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. 21, 1986
Filed:
Jul. 29, 1983
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06Z / ; G06Z / ;
U.S. Cl.
CPC ...
364200 ;
Abstract
In a storage hierarchy system, a part of data stored in a main storage in held as a copy by a buffer storage of a smaller capacity and higher speed than the main storage. A processor fetches data from the buffer storage or stores data in the buffer storage at a high speed. A buffer storage control system includes a first buffer directory and a second buffer directory. The first buffer directory and the buffer storage are accessed by an address for a fetch request, while the second buffer directory and the buffer storage are accessed by an address for store request, whereby competition for the access to the buffer storage between the fetch and store operations is reduced.