Method for supporting cache-coherence in a multiprocessor system, involves displaying coherence answer when first transaction is received from provider in order to indicate status information for the data read from the first transaction

摘要

Data processing system require increased data throughput and high operating speed with adequate bandwidth when using bus-based cache-coherence protocol systems in order to utilized a wide-ranging, distributed multi-bus and multi-processor system, using at least 2-4 processors. When a first transaction is received from a first provider, a coherence-answer is prepared for displaying the status information for the data read from the first transaction. A second transaction is then received from a second provider, the two providers working together, using a first or a second cache mode. The second transaction is then processed on the basis of a transaction type code of the second transaction and a collision condition between the first and the second transactions.