The uvm_event_callback class is an abstract class that is used to create callback objects which may be attached to uvm_event#(T)s. 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.
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| The uvm_event_callback class is an abstract class that is used to create callback objects which may be attached to uvm_event#(T)s. | |||||||||||||||||
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| Class Declaration | |||||||||||||||||
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| 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#(T) e, T data )
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#(T) that is being triggered, and data is the optional data associated with the event trigger.
virtual function void post_trigger ( uvm_event#(T) e, T data )
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#(T) that is being triggered, and data is the optional data associated with the event trigger.
The uvm_void class is the base class for all UVM classes.
virtual class uvm_void
The uvm_object class is the base class for all UVM data and hierarchical classes.
virtual class uvm_object extends uvm_void
The uvm_callback class is the base class for user-defined callback classes.
class uvm_callback extends uvm_object
The uvm_event_callback class is an abstract class that is used to create callback objects which may be attached to uvm_event#(T)s.
virtual class uvm_event_callback#( type T = uvm_object ) extends uvm_callback
This is an implementation of uvm_event#(T) as described in 1800.2 with the addition of API described below.
class uvm_event#( type T = uvm_object ) extends uvm_event_base
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#(T) e, T data )
This callback is called after triggering the associated event.
virtual function void post_trigger ( uvm_event#(T) e, T data )