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:
Dec. 14, 2004
Filed:
Jan. 25, 2001
John E. Larson, Houston, TX (US);
John M. MacLaren, Cypress, TX (US);
Robert A. Lester, Tomball, TX (US);
Gary J. Piccirillo, Cypress, TX (US);
Jerome J. Johnson, Spring, TX (US);
Patrick L. Ferguson, Cypress, TX (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A system and technique for correcting data errors in a memory device. More specifically, data errors in a memory device are corrected by scrubbing the corrupted memory device. Generally, a host controller delivers a READ command to a memory controller. The memory controller receives the request and retrieves the data from a memory sub-system. The data is delivered to the host controller. If an error is detected, a scrub command is induced through the memory controller to rewrite the corrected data through the memory sub-system. Once a scrub command is induced, an arbiter schedules the scrub in the queue. Because a significant amount of time can occur before initial read in the scrub write back to the memory, an additional controller may be used to compare all subsequent READ and WRITE commands to those scrubs scheduled in the queue. If a memory location is rewritten with new data prior to scheduled scrub corresponding to the same address location, the controller will cancel the scrub to that particular memory location.