Method and device for selecting the operating mode of an integrated circuit
First Claim
Patent Images
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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Abstract
A device for selecting an operating mode of an integrated circuit, including a non-volatile memory programmable after manufacturing exhibiting prior to any programming an initial content, means for storing a first signature representative of the initial content of the memory, means for calculating a second signature representative of a current content of the 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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Citations
26 Claims
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1. A device for selecting an operating mode of an integrated circuit, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for selecting an operating mode of an integrated circuit comprising a non-volatile memory programmable after manufacturing, comprising the steps of:
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upon manufacturing of the integrated circuit, storing a first signature representative of an initial content, prior to any programming, of the memory in a storage means; and after manufacturing of the integrated circuit, controllably calculating a second signature representative of a current content of the non-volatile memory, evaluating a difference between the first and second signatures, and deactivating an operating mode selection signal when the difference is greater than a predetermined threshold.
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8. A device for selecting an operating mode of an integrated circuit, comprising:
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a non-volatile memory having an initial content after manufacturing; a storage device for storing a first signature representative of the initial content of the non-volatile memory; a calculation circuit configured to calculate a second signature representative of a current content of the non-volatile memory; and a control circuit configured to evaluate a difference between the first and second signatures and to deactivate an operating mode selection signal when the difference is greater than a predetermined threshold. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. An integrated circuit comprising:
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a non-volatile memory having an initial content after manufacturing; a mode select device for selecting an operating mode of an the integrated circuit, comprising; a storage device for storing a first signature representative of the initial content of the non-volatile memory; a calculation circuit configured to calculate a second signature representative of a current content of the non-volatile memory; and a control circuit configured to evaluate a difference between the first and second signatures and to deactivate an operating mode selection signal when the difference is greater than a predetermined threshold; and a functional block configured to operate in different operating modes according to a state of the operating mode selection signal. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A method for selecting an operating mode of an integrated circuit, comprising:
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providing on the integrated circuit a non-volatile memory having an initial content after manufacturing; storing a first signature representative of the initial content of the non-volatile memory; calculating a second signature representative of a current content of the non-volatile memory; and evaluating a difference between the first and second signatures and deactivating an operating mode selection signal when the difference is greater than a predetermined threshold. - View Dependent Claims (23, 24, 25, 26)
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Specification