System having multiple subsystems and test signal source resident upon common substrate

摘要

A system has multiple subsystems and a test signal source resident upon a common substrate. A first subsystem interfaces with an off-substrate functional tester during a test. The test signal source generates a first signal during the test for input to the second subsystem. The second subsystem responds performing an operation independent of operation and current state of the first subsystem. The functional tester verifies the independent operation of the first and second subsystems.