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:
Dec. 14, 1999
Filed:
Dec. 07, 1998
Jeon-Kyu Kim, Kyunggi-do, KR;
Chang-Hag Oh, Kyunggi-do, KR;
Choong-Sun Park, Seoul, KR;
Jeon-Hyoung Lee, Seoul, KR;
Abstract
Integrated circuit memory devices include an array of memory cells and a row address generator circuit which generates first and second different sequences of addresses during first and second refresh modes, respectively, and also repeats at least one of the addresses in the first sequence as an address in the second sequence when transitioning from the first refresh mode to the second refresh mode. The generator circuit may also perform the function of generating row addresses during the first and second refresh modes with the most significant bit of a row address being toggled with each consecutive row address during the first refresh mode. The first refresh mode may be a CAS-before-RAS refresh mode, the second refresh mode may be a self-refresh mode and the address in at least one of the first and second periods of the self-refresh mode may be equivalent to an address in the last period of a preceding CAS-before-RAS refresh mode when transitioning from the first refresh mode to the second refresh mode. This repetition in addressing prevents one or more row of memory cells from being skipped when transitioning from one refresh mode to another refresh mode.