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. 02, 1996
Filed:
Feb. 22, 1993
Hitoshi Takagi, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An information processing system has a main memory unit, an expanded memory unit, and an instruction processing unit producing a virtual address. An address translation table, namely, a page table stores page table words which include main/expanded memory presence bits indicating to which memory unit of the main memory unit and the expanded memory unit real pages are stored. Preferably, the instruction processing unit may include an access type determiner for determining an access type for at least one operand. The access type indicates which memory unit is the optimum one for the operand. Instead of the access type determiner, the instruction processing unit may include segment descriptor registers for storing segment descriptors having expanded memory bits indicating which memory units are the optimum ones for the segments. In place of the access type determiner, the instruction processing unit may include virtual space registers for indicating virtual space numbers identifying a plurality of virtual spaces and an access type determining circuit for determining which memory unit is the optimum one for a designated virtual space.