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:
Oct. 11, 1994
Filed:
Sep. 24, 1990
Fujio Wakui, Hadano, JP;
Masahiko Tagami, Hadano, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Computer Eng. Co., Ltd., Hadano, JP;
Abstract
A data processing system capable of accessing multiple virtual address spaces wherein a an access register translation is performed when obtaining an origin address (STO) of a translation table to be used for address translation of a logical address into a real address. If an access register designated by an instruction has a value equal to a predetermined value, another STO stored in a control register is used instead of the STO obtained by the access register translation. Registers are provided for storing results of detection as to whether or not each of the access registers has a value equal to the predetermined value and a sector is provided selecting either the STO in the control register or the STO obtained by the access register translation based on the stored results of detection, thus eliminating a process to discriminate the values of the access registers at each access to the virtual address spaces.