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:
Oct. 10, 2006
Filed:
Sep. 23, 2004
Kazuaki Kawaguchi, Kawasaki, JP;
Shigeo Ohshima, Yokohama, JP;
Kazuaki Kawaguchi, Kawasaki, JP;
Shigeo Ohshima, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
In an FCRAM having a late write function, when a first command signal indicates 'write active', whether a write operation or an auto-refresh operation is to be performed is determined on the basis of a second command signal. For example, when the second command signal indicates 'write', a write operation for a memory cell is performed by a late write scheme. When the second command signal indicates “auto-refresh”, an auto-refresh operation is performed. In the last write cycle of a write operation immediately preceding this auto-refresh operation, addresses for selecting a memory cell as an object of auto-refresh are predetermined. After data write to a memory cell is completed in the last write cycle, row precharge for auto-refresh is performed. After that, an auto-refresh operation (i.e., a data read operation and a data restore operation) is performed for the selected memory cell.