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:
Mar. 23, 2004
Filed:
Jan. 26, 2001
Douglas J. Burns, Westford, MA (US);
Barry S. Katz, Sudbury, MA (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A processor system, comprising a system board on which a processor, a memory logic controller, and a clock source are installed and a memory module on which a memory device and PLL clock driver are installed. The system board is configured to accept one or more memory modules. The clock signal generated by the clock source is distributed to the various devices on the system board by a clock buffer tree via equal length etch runs. The same clock signal is also propagated via a different length etch to the memory device on the memory module. Clock skew generated by these different clock etch lengths is removed by routing a carefully tuned feedback loop of the clock driver from the memory module to the system board and back to the clock driver on the memory module. The PLL performs a clock signal voltage translation from PECL to TTL voltage.