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. 10, 1987
Filed:
Mar. 30, 1983
Masaharu Satoh, Nara, JP;
Sadakatsu Hashimoto, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A new method of refreshing a dynamic RAM, uses relatively simple circuitry. Refreshing of the dynamic RAM can be implemented while smoothly accessing any a real-time based high-speed devices such as a floppy disc driver. In a microprocessor system comprising a central processing unit (CPU), a dynamic RAM, and a plurality of input/output ports, a refreshing process of the dynamic RAM can occur in one of two modes. When input/output (I/O) accesses are not being performed by the CPU, a burst mode refreshing process takes place. However, when input/output (I/O) accesses are to be performed, a refreshing process of the dynamic RAM can be implemented within a period while the CPU accesses the input/output (I/O) port addresses.