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. 27, 2011
Filed:
Aug. 15, 2008
Jethro C. Law, Austin, TX (US);
Kirk Edward Morrow, Round Rock, TX (US);
John Cummings Schiff, Austin, TX (US);
Glen Arthur Wiedemeier, Austin, TX (US);
Jethro C. Law, Austin, TX (US);
Kirk Edward Morrow, Round Rock, TX (US);
John Cummings Schiff, Austin, TX (US);
Glen Arthur Wiedemeier, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A system and method for switching digital circuit clock net driver without losing clock pulses is presented. A device uses glitchless clock selection logic, which includes an edge detector, to select a clock signal to provide to device circuitry based upon the device circuitry's performance requirements. When the rising edges of a first clock signal and a second clock signal align, the edge detector momentarily pulses a clock switch signal, which is used to clock in a clock selection signal to a multiplexer. As a result, when the clock selection signal is high, the device waits until the clock edges are aligned before switching clock signals.