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:
Jun. 15, 1999
Filed:
Jul. 24, 1997
Applicant:
Inventors:
Steven William Wood, Kanata, CA;
Garnet Frederick Gibson, Nepean, CA;
Assignee:
Northern Telecom Limited, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365201 ; 36523005 ; 365190 ; 371 212 ;
Abstract
A multi-port RAM (random access memory) includes RAM cells which are coupled to respective row and column lines of each port. RAM cells selected by signals on the row and column lines of a port store binary data. A ground level voltage is applied onto selected column lines in a shadow write mode. Any short between the active column lines and the column lines in shadow write will result in a significant error voltage being applied to the active column line and invalid read will result. Shorts between column lines from different ports are sensitized.