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:
Nov. 14, 2000
Filed:
May. 09, 1997
Applicant:
Inventor:
Yoshio Masubuchi, Kawasaki, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
714 15 ;
Abstract
A before-image buffer controller is arranged separately from a memory controller and is connected to a system bus. When there is a write access request from a CPU to a cache memory corresponding to this CPU, the before-image buffer controller is automatically started in response to a command issued from this cache memory onto the system bus, and issues a command for reading previous data from a main memory. Since the before-image buffer controller operable independently of the memory controller is arranged in this way, a memory state restore function can be easily realized by using an existing computer system as it is without changing a memory controller.