The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 1996
Filed:
Jun. 30, 1994
Denis Foley, Shrewsbury, MA (US);
Maurice B Steinman, Hudson, MA (US);
Stephen R VanDoren, Shrewsbury, MA (US);
Digital Equipment Corporation, Maynard, MA (US);
Abstract
A method and apparatus in a computer system for updating Duplicate Tag cache status information. The invention operates in a computer system having one or more processor modules coupled to a system bus operating in accordance with a SNOOPING bus protocol. Processor commands and addresses for modification of an entry of the processor's Duplicate Tag status information is provided by the processor to its address interface to the system bus. System bus command and address information is received and stored in a interface pipeline of the address interface. A determination is made as to whether the system bus commands and addresses in the interface pipeline are valid. If there are no valid system bus commands and addresses in the interface pipeline, the Duplicate Tag status information is updated without determining if the processor commands and addresses conflict with the system bus commands and addresses.