Method for data bus snooping in a data processing system by sele

Details Method for data bus snooping in a data processing system by sele Method for data bus snooping in a data processing system by sele

1989-05-15

1992-06-02

Hecker, Stuart N.

Boots, shoes, and leggings

364DIG1, G06F 1208

Patent

active

051194856

ABSTRACT:
A bus snoop control method for maintaining coherency between a write-back cache and main memory during memory accesses by an alternate bus master. The method and apparatus incorporates an option to source `dirty` or altered data from the write-back cache to the alternate bus master during a memory read operation, and simultaneously invalidate `dirty` or altered data from the write-back cache. The method minimizes the number of cache accesses required to maintain coherency between the cache and main memory during page-out/page-in sequences initiated by the alternate bus master, thereby improving system performance.

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