write SystemVerilog

I tried write binary file in SystemVerilog in my testbench. 

int file   = $fopen(path,"w");
if (!file) begin
    $error("File could not be open: ", path);
    return;
end
$fwrite(file, "%u", 32'h4D424D42);
$fclose(file);

And get result: 02 0c 02 0c

I use QuestaSum 10.2c. Why i get this result? Thanks.

Upvotes: 1

Views: 8307

Answers (1)

Rahul Menon
Rahul Menon

Reputation: 792

%u puts raw unformatted binary data into the file. Do not expected it to be in readable format. Ensure that you are opening the file in binary format "rb" or "wb" ... .Try reading back the binary data and that should show the written value.

You can use %z if you want to save 4 state values. 

int rd;
int file   = $fopen(path,"wb"); // open in binary mode
if (!file) begin
    $error("File could not be open: ", path);
    return;
end
$fwrite(file, "%u", 32'h4D424D42);
$fclose(file);
 // read back binary data from file 
file = $fopen (path,"rb");  // open in binary mode
if (!file) begin
    $error("File could not be open: ", path);
    return;
end
$fscanf(file,"%u",rd);
$fclose(file);
$display("%h",rd);

Upvotes: 5

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