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:
Jun. 22, 2004
Filed:
Mar. 27, 2002
Shusaku Yamaguchi, Kawasaki, JP;
Toshiya Uchida, Kawasaki, JP;
Yoshimasa Yagishita, Kawasaki, JP;
Yoshihide Bando, Kawasaki, JP;
Masahiro Yada, Kawasaki, JP;
Masaki Okuda, Kawasaki, JP;
Hiroyuki Kobayashi, Kawasaki, JP;
Kota Hara, Kawasaki, JP;
Shinya Fujioka, Kawasaki, JP;
Waichiro Fujieda, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A plurality of first memory blocks and a second memory block for reproducing data of the first memory blocks are formed. When a read command and a refresh command conflict with each other, a read control circuit accesses the first memory block according to the refresh command and reproduces read data by using the second memory block. When a write command and the refresh command conflict with each other, a write control circuit operates the memory block according to an order of command reception. Therefore, it is possible to perform refresh operation without being recognized by users. Namely, a user-friendly semiconductor memory can be provided.