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, 2005
Filed:
Sep. 26, 2002
James A. Williams, Mahtomedi, MN (US);
Robert H. Andrighetti, Somerset, WI (US);
Kelvin S. Vartti, Hugo, MN (US);
David P. Williams, Mounds View, MN (US);
James A. Williams, Mahtomedi, MN (US);
Robert H. Andrighetti, Somerset, WI (US);
Kelvin S. Vartti, Hugo, MN (US);
David P. Williams, Mounds View, MN (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
A mechanism to selectively leak data signals from a cache memory is provided. According to one aspect of the invention, an Instruction Processor (IP) is coupled to generate requests to access data signals within the cache. Some requests include a leaky designator, which is activated if the associated data signals are considered 'leaky'. These data signals are flushed from the cache memory after a predetermined delay has occurred. The delay is provided to allow the IP to complete any subsequent requests for the same data before the flush operation is performed, thereby preventing memory thrashing. Pre-fetch logic may also be provided to pre-fetch the data signals associated with the requests. In one embodiment, the rate at which data signals are flushed from cache memory is programmable, and is based on the rate at which requests are processing for pre-fetch purposes.