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:
Sep. 07, 1999
Filed:
Jan. 19, 1998
Applicant:
Inventor:
Seiji Kachi, Tokyo, JP;
Assignee:
NEC Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365 63 ; 36518911 ;
Abstract
A memory mounting judgment circuit can improve reliability in detection whether ROM is mounted or not. In response to a power-ON reset signal, a signal from an output terminal of ROM is stored in a data storage portion. By pulling up a signal line electrically connecting the output terminal of ROM and the data storage portion, the signal line when ROM is not mounted, is fixed at all '1'. When ROM is mounted, data read out from ROM is stored in the data storage portion. Depending upon the storage content of the data storage portion, judgment whether ROM is mounted or not, is made.