METHOD FOR THE SELECTION OF A COMMON MEMORY OF A MULTI-PROCESSOR SYSTEM COMPOSED OF INDIVIDUAL MICROPROCESSOR SYSTEMS WITH COLLISION AVOIDANCE

摘要

ABSTRACT OF THE DISCLOSUREIn a multi-processor system in which a plurality ofmicroprocessor systems are allocated to a common multi-processorbus in cyclical fashion in a sequence prescribed by prioritycharacterizing numbers assigned to said systems, the priorityallocation of bus access is overlaid by a further method thatcoordinates the access of a microprocessor system to a regionstoring a common data base in a common memory. One of themicroprocessor systems functions as the main processor system andis authorized to up-date the data base and all othermicroprocessor systems function as subsidiary processors whichcan read the data base information. Before its access, everymicroprocessor system accessing the data base communicates astatus signal to the other micro-processor systems, thispreventing the main processor system from up-dating the data basewhile one of the subsidiary processor systems is already readingthe data base information.