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. 12, 1991
Filed:
Nov. 09, 1988
Hisashi Katada, Sagamihara, JP;
Yasuhiro Inagami, Kodaira, JP;
Yoshiko Tamaki, Kunitachi, JP;
Shigeo Nagashima, Hachioji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
In a method and apparatus wherein a logical address of a main storage designated by a program is translated into a real address: an address translation table for each of a plurality of address translation sizes is prepared; the logical address designated by the program is fetched; an entry of an address translation table whose address translation size is larger than those of the other address translation tables among the plurality of address translation sizes is first identified based on the fetched logical address; a first information on an address translation size validity included in the first indentified entry is checked; address translation in units of translation size of the address translation table including the first identified entry is performed when the first information indicates valid; when the first information indicates invalid, an entry of an address translation table whose address translation size is next smaller than that of the address translation table including the first identified entry is second identified, based on the top address of the address translation table including the second identified entry and based on the fetched logical address; and address translation is further performed returning back to the above-mentioned step where the first information on the address translation size included in the first identified entry is checked.