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Usage of heartbeat in UVM to terminate simulation

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here are some examples (the developer tests)


basically the heartbeat raises an error if there is no "ping" from a set of objects(configurable) within a window. the window is defined by trigger events of an uvm_event used to configure the heartbeat. the set of objects is determined by the <hb>.add() calls. the notification of the "ping" (the "i-am-alive-message") is done via a uvm_callbacks_objection and raise/drop.

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