| 摘要 |
PROBLEM TO BE SOLVED: To provide an improved processing unit and a data processing system and method for coherency management in a multiprocessor data processing system. SOLUTION: A multiprocessor data processing system includes at least first and second coherency domains, where the first coherency domain includes a system memory and a cache memory. The method of data processing includes a step for buffering a cache line in a data array of the cache memory and a step for setting a state field in a cache directory of the cache memory to a coherency state to indicate that the cache line is valid in the data array, that the cache line is held in the cache memory non-exclusively, and that another cache in the second coherency domain may hold a copy of the cache line. COPYRIGHT: (C)2008,JPO&INPIT
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