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. 10, 2003
Filed:
Nov. 28, 2000
Masaru Shimomura, Kyoto, JP;
Nintendo Co., Ltd., Kyoto, JP;
Abstract
The invention prevents execution of unauthorized copies of programs. In one example embodiment, a semiconductor storage device includes a program ROM. A calculator of an address processing unit included in the program ROM processes lower bits (e.g., A -A ) of a first address from an address bus of a CPU using an address calculation code e.g., (a -a ) from a code storing unit. The calculator outputs a modified lower address (e.g., A ′-A ′). A selector may selectively replace the original lower address (e.g., A -A ) with the modified lower address (e.g., A ′-A ′) As a result of the replacement, a second address is output from the address processing unit different from the first address.