Method and circuit for analysis of the operation of a microcontroller using signature analysis during operation

摘要

A method and circuit for determining the health of a microcontroller is provided having a circuit that includes a bus having data streams thereon. A first CPU is coupled to the bus. A linear feedback shift register is coupled to the bus and generates a signature in response to the data streams. A memory is coupled to the bus. The memory is utilized by the first CPU. A controller is coupled to the register for controlling the reading of the data streams. The register generates a second signature in response to the data stream. The controller compares the reference signature and the second signature. The controller generates a fault signal when the reference signature is unequal to the second signature.