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. 07, 2001
Filed:
May. 12, 2000
Ben Y. Sheen, Milpitas, CA (US);
Michael G. Ahrens, Sunnyvale, CA (US);
Xilinx, Inc., San Jose, CA (US);
Abstract
A shift register system is disclosed wherein shift registers buffering memory data perform shift operations in response to a set of sub-clock signals. The set of sub-clock signals comprise nested sub-clock signals having non-overlapping transitions formed from a system clock signal or power on reset signal. Each shift register (or bank of shift registers) responds to a different sub-clock signal. As a result, shift operations are spread out over a period of time rather than occurring simultaneously. Thus, the current drawn during each shift operation is similarly spread out over a period of time. The maximum current drawn during any one shift operation is inversely proportional to the number of non-overlapping sub-clock signal. Therefore, the maximum current drawn (i.e., current spike) drawn during memory operations is minimized.