A method for maintaining the integrity of a dual microprocessor multiprocessing system and multiprocessing system.

摘要

A dual microprocessor computing system is used to control an engine in a motor vehicle. Each system contains a Personality Programmable Read Only Memory (PPROM) (44) containing system calibration data that is transferred from the PPROM to the read-write memories (84) in the microprocessors (26, 28). In order to identify each PPROM a byte of memory contains a check sum and a byte of the microprocessor memory contains an identical check sum. During data transfer, the check sums are compared. Also during data transfer, the amount of data being transferred within a predetermined interval is counted both at the transmitter and the receiver memories.