How to enter "n" number of elements in a queue (array)?

UVM
,
1

Hi all,

With regards to the UVM Environment, I have two file;

testcase.svh and sequence.svh

In sequence.svh, I have one declaration and task;

///////////////////////////////////////

typedef byte_t data_payload;

USB_OUT_TASK (

 input a,
 input byte_t data_payload[],
 etc....

);
/////////////////////////////////////

In testcase.svh, I need to use this data_payload to enter number of elements;

////////////////////////////////////////

bit [7:0] data_payload;

task body();

USB_OUT_TASK (
.a(a),
.data_payload(data_payload),
etc…)

endtask

///////////////////////////////////////////

Where data_payload is the variable that defines the number of elements that I need to write to the testcase. By default, if we run the testcase, number of elements written will be zero.

case1: bit [7:0] data_payload = {'h01, 'h02, 'h03};
OUTPUT: 3 elements

case2: bit [7:0] data_payload [0:3] = {'h01, 'h02, 'h03, 'h04};
OUTPUT: It shows 4 elements what we have written

Now, if I want to write 500 elements, I should write;
bit [7:0] data_payload = {'h01, 'h02, 'h03, 'h04, … till 500 elements…};
and the testcase becomes too lengthy, everytime I need to enter manually.

Can anyone suggest how to include a mechanism so that If I just mention as 100 to any variable, it should write 100 elements. Because I need to verify the scenario for 1000, 5000 etc…

I have tried parameter method, declaring for loops, using $urandom_range etc… but I couldn’t get control over this. Kindly show me the example for this.

2

In reply to Mahesh K:

You can randomize the data_payload field as follows to generate any number of elements as you want :


std::randomize(data_payload) with { data_payload.size() == 5000; };
3

In reply to sharat:

data_payload is a dynamic array. You have to construct this. There aare 2 ways to do this:
(1) calling the constructor new: data_payload = new[500]; constructs you an array with 500 entries.
(2) impicit construction by using an assignment pattern: data_payload = '{'h01, 'h02, …};

4

In reply to chr_sue:

Thank you all. Both the method works fine. I got expected output.