Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2007-06-30
2010-02-02
Elmore, Stephen C (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S156000, C365S185040, C365S185330, C365S189030, C365S195000, C713S001000, C713S100000
Reexamination Certificate
active
07657722
ABSTRACT:
A method and apparatus for automatically securing non-volatile (NV) storage in an integrated circuit provides improved resistance to code copying and reverse-engineering attacks. External interfaces that provide read access to the NV storage are be disabled, for a predetermined time after a reset or other initialization signal is received. An internal lock state bit or key is checked as well as an external lock prevent indication. If the lock prevent indication is not received, or the internal lock state bit is already set, then the integrated circuit is operated under a locked condition, in which external access to the NV storage values is prevented. The lock prevent indication may be a signal provided during reset of the integrated circuit on a terminal that is used for another purpose after initialization of the integrated circuit.
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Abullarade Jorge Antonio
Angel Edwin De
Pina Jean Charles
Singh Rahul
Cirrus Logic Inc.
Elmore Stephen C
Harris Andrew M.
Mitch Harris Atty at Law, LLC
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