uvm callback

UVM callback is an object-oriented programming technique used in the Universal Verification Methodology (UVM) to enable communication between different components of a UVM-based verification environment.

In UVM, a callback is a user-defined function that is executed automatically when a particular event occurs during the simulation. These events can include the creation or destruction of an object, the start or end of a simulation phase, or the occurrence of a specific transaction or signal.

Callbacks are implemented using the UVM callback mechanism, which provides a standardized way for different components of a UVM environment to register their interest in specific events and to be notified when those events occur.

Callbacks can be used to perform a variety of tasks, such as collecting and analyzing data, modifying the behavior of a component, or triggering other events in the simulation. They are an important tool for building flexible and extensible verification environments in UVM.