Method and apparatus for resisting hardware hacking through...

Details Method and apparatus for resisting hardware hacking through... Method and apparatus for resisting hardware hacking through...

2007-09-25

2007-09-25

Zimmerman, Brian (Department: 2612)

Communications: electrical

Selective

Intelligence comparison for controlling

C340S005200, C340S014310, C340S014610, C711S101000, C711S102000, C711S103000, C711S104000, C711S105000

Reexamination Certificate

active

10835462

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.

REFERENCES:
patent: 5297268 (1994-03-01), Lee et al.
patent: 6487646 (2002-11-01), Adams et al.
patent: 6998232 (2006-02-01), Feinstein et al.
patent: 2002/0013935 (2002-01-01), Boggs et al.
patent: 2004/0097266 (2004-05-01), Aerrabotu et al.
patent: 2005/0135170 (2005-06-01), Mozdzen

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