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:
Jan. 30, 1990
Filed:
Oct. 20, 1988
Hiroshi Takizawa, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A memory protection circuit is provided which prevents data stored in a programmable memory from being destroyed due to uncontrolled operations or malfunction of a writing unit. The memory protection circuit comprises a first decoder for detecting first predetermined data from write data, a second decoder for detecting second predetermined data out of address data which is associated with the write data, and a latch for latching a detection output of the first decoder when both a detection output of the second decoder and a write command signal exist, and for selectively allowing and inhibiting the write data from being written in a memory based on the information being latched.