Electronic digital logic circuitry – Security
Reexamination Certificate
2006-03-07
2006-03-07
Tan, Vibol (Department: 2819)
Electronic digital logic circuitry
Security
C326S016000, C326S039000, C380S059000, C380S001000, C365S228000, C365S218000
Reexamination Certificate
active
07009419
ABSTRACT:
A method and circuit for preventing external access to secure data of an integrated circuit while supporting DFT is disclosed. In accordance with the method the integrated circuit is automatically placed into the test mode at integrated circuit power-up from a power-down state. At power up, secure data is other than present within a secure data-path of the integrated circuit. Access is provided to the secure data path via a second data path coupled with the first secure data-path. Via the access path, data other than secure data is provided to the integrated circuit, the data for performing test functions of the integrated circuit operating in the test mode. Once data other than secure data is provided to first secure data path, the test mode is terminated and access via other than the secure ports is disabled. The test mode is only re-entered by powering down the integrated circuit and re-initialising it.
REFERENCES:
patent: 5493532 (1996-02-01), McClure
patent: 5638306 (1997-06-01), Intrater et al.
patent: 5828824 (1998-10-01), Swoboda
patent: 6065106 (2000-05-01), Deao et al.
patent: 6072328 (2000-06-01), Takuma
patent: 6081885 (2000-06-01), Deao et al.
patent: 6118296 (2000-09-01), Ozaki
patent: 6184048 (2001-02-01), Ramon
patent: 6199182 (2001-03-01), Whetsel
patent: 6269038 (2001-07-01), Itou et al.
patent: 6331784 (2001-12-01), Mason et al.
patent: 6466048 (2002-10-01), Goodman
patent: 6472902 (2002-10-01), Seki et al.
patent: 6522589 (2003-02-01), Miyakawa et al.
patent: 6651196 (2003-11-01), Iwase et al.
Hamilton Brook Smith & Reynolds P.C.
Mosaid Technologies Inc.
Tan Vibol
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