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:
May. 22, 2007
Filed:
Apr. 28, 2000
Donald A. Williamson, Cupertino, CA (US);
John A. Wickeraad, Granite Bay, CA (US);
Donald A. Williamson, Cupertino, CA (US);
John A. Wickeraad, Granite Bay, CA (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A method and apparatus using a clock generator with sequential logic to align the phase of a first clock generated on a receiving integrated circuit (IC) chip to a second clock received by the receiving IC chip. One embodiment of the invention involves a method for aligning the phase of a first clock relative to the phase of a second clock, wherein the first clock is provided by a clock generator in a data processing system. The method includes sampling the second clock with a sampling clock, detecting an edge on the second clock, and stretching the first clock to align the phase of the first clock relative to the phase of the second clock. A second embodiment of the invention involves a data processing system including a transmitting chip, a receiving chip, and a clock generator for aligning the phase of a first clock relative to the phase of a second clock, wherein the second clock is received by the receiving chip. The clock generator includes a sampling circuit to sample the second clock with a sampling clock, a circuit to detect an edge on the second clock, and a sequential logic circuit to stretch the first clock to align the phase of the first clock relative to the phase of the second clock and control the clock generator.