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:
Jun. 15, 2004
Filed:
Feb. 13, 2003
Rudolph B. Klecka, III, Dallas, TX (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
An apparatus, method, communications device and computer readable medium for phase aligning two clocks and providing a graceful switch between active and standby circuitry is disclosed. A reporting circuit receives a measured phase difference between a first clock signal and a second clock signal, a selection circuit selects a configurable phase adjustment according to the measured phase difference, and a granularity adjustment circuit adds the configurable phase adjustment to the first clock signal generating a phase adjusted clock signal. The measured phase difference is compared to a maximum allowable phase difference value such that a phase adjustment is added to the first clock signal if the measured phase difference is greater than the maximum allowable phase difference value. The process is repeated until the measured phase difference is not greater than the maximum allowable phase difference value.