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:
Mar. 15, 2011
Filed:
Sep. 14, 2004
Jun Kamada, Kawasaki, JP;
Takayuki Hasebe, Kawasaki, JP;
Souichi Okada, Kanagawa, JP;
Takehiko Hayashi, Kanagawa, JP;
Jun Kamada, Kawasaki, JP;
Takayuki Hasebe, Kawasaki, JP;
Souichi Okada, Kanagawa, JP;
Takehiko Hayashi, Kanagawa, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A memory management unit manages a memory that stores a code, and sets that the memory that stores the code to be executed is valid to make a processor execute the code stores a verification key used to verify a validity of the code in a verification-key storing unit. When the code is stored in the memory and ready to be executed by the processor, the memory management unit verifies the validity of the code using the verification key stored in the verification-key storing unit and verification information assigned to the code. The memory management unit controls to set that the memory is valid when the validity is verified by the verifying unit, and not to set that the memory is valid when the validity is not verified by the verifying unit.