Method for the identification of an integrated circuit and associated device
First Claim
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1. A method for identification of an integrated circuit of a type comprising an indelibly stored identification number, the method comprising the steps of:
- writing, in a volatile register, a required number corresponding to an identification number of a required circuit;
decoding, in the integrated circuit, the required number and supplying an information element representing the compatibility of the integrated circuit with the required circuit; and
furnishing, during a reading of the identification number, the indelibly stored identification number of the integrated circuit which remains unchanged during the life thereof if the integrated circuit is not compatible with the required circuit or the required number if the integrated circuit is compatible with the required circuit.
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Abstract
A method is for the identification of an integrated circuit, and includes steps for writing, in a volatile register, a required number; the decoding, in the integrated circuit, of the required number and the reading of the identification number if the integrated circuit is not compatible with the required circuit or the reading of the required number if the integrated circuit is compatible with the required circuit. An identification device may include a non-volatile register, a volatile register, a decoder and a router.
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Citations
23 Claims
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1. A method for identification of an integrated circuit of a type comprising an indelibly stored identification number, the method comprising the steps of:
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writing, in a volatile register, a required number corresponding to an identification number of a required circuit; decoding, in the integrated circuit, the required number and supplying an information element representing the compatibility of the integrated circuit with the required circuit; and furnishing, during a reading of the identification number, the indelibly stored identification number of the integrated circuit which remains unchanged during the life thereof if the integrated circuit is not compatible with the required circuit or the required number if the integrated circuit is compatible with the required circuit. - View Dependent Claims (2, 3, 4)
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5. A method for identification of an integrated circuit of a type comprising an identification number, the method comprising the steps of:
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writing, in a first register, a required number corresponding to an identification number of a required circuit; decoding, in the integrated circuit, the required number and supplying an information element representing the compatibility of the integrated circuit with the required circuit; and furnishing, during a reading of the identification number, the identification number of the integrated circuit which is indelibly stored and which remains unchanged during the life the integrated circuit if the integrated circuit is not compatible with the required circuit or the required number if the integrated circuit is compatible with the required circuit. - View Dependent Claims (6, 7, 8)
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9. A method for identification of an integrated circuit of a type comprising an identification number, the method comprising the steps of:
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writing, in a first register, a required number corresponding to an identification number of a required circuit; decoding, in the integrated circuit, the required number by comparing the required number with the identification number and supplying an information element representing the compatibility of the integrated circuit with the required circuit; and furnishing, during a reading of the identification number, the identification number of the integrated circuit which is indelibly stored and which remains unchanged during the life the integrated circuit if the integrated circuit is not compatible with the required circuit or the required number if the integrated circuit is compatible with the required circuit. - View Dependent Claims (10)
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11. A method for identification of an integrated circuit of a type comprising an identification number, the method comprising the steps of:
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writing, in a first register, a required number corresponding to an identification number of a required circuit; decoding, in the integrated circuit, the required number by reading in a non-volatile memory information placed at an address corresponding to the required number representing compatibility between the required circuit and the integrated circuit, and supplying an information element representing the compatibility of the integrated circuit with the required circuit; and furnishing, during a reading of the identification number, the identification number of the integrated circuit which is indelibly stored and which remains unchanged during the life the integrated circuit if the integrated circuit is not compatible with the required circuit or the required number if the integrated circuit is compatible with the required circuit. - View Dependent Claims (12)
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13. An integrated circuit having an identification feature and comprising:
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a non-volatile register for indelibly storing an identification number of said integrated circuit that remains unchanged during the life thereof; a volatile register to store a required number corresponding to an identification number of a required circuit; a decoder for providing an information element representing compatibility between the integrated circuit and the required circuit; and a multiplexer for routing, during a read operation, either the required number or the identification number of the integrated circuit as a function of the information element. - View Dependent Claims (14, 15, 16, 17)
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18. An identification device for an integrated circuit comprising:
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a first register for indelibly storing an identification number of the integrated circuit that remains unchanged during the life thereof; a second register to store a required number corresponding to an identification number of a required circuit; a decoder for providing an information element representing compatibility between the integrated circuit and the required circuit; and a router for routing, during a read operation, either the required number or the identification number of the integrated circuit as a function of the information element. - View Dependent Claims (19, 20, 21, 22, 23)
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Specification