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:
Mar. 23, 2004
Filed:
Oct. 04, 2002
Junya Kawamata, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A nonvolatile semiconductor memory device includes a plurality of banks including respective memory cell arrays independent of each other, a password storage area that is associated with one of the banks, a bank decoder which generates a bank selection signal by decoding a bank address, a first bank selection circuit which outputs a write instruction or a read instruction to the one of the banks, a plurality of second bank selection circuits which outputs a write instruction or a read instruction to the respective banks except for the one of the banks, and a command-decode-&-bank-control circuit which controls the first and second bank selection circuits such that receipt of a first command causes one of the first and second bank selection circuits selected by the bank selection signal to output a write instruction or a read instruction, and such that receipt of a second command causes the first bank selection circuit to output a write instruction independently of the bank selection signal, and causes one of the second bank selection circuits selected by the bank selection signal to output a read instruction.