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Method and device for selecting the operating mode of an integrated circuit

  • US 7,325,181 B2
  • Filed: 02/23/2004
  • Issued: 01/29/2008
  • Est. Priority Date: 02/24/2003
  • Status: Active Grant
First Claim
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1. A device for selecting an operating mode of an integrated circuit, comprising:

  • a non-volatile memory programmable after manufacturing, having, prior to any programming an initial content;

    means for storing a first signature representative of the initial content of the non-volatile memory;

    means for calculating a second signature representative of a current content of the non-volatile memory; and

    means for evaluating a difference between the first and second signatures and for deactivating an operating mode selection signal when the difference is greater than a predetermined threshold.

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