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. 02, 2002
Filed:
Nov. 28, 2000
Raymond C. Pang, San Jose, CA (US);
Jennifer Wong, Fremont, CA (US);
Scott O. Frake, Cupertino, CA (US);
Jane W. Sowards, Fremont, CA (US);
Venu M. Kondapalli, Sunnyvale, CA (US);
F. Erich Goetting, Cupertino, CA (US);
Stephen M. Trimberger, San Jose, CA (US);
Kameswara K. Rao, San Jose, CA (US);
Xilinx, Inc., San Jose, CA (US);
Abstract
It is sometimes desirable to encrypt a design for loading into a PLD so that an attacker may not learn and copy the design as it is being copied into the PLD. According to the invention, the encrypted design is decrypted by a key or keys within the PLD that are preserved when power is removed by either being stored in nonvolatile memory or by being backed up with a battery that switches into operation when the power is removed from the PLD.