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. 30, 2005
Filed:
Feb. 12, 2004
Chiao Kai Hwang, Fremont, CA (US);
Gregory Starr, San Jose, CA (US);
Martin Langhammer, Salisbury, GB;
Chiao Kai Hwang, Fremont, CA (US);
Gregory Starr, San Jose, CA (US);
Martin Langhammer, Salisbury, GB;
Altera Corporation, San Jose, CA (US);
Abstract
In a specialized functional region of a programmable logic device, in which certain components may not be used, those components can be placed in a low-power mode so that they do not switch. For example, in an adder which is not being used but is receiving inputs, the current path for the adding circuitry is interrupted, while the output is forced low. If the adder is a carry/look-ahead adder, the GENERATE and PROPAGATE signals normally used in subsequent stages to predict the value of the carry signal are forced to constant values even if the inputs to the adder are changing.