Instruction cache flush-on-rei control
CA 1315004 C · Owner: Steely, Simon Carl Jr. · Inventors: Steely, Simon Carl Jr.; Ramanujan, Raj Kannan; Bannon, Peter Joseph
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus for optimizing the performance of a multiple cache system computer having separate caches for data and instructions in which all writes to the data cache are monitored. If the address tag of the item being written matches one of a list of tags representing valid instructions currently stored in the instruction cache, a flag called I_FLUSH_ON_REI is set. Until this flag is set REI (Return from Exception or, Interrupt) instructions will not flush the instruction cache. When the flag is set, an REI command will also flush or clear the instruction cache. Thus the, instruction cache is only flushed when an address referenced by an instruction is modified so as to, reduce …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 23, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 23, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.