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. 25, 2007
Filed:
Apr. 29, 2004
Paul Stewart Yosim, Apex, NC (US);
Irfan Rashid, Cary, NC (US);
Paul Stewart Yosim, Apex, NC (US);
Irfan Rashid, Cary, NC (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Methods and apparatus that allow restricted access to internal registers of an integrated circuit (IC) device via an interface are provided. Unrestricted access to internal registers via the interface may be allowed during a manufacturing process to allow device testing. After such testing is complete, the device may be placed in a restricted access mode, for example, by blowing a master 'lock' fuse, to prevent unrestricted access to one or more of the internal registers via the interface. However, full or partial access to the internal registers may still be provided via an access code or 'combination lock' allowing the master fuse lock, in effect, to be bypassed.