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:
Aug. 23, 1994
Filed:
Dec. 20, 1991
Applicant:
Inventors:
Michael T Derwin, Delray Beach, FL (US);
William A Wall, Boca Raton, FL (US);
Assignee:
International Business Machines Corp., Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
395425 ; 395375 ; 364D / ; 36424341 ; 3642716 ; 3642718 ; 364263 ; 3642384 ; 36494834 ; 36496434 ;
Abstract
A personal computer has a memory system including a write-through cache which is accessible by more than one device. A snoop mechanism includes logic that monitors bus master control signals to determine if a new memory write cycle has been started before a current snoop cycle has finished. If a new cycle has been started, then a corresponding snoop cycle occurs which overlaps the new memory cycle and is pipelined with the previous snoop cycle so that the snooping mechanism does not fall behind the memory write cycles.