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:
Jan. 03, 1995
Filed:
Aug. 07, 1992
Edmond H Barakat, Boca Raton, FL (US);
Robert B Haig, Delray Beach, FL (US);
International Business Machines Corp., Armonk, NY (US);
Abstract
A computer system is provided wherein dynamic random access memory within the system is refreshed by executing one of two refresh cycles. The computer system includes system dynamic random access memory and optional expansion dynamic random access memory which may be installed on an input/output bus. Circuitry is provided for detecting if at least one input/output device having dynamic random access memory incorporated therein is installed on the input/output bus. A refresh control unit incorporates control logic for alternatively executing (i) a first refresh cycle if no input/output device is connected to the input/output bus or (ii) a second refresh cycle if at least one of the input/output devices is connected to the input/output bus. The first refresh cycle is a faster than the second refresh cycle.