Monitoring data consistency in data processing system - using state identifiers associated wth each cache memory and evaluation of responses to address operations

摘要

The method involves associating state identifiers with each cache memory entry and transferring a request, which consists of at least one address operation and which triggers a memory access, via a bus system (CBUS) to all units of the data processing system. - For each memory access of all processing units (CPUP..CPU3), at least one response derived from the state identifier of the addressed entry in the corresp. cache memory (CAMO..CAM3) is formed, the responses to the address operations are passed over the bus system and are evaluated for the presence of inconsistent data in the memories.