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:
Feb. 25, 2014
Filed:
Aug. 22, 2011
Hidehiro Fujiwara, Kanagawa, JP;
Koji Nii, Kanagawa, JP;
Makoto Yabuuchi, Kanagawa, JP;
Kazutami Arimoto, Kanagawa, JP;
Hidehiro Fujiwara, Kanagawa, JP;
Koji Nii, Kanagawa, JP;
Makoto Yabuuchi, Kanagawa, JP;
Kazutami Arimoto, Kanagawa, JP;
Renesas Electronics Corporation, Kawasaki-shi, JP;
Abstract
By using a fact that a bit error in an on-chip embedded memory occurs at a random address, means for creating a chip-unique ID and utilizing this ID are provided. A controller having received a verification request from outside instructs a variable power supply circuit to decrease a voltage supplied to a memory to be lower than that at the normal operation time. When the voltage supplied to the memory is stabilized, the controller requests a memory test to a memory BIST. By using an address where an error occurs due to a result of the memory test, the controller creates the chip-unique ID and uses the ID as a response to the verification request.