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. 08, 1991
Filed:
Oct. 30, 1987
Babu Rajaram, St. Joseph, MI (US);
Mark J Foster, Stevensville, MI (US);
Zenith Data Systems Corporation, Mt. Prospect, IL (US);
Abstract
An improved method for refreshing dynamic random access memory devices is disclosed. Normal refresh clocking signals are monitored and a count accumulated up to a selected value. Refresh operations are then initiated less frequently and only when the selected count has been accumulated. Once control of the bus to the memory has been achieved, a burst of refresh operations are performed prior to release of the bus. Improved efficiency and operating speed may be achieved by minimizing wasted time associated with acquisition and control of the bus. A preferred embodiment illustrates savings associated with a burst of four refresh operations each time the bus to the memory device is acquired for refreshing. Page addressing techniques are enhanced by forcing a change of state of the row address strobe line bus frequently than typical refresh operations.