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. 11, 1998
Filed:
Jan. 22, 1997
Thomas Basilio Genduso, Apex, NC (US);
Joseph Michael Mosley, Boca Raton, FL (US);
International Business Machines Corp., Armonk, NY (US);
Abstract
A processor clock (302) is momentarily synchronized to a subsystem clock (307) during transfers of data between a processor (301) and a subsystem (305). After the completion of the data transfer, synchronization is disabled and the processor clock runs asynchronously at its own internal frequency, which is higher than the subsystem clock frequency. In one embodiment, the processor clock uses a free running ring oscillator (401) that is constructed on the same integrated circuit chip as the processor. Changes in temperature and power supply voltage not only cause changes in the maximum operating speed of the processor, but they also cause corresponding changes in the frequency of the processor clock. Thus, the frequency of the processor clock tracks changes in the maximum operating speed of the processor caused by temperature and power supply variations.