Method and device for selecting the operating mode of an integrated circuit
AssigneeSTMicroelectronics S.r.l.
InventorYannick Teglia
Life of this patent
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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.
Claims26
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 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.
A method for selecting an operating mode of an integrated circuit comprising a non-volatile memory programmable after manufacturing, comprising the steps of:
- 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 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.
A device for selecting an operating mode of an integrated circuit, comprising:
- 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 with the difference is greater than a predetermined threshold.
An integrated circuit comprising:
- a non-volatile memory having an initial content after manufacturing;
- a mode select device for selecting an operating mode of an 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.
A method for selecting an operating mode of an integrated circuit, comprising:
- 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.
Dependencies are inferred from the claim text.