COHERENCY MAINTAINING DEVICE AND COHERENCY MAINTAINING METHOD

摘要

A second-level cache device (200) stores part of registration information of data for a first-level cache device (102) (and other first-level cache devices) in a second-level cache-tag unit (204a) in association with registration information in a second-level-cache data unit (204b), and stores the registration information of data for the first-level cache device (102) in a first-level cache-tag copying unit (204c). A coherency maintaining processor (203a) maintains coherency between the first-level cache device (102) and the second-level cache device (200) based on the information stored in the second-level cache-tag unit (204a) and the first-level cache-tag copying unit (204c).