A general purpose unidirectional random stimulus class.
The ovm_random_stimulus class generates streams of T transactions. These streams may be generated by the randomize method of T, or the randomize method of one of its subclasses. The stream may go indefinitely, until terminated by a call to stop_stimulus_generation, or we may specify the maximum number of transactions to be generated.
By using inheritance, we can add directed initialization or tidy up after random stimulus generation. Simply extend the class and define the run task, calling super.run() when you want to begin the random stimulus phase of simulation.
While very useful in its own right, this component can also be used as a template for defining other stimulus generators, or it can be extended to add additional stimulus generation methods and to simplify test writing.
| ovm_random_stimulus #(T) | |||||||||||||||||
| A general purpose unidirectional random stimulus class. | |||||||||||||||||
| Class Hierarchy | |||||||||||||||||
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| Class Declaration | |||||||||||||||||
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| Ports | |||||||||||||||||
| blocking_put_port | The blocking_put_port is used to send the generated stimulus to the rest of the testbench. | ||||||||||||||||
| Methods | |||||||||||||||||
| new | Creates a new instance of a specialization of this class. | ||||||||||||||||
| generate_stimulus | Generate up to max_count transactions of type T. | ||||||||||||||||
| stop_stimulus_generation | Stops the generation of stimulus. | ||||||||||||||||
The blocking_put_port is used to send the generated stimulus to the rest of the testbench.
function new( string name, ovm_component parent )
Creates a new instance of a specialization of this class. Also, displays the random state obtained from a get_randstate call. In subsequent simulations, set_randstate can be called with the same value to reproduce the same sequence of transactions.
virtual task generate_stimulus( T t = null, int max_count = 0 )
Generate up to max_count transactions of type T. If t is not specified, a default instance of T is allocated and used. If t is specified, that transaction is used when randomizing. It must be a subclass of T.
max_count is the maximum number of transactions to be generated. A value of zero indicates no maximum - in this case, generate_stimulus will go on indefinitely unless stopped by some other process
The transactions are cloned before they are sent out over the blocking_put_port
virtual function void stop_stimulus_generation
Stops the generation of stimulus. If a subclass of this method has forked additional processes, those processes will also need to be stopped in an overridden version of this method
The ovm_object class is the base class for all OVM data and hierarchical classes.
virtual class ovm_object extends ovm_void
The ovm_report_object provides an interface to the OVM reporting facility.
class ovm_report_object extends ovm_object
The ovm_component class is the root base class for OVM components.
virtual class ovm_component extends ovm_report_object
A general purpose unidirectional random stimulus class.
class ovm_random_stimulus #( type T = ovm_transaction ) extends ovm_component
Creates a new instance of a specialization of this class.
function new( string name, ovm_component parent )
Generate up to max_count transactions of type T.
virtual task generate_stimulus( T t = null, int max_count = 0 )
Stops the generation of stimulus.
virtual function void stop_stimulus_generation