BFM - Bus functional Model

Bus functional models are simplified simulation models that accurately reflect the I/O level behavior of a device without modeling its internal computational abilities. For example, a bus functional model of a microprocessor would be able to generate PCI read and write transactions to a PCI device model to initialize and test the PCI device's functionality, but the microprocessor BFM would not be capable of reading CPU instructions from a memory and properly executing the instructions (this would require a complete behavioral level model of the processor). Bus functional models are commonly used in test benches to stimulate design models and verify their functionality