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:
Oct. 06, 2009
Filed:
May. 31, 2006
Brian Derek Alleyne, Los Gatos, CA (US);
John Christian Holst, San Jose, CA (US);
Hai Ngoc Nguyen, Palo Alto, CA (US);
Brian Derek Alleyne, Los Gatos, CA (US);
John Christian Holst, San Jose, CA (US);
Hai Ngoc Nguyen, Palo Alto, CA (US);
Cisco Technology, Inc., San Jose, CA (US);
Abstract
A circuit to reduce noise spikes on the power and ground rails of a chip when switching over an input-output bus, the circuit comprising an encoder to encode a word before transmission over the input-output bus so that the difference in the number of 1 bits and the number of 0 bits in the encoded word is upper bounded, where the upper bound is less than the length of the original word before encoding. An embodiment circuit to implement this encoding comprises partitioning the word into a plurality of smaller words. An embodiment circuit further comprises a number of stages, where in the first stage, there are a plurality of encoders to encode in pair-wise fashion the smaller words. Additional stages also comprise a plurality of encoders, each encoder performing a pair-wise encoding of words outputted by a previous stage. Other embodiments are described and claimed.