05025365 is referenced by 99 patents and cites 11 patents.

This disclosure describes a snooping coherency protocol for a multiprocessor network wherein every processor has its own private cache and bus interface means and the network is connected via a common system bus. Each processor has its own cache directory and image directory that duplicate each other non-atomically. The snooping protocol utilizes the duality of directories coupled with the non-atomicity of directory updates to maximize processor-cache availability and minimize processor-cache access times thus supporting high performance architectures.

Title
Hardware implemented cache coherency protocol with duplicated distributed directories for high-performance multiprocessors
Application Number
7/270324
Publication Number
5025365
Application Date
November 14, 1988
Publication Date
June 18, 1991
Inventor
John S Fernando
Los Angeles
CA, US
Sanjay S Mathur
Mission Viejo
CA, US
Agent
Mark T Starr
Alfred W Kozak
Assignee
Unisys Corporation
PA, US
IPC
G06F 13/00
G06F 12/12
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