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. 20, 2002
Filed:
Sep. 26, 2000
Promod Kumar, Ghaziabad, IN;
STMicroelectronics S.r.l., Agrate Brianza, IT;
Abstract
A nonvolatile memory device has a signature code generator generating an new signature code as a function of data read from the cell array and the previously calculated signature code. Data are read in sequence, using an internal clock generated by an internal clock oscillator. In test mode, the memory is scanned sequentially, beginning from any memory location, selected randomly, and the signature code is variable in dynamic way; at the end of memory scanning, the signature code is compared to an expected result. Thus, testing may be performed at Wafer Sort Test Level, reading the memory cells at the memory operative speed, so as to ensure an early, fast and thorough detection of faults.