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:
May. 13, 2003
Filed:
Nov. 07, 2001
Hideharu Yahata, Inagi, JP;
Masashi Horiguchi, Koganei, JP;
Yoshinobu Nakagome, Hamura, JP;
Yoshikazu Saitoh, Hamura, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A semiconductor memory device realizing a reduced cycle time while improving the ease of use is to be provided. Where a memory cell requires a periodic refresh action to hold stored information, a time multiplexing mode of performing, when a first memory operation on any memory cell to read or write stored information or information to be stored and a second memory operation, having a different address designation from the first memory operation, or a refresh operation compete for the same time segment, the second memory operation before or after such first memory operation, wherein the minimum access time needed for the first memory operation and the second memory operation or the refresh operation performed before or after the first memory operation is set shorter than the sum of the length of time required for the first memory operation and that required for the second memory operation or the refresh operation on condition that sets of information stored in the memory cells are not mutually affected in the first memory operation and the second memory operation or the refresh operation.