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:
Feb. 20, 1990
Filed:
Feb. 29, 1988
Hideto Hidaka, Itami, JP;
Kazuyasu Fujishima, Itami, JP;
Masaki Kumanoya, Itami, JP;
Hideshi Miyatake, Itami, JP;
Katsumi Dosaka, Itami, JP;
Tsutomu Yoshihara, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor memory comprises a data bit memory cell array (3), a check bit memory cell array (4), and an address decoder (19) which includes a switching circuit (20) for selectively accessing data from either the memory cell array (3) or (4). Decoding signals d.sub.l to d.sub.m are used for reading out data latched by a column address strobe (CAS) signal. The decoding signals are applied to either the memory cell array (3) or (4) through a group of switching elements selectively rendered conductive by complementary signals .phi. and .phi.. The logical values of the signals .phi. and .phi. change responsive to a change in the CAS signal state.