User guide

D-38
Compiler Directives and System Tasks
System Tasks for Probabilistic Distribution
$dist_exponential
Returns random numbers where the distribution function is
exponential.
See IEEE std 1364-2001 page 312.
$dist_normal
Returns random numbers with a specified mean and standard
deviation.
See IEEE Std 1364-2001 page 312.
$dist_poisson
Returns random numbers with a specified mean.
See IEEE Std 1364-2001 page 312.
$dist_uniform
Returns random numbers uniformly distributed between
parameters.
See IEEE Std 1364-2001 page 312.
$random
Provides a random number.
See IEEE Std 1364-2001 page 312.
Using this system function in certain kinds of statements might
cause simulation failure. See Avoiding the Debugging Problems
From Port Coercion.
System Tasks for Resetting VCS
$reset
Resets the simulation time to 0. See IEEE Std 1364-2001 pages
741-742.