Randomization

July 20, 2024 || Item:7.1.Randomization

Randomization allows for the creation of random stimulus, which is critical for thorough testing and coverage of all possible scenarios. 

1. Random variable:

Variables can be declared as random using the rand and randc keywords.

   rand: generates random values with repetition.

   randc: generates random values without repetition (cyclic).

2. Random method: 

The randomize() method is used to generate random values for the random variables.

The pre_randomize() and post_randomize() are callback functions which will be automatically called right before/after function randomize().

The rand_mode() method is used to ENABLE or DISABLE the randomization of specific random variables or all random variables of class. 

   rand_mode(0) disables randomization.

   rand_mode(1) enables randomization.

3. Example:

Output

4. System random function: 

$urandom(seed): generate 32-bits unsigned value. "seed" is optional. 

$random(seed): generate 32-bits signed value. "seed" is also optional.

$random_range(int unsgined max_value, int unsigned min_value = 0): generate 32-bits unsigned value within the specificed range. 

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