Constraining a dynamic array in UVM sequence

[niks007]

Hi

i will start by explaining my requirement first . Using a UVM sequence my objective is to read data patterns from a file in hexadecimal format line by line and then feed/constrain the data field of my "trans" with data i read.

I am also unaware of the data length as that too can be variable and has to be determined dynamically

here is the code that i have written and that is not working . Need help/hint on same

===================================

virtual task body();

integer file_p, temp;

integer count =0;

reg [7:0] data;

string str;

file_p = $fopen("file.txt","r");

if (!file_p)

begin

`uvm_error("ERROR :","FILE OPENED FAILED :: NO SUCH FILE OR BAD FILE NAME");

end

else

begin

while(!$feof)

begin

temp = $fscanf(file_p,"%s",str);

count = count++;

end

end

$display("Value of Count = %d",count);

`uvm_do_with(trans, {

Addr == addr;

Direction == write;

Length == count;

for (int i = 0; i < count; i++) begin

$fscanf(file_p,"%s",data);

Data == data; // Data is dynamic array

end

})

endtask : body

===========================

Can anybody tell what is wrong i am doing here

i am alos open with same scenario being generated by uvm_create/uvm_send

Thanks

niks007

Edited March 3, 2012 by niks007

[Roman]

Try this one, It should work

for (int i = 0; i < count; i++) begin

$fscanf(file_p,"%s",data);

Data_tmp == data; // Data_tmp is dynamic array

end

`uvm_do_with(trans, {

Addr == addr;

Direction == write;

Length == count;

foreach(Data)

Data inside {Data_tmp};

})

[niks007]

Roman

Thanks for the reply, i thought of this approach, but this approach puts limitation on File Size and memory usage of compiler as i can't use bigger files else my simulator memory will blow up ...

niks007

[Roman]

Here is another way to try.

Why not initialize one global data_tmp[] in testbench layer? Then your sequence will see the data_tmp[].

Then you need not consume the "$fscanf(file_p,"%s",data);" in body of seq.

If your data is very large , and need more time.

You also need add sync signal in vbus_if, and do cfg.wait_for_init_competed() before `uvm_do_with in the seq

Edited March 4, 2012 by Roman

[dave_59]

It would help if you could show the exact format of the file. You say you want to read a hexadecimal formatted file line by line, yet you are reading entire file as a string. Why not use $fgets to read the file a line at a time, and then use $sscanf to convert each line. You can do this just before the `uvm_do