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:
May. 07, 2013
Filed:
Feb. 07, 2011
Jun Pin Tan, Kepong, MY;
Kiun Kiet Jong, Gelugor, MY;
Jun Pin Tan, Kepong, MY;
Kiun Kiet Jong, Gelugor, MY;
Altera Corporation, San Jose, CA (US);
Abstract
Methods and circuits for zeroization verification of the memory in an integrated circuit (IC) are provided. One method includes sequentially reading frames from a block of the memory, and sequentially performing a logical operation between each of the frames and the content of a signature register. The result of the logical operation is stored back in the signature register. In another operation, a hardware logical comparison is made between a device hardwired signature block and the content of the signature register, after the logical operations for all the frames have been performed. The device hardwired signature block is a hardware implemented constant that is unavailable for loading in registers of the IC. The block of the memory is verified to hold a fixed value when the result of the hardware logical comparison indicates that the device hardwired signature block is equal to the content of the signature register.