Hot standby memory copy system

Patent 5123099 Issued on June 16, 1992. Estimated Expiration Date:

June 16, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

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Inventors

Assignee

Fujitsu Ltd.

Application

No. 219565 filed on 07/15/1988

US Classes:

711/120, Parallel caches711/142, Write-through711/143Write-back

Examiners

Primary: Popek, Joseph A.
Assistant: Rudolph, Rebecca L.

Attorney, Agent or Firm

Staas & Halsey

Foreign Patent References

0083400 EP. 07/13/1983
2006488A GB. 05/13/1979

International Class

G06F 012/00

Foreign Application Priority Data

1987-07-15 JP

Abstract

Disclosed is an electronic exchange with a hot standby memory copy system including main storage devices that are duplexed wherein to improve the processing capacity of a central processing unit and make the best use of the speed of a cache memory, in an information processing apparatus provided with central processing units, main storage devices and cache memories all of which are duplexed, first-in first-out memories that are duplexed and connected to the central processing units, a unit for simultaneously writing data, when the central processing unit writes the data into the cache memory, into the first-in first-out memory, and a unit for writing, independently of an operation of the central processing unit, the contents of a currently used one of the first-in first-out memories into a standby one of the main storage devices are provided.