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:
Jul. 26, 2005
Filed:
Sep. 21, 2001
Patrick J. Meaney, Poughkeepsie, NY (US);
Jonathan Chen, Yorktown Heights, NY (US);
Frank D. Ferraiolo, Essex Junction, VT (US);
Kevin C. Gower, LeGrangeville, NY (US);
Glenn E. Holmes, Wappingers Falls, NY (US);
Patrick J. Meaney, Poughkeepsie, NY (US);
Jonathan Chen, Yorktown Heights, NY (US);
Frank D. Ferraiolo, Essex Junction, VT (US);
Kevin C. Gower, LeGrangeville, NY (US);
Glenn E. Holmes, Wappingers Falls, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An SMP computer system has an apparatus and method for recalibrating a self-timed, source-synchronous, pipelined interface while the computer system is running. The apparatus allows for quiescing the interface (ie. idling the processors to allow for no data transfers), raising fences (blocking interfaces), allowing for a quick clock centering recalibration step, and then unfencing and unquiescing to allow for the use of the interface again. The recalibration allows for compensating for drift over time on the interface to compensate for temperature, voltage, cycle time, and end-of-life degradation without bringing down and restarting the system.