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:
Sep. 19, 2000
Filed:
Mar. 22, 1999
Tomonori Fujimoto, Osaka, JP;
Kiyoto Oota, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In addition to a pulse train of a refresh request (RRQ) signal requesting for refresh per memory row, a self-refresh mode (SRMOD) signal is applied to a refresh control circuit. As soon as the SRMOD signal makes a transition from LOW to HIGH, an oscillation circuit starts generating a clock pulse train. In response to this clock pulse train, a set pulse is generated. A flip-flop circuit is set by the set pulse and a leading edge of a periodic refresh request (PRRQ) signal pulse is generated. Every time the PRRQ signal becomes HIGH, a reset pulse is generated, the flip-flop circuit is reset by the reset pulse, and a trailing edge of the PRRQ signal pulse is generated. Such arrangement provides a memory having a novel refresh input specification capable of reducing a burden of logic circuits for controlling access of the memory.