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. 20, 1990
Filed:
May. 20, 1988
Taketoshi Sakuraba, Yokohama, JP;
Hisashi Katada, Sagamihara, JP;
Yoshitaka Ohfusa, Yokohama, JP;
Yasufumi Yoshizawa, Tachikawa, JP;
Toshiaki Arai, Kawasaki, JP;
Hiroo Miyadera, Atsugi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a memory system having a storage device and a key storage keeping key data controlling an access to the storage device, there is disposed a key address translation structure for obtaining an address of an entry of the key storage based on an address of the storage device to which an access request is issued. As a result, when subdividing the storage device according to the key data setting unit, each subdivided area can be assigned with a variable size and a plurality of sizes are enabled to be specified for the key data setting units at the same time.