How to randomize realtime values in SV/UVM

UVM
,
1

Hi,

Clk is 260 Mhz. Time period is 3.8. I have to use multiples of clk period and give it from testcase and randomize .
How should I randomize realtime values in UVM/SV?

2

In reply to poonamnlwd:

Dou want to use a randomized frequency? Or what is your intention?
BTW you cannot randomize real data types directly. You have to convert them to an integer and reconvert to real.

3

In reply to chr_sue:

Hi,

I want use randomized time for giving delay. and I am giving in like 3.8 ,15.2, time from testcase.

4

In reply to poonamnlwd:

can I do like before randomize use integer and after randomize convert it into real?
But will get values which I want like 3.8,15.2 in driver?

5

In reply to poonamnlwd:

Is it multiples of 3.8 you want to use? Then simply randomize the factor like this:
rand int mult;
Then you can do the following in the driver:

delay = req.mult*3.8;
Or you do prior to randomizing: multiply with 10 and after randomizaion you are dividing by 10.
But I believ you want to select values from a given list in random order. Right?

6

In reply to chr_sue:

In reply to poonamnlwd:
Is it multiples of 3.8 you want to use? Then simply randomize the factor like this:
rand int mult;
Then you can do the following in the driver:
delay = req.mult*3.8;
Or you do prior to randomizing: multiply with 10 and after randomizaion you are dividing by 10.
But I believ you want to select values from a given list in random order. Right?

Sorry for late reply.


  in testcase,
  int delay;
  delay = 15.2 * 10;

  in driver,

  int delay;
  real real_delay;
  
  real_delay = real'(delay/10);

when I am printing value of real_delay, I am getting value 15. 
what can I do so that I will get 15.2 value?
7

In reply to poonamnlwd:

In reply to chr_sue:
Sorry for late reply.


in testcase,
int delay;
delay = 15.2 * 10;
in driver,
int delay;
real real_delay;
real_delay = real'(delay/10);
when I am printing value of real_delay, I am getting value 15. 
what can I do so that I will get 15.2 value?

with your solution I am able to give real delay.

8

In reply to poonamnlwd:

You should check what your time scale and resolution is.

9

In reply to chr_sue:

In reply to poonamnlwd:
You should check what your time scale and resolution is.



  in testcase,
  int delay;
  delay = 15.2 * 10;
 
  in driver,
 
  int delay;
  real real_delay;
 
  real_delay = real/10.0 ;

Its working in above way.