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:
Jan. 06, 1998
Filed:
Sep. 11, 1995
Souichi Kobayashi, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A novel data processing system is disclosed. Least significant bits of an address of a to-be-accessed memory of a number corresponding to a minimum specified range of a plurality of to-be-controlled memory areas each specified in an arbitrary size in advance are masked by mask bits. The access address with a predetermined number of least significant bits thereof masked is compared with each head address of a plurality of the memory areas to be controlled. It is decided in which of the memory areas to be controlled the access address is included. The memory access is controlled by access control data set for each memory area to be controlled. Further, the plurality of memory areas to be controlled are arranged in the order of priority. The to-be-controlled memory areas of higher priority are removed from the whole of the memory areas, whereby discontinuous memory areas are treated as a single memory area to be controlled.