Interlock for controlling processor ownership of pipelined data

Details Interlock for controlling processor ownership of pipelined data Interlock for controlling processor ownership of pipelined data

1991-04-03

1996-02-06

Rudolph, Rebecca L.

Boots, shoes, and leggings

395457, 395462, 395470, 395471, 395472, 395496, 36424345, 3642318, 3642468, 3642465, 36424341, 364DIG1, G06F 1208, G06F 1200

Patent

active

054902614

ABSTRACT:
Insures data integrity in process ownership indications by providing an ownership interlock on the data units in a pipeline to a store-in type of cache. An ownership interlock prevents any processor ownership change to occur (i.e. exclusive or readonly ownership) for a cache data unit until all outstanding stores have been made in the cache data unit, after which the ownership may be changed. An ownership change may be signalled by a cross-invalidate (XI) signal to a processor. Outstanding stores are received by the pipeline after the stores are completed by a processor, and the outstanding stores output from the pipeline into a store-in cache. A continuous flow of stores is enabled into and out of the pipeline to expedite a change of ownership requested of a data unit in the cache. The continuous flow avoids having to stop a processor from putting stores into the pipeline and avoids forcing all outstanding stores out of the pipeline into the cache before indicating a change of processor ownership.

REFERENCES:
patent: 4622631 (1986-11-01), Frank et al.
patent: 5265232 (1993-11-01), Gannon et al.
patent: 5276848 (1994-01-01), Gallagher et al.
patent: 5276852 (1994-01-01), Callander et al.
patent: 5317720 (1994-05-01), Stamm et al.

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