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:
Mar. 17, 1992
Filed:
Sep. 15, 1989
Applicant:
Inventors:
Hiroaki Ogawa, Nagoya, JP;
Masaaki Noguchi, Seto, JP;
Assignees:
Fujitsu Limited, Kawasaki, JP;
Fujitsu VLSI Limited, Kasugai, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365200 ; 365221 ; 36523009 ; 365236 ; 365239 ; 365241 ; 371 102 ;
Abstract
A semiconductor memory device includes a RAM and a serial access memory (SAM). The SAM includes an address counter which generates a slave address and a master address. The slave address precedes the master address by half the period of a serial access strobe signal. A redundancy decision is made by comparing the slave address with a redundancy address. When the master address is supplied to a data register provided in the SAM, the decision result is available. That is, the SAM can be accessed immediately after the master address is supplied thereto.