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:
Dec. 02, 1997
Filed:
Nov. 07, 1995
Nobuyuki Oba, Sendai, JP;
Shigenori Shimizu, Kawasaki, JP;
International Business Machines Corp., Armonk, NY (US);
Abstract
The computer system comprises a processor 1, a cache memory 2 of this processor, a main memory 4, an I/O device 6 directly accessible to this main memory, an I/O controller 7, and the like. It is made so that the I/O controller can execute processing to retain data consistency between the cache memory and the main memory during access to the main memory by the I/O device. The I/O controller has an address buffer 9 that retains the cache line address of the previous access by the I/O device and it is made so that the consistency maintenance operation is not executed in cases other than the first access when accesses to the main memory by the I/O device are made continuously in the same data block.