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:
Apr. 14, 2009
Filed:
Aug. 12, 2004
Paul R. Schumacher, Berthoud, CO (US);
Robert D. Turney, Watertown, WI (US);
Mark Paluszkiewicz, Schaumburg, IL (US);
Prasanna Sundararajan, Mountain View, CA (US);
Brandon J. Blodget, Santa Clara, CA (US);
Paul R. Schumacher, Berthoud, CO (US);
Robert D. Turney, Watertown, WI (US);
Mark Paluszkiewicz, Schaumburg, IL (US);
Prasanna Sundararajan, Mountain View, CA (US);
Brandon J. Blodget, Santa Clara, CA (US);
XILINX, Inc., San Jose, CA (US);
Abstract
Various approaches for embedding identifier information in a configuration bitstream for a programmable logic device (PLD) are disclosed. In various embodiments, the bits in the configuration bitstream that are unused in implementing a the design are identified. The identifier information is encrypted, and a subset of the unused bits are selected using a pseudo-random function. The encrypted identifier information is placed in the selected subset of unused bits. Decryption is accomplished by reversing the encryption approach.