Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Michael D. Fitzsimmons0
William C. Moyer0
Date of Patent
September 4, 2007
0Patent Application Number
101004620
Date Filed
March 18, 2002
0Patent Primary Examiner
Patent abstract
The invention relates to an integrated circuit (IC), and more particularly to security to protect an IC (10) against unauthorized accesses. In one embodiment, an identifier is provided external to IC 10. A corresponding input IC security key (52) is then provided to IC 10 and compared to a stored IC security key (30). If the input IC security key (52) and the stored IC security key (30) do not match, access to protected functional circuitry (12) is prohibited. The present invention may use any debug interface, including standard debug interfaces using the JTAG 1149.1 interface defined by the IEEE.
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