The uvm_event_callback class is an abstract class that is used to create callback objects which may be attached to uvm_events. To use, you derive a new class and override any or both pre_trigger and post_trigger.
Callbacks are an alternative to using processes that wait on events. When a callback is attached to an event, that callback object’s callback function is called each time the event is triggered.
| uvm_event_callback | ||||
| The uvm_event_callback class is an abstract class that is used to create callback objects which may be attached to uvm_events. | ||||
| Class Hierarchy | ||||
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| Class Declaration | ||||
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| Methods | ||||
| new | Creates a new callback object. | |||
| pre_trigger | This callback is called just before triggering the associated event. | |||
| post_trigger | This callback is called after triggering the associated event. | |||
virtual function bit pre_trigger ( uvm_event e, uvm_object data = null )
This callback is called just before triggering the associated event. In a derived class, override this method to implement any pre-trigger functionality.
If your callback returns 1, then the event will not trigger and the post-trigger callback is not called. This provides a way for a callback to prevent the event from triggering.
In the function, e is the uvm_event that is being triggered, and data is the optional data associated with the event trigger.
virtual function void post_trigger ( uvm_event e, uvm_object data = null )
This callback is called after triggering the associated event. In a derived class, override this method to implement any post-trigger functionality.
In the function, e is the uvm_event that is being triggered, and data is the optional data associated with the event trigger.
The uvm_object class is the base class for all UVM data and hierarchical classes.
virtual class uvm_object extends uvm_void
The uvm_event_callback class is an abstract class that is used to create callback objects which may be attached to uvm_events.
virtual class uvm_event_callback extends uvm_object
The uvm_event class is a wrapper class around the SystemVerilog event construct.
class uvm_event extends uvm_object
Creates a new callback object.
function new ( string name = "" )
This callback is called just before triggering the associated event.
virtual function bit pre_trigger ( uvm_event e, uvm_object data = null )
This callback is called after triggering the associated event.
virtual function void post_trigger ( uvm_event e, uvm_object data = null )