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:
Aug. 06, 1996
Filed:
May. 31, 1995
Akinori Matsuo, Higashiyamato, JP;
Masashi Watanabe, Kokubunji, JP;
Masashi Wada, Akishima, JP;
Takeshi Wada, Akishima, JP;
Yasuhiro Nakamura, Kodaira, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi ULSI Engineering Corp., Tokyo, JP;
Abstract
A semiconductor memory device having a plurality of nonvolatile memory devices or elements disposed in a matrix arrangement as one or more memory arrays is provided with a write operation and a verify mode which is automatically implemented when the write operation of the memory device ends. In connection with this, an auto-verify function is set in an internal circuit associated with the memory in accordance with a predetermined control signal and wherein a read mode subsequent to the write operation is implemented. During the auto-verify function, the read mode is implemented by effecting a data comparison circuit, such as an exclusive-OR logic circuit, which performs a coincidence/non-coincidence operation comparing the write data and the read data.