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. 02, 2010
Filed:
Dec. 20, 2000
Yusuke Kawasaki, Kawasaki, JP;
Hiroshi Sakurai, Kawasaki, JP;
Shigeru Hashimoto, Kawasaki, JP;
Koken Yamamoto, Kawasaki, JP;
Yusuke Kawasaki, Kawasaki, JP;
Hiroshi Sakurai, Kawasaki, JP;
Shigeru Hashimoto, Kawasaki, JP;
Koken Yamamoto, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A processing apparatus including an internal circuit having a CPU and internal devices and an external circuit including external devices provided externally of the internal circuit, and the like, and is aimed to prevent illicit access and reverse engineering. The internal circuit including a CPU, internal devices and a bus line connecting the CPU to the internal devices and extending externally, and the external circuit including external devices provided externally of an externally extending portion of the bus line. The internal circuit further including a ciphering sectionprovided at an entrance to an external side and ciphering addresses and data on the bus line by ciphering patterns according to a plurality of regions divided from an address space allotted to the entire external devices.