Memory for RFID tags that is suitable for receiving a deactivation command
First Claim
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1. An integrated circuit memory, for use in a contactless tag of RFID type, comprising:
- a group of memory words that are suitable for storing an identifier of the tag and are write-accessible via a standard write command;
at least one additional memory word suitable for storing a deactivation value; and
a control circuit responsive to presence of the stored deactivation value for preventing the reading and/or the transmission of the identifier in response to receipt of a radio interrogation signal.
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Abstract
A memory for a contactless tag of the RFID type is configured to receive a deactivation command. The memory includes a group of memory words that are suitable for storing an identifier of the tag and are write-accessible via a standard write command. The memory further includes at least one additional memory word suitable for storing a deactivation value. The detected presence of the deactivation value makes it possible for the tag to prevent reading and/or the transmission of the identifier in response to a radio interrogation signal.
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Citations
34 Claims
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1. An integrated circuit memory, for use in a contactless tag of RFID type, comprising:
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a group of memory words that are suitable for storing an identifier of the tag and are write-accessible via a standard write command;
at least one additional memory word suitable for storing a deactivation value; and
a control circuit responsive to presence of the stored deactivation value for preventing the reading and/or the transmission of the identifier in response to receipt of a radio interrogation signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for definitively deactivating a contactless tag of RFID type, wherein the tag includes an integrated circuit memory having a group of memory words that are suitable for storing an identifier of the tag and are write-accessible via a standard write command, the method comprising:
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writing a deactivation value to an additional memory word different from said group of memory words;
detecting presence of the deactivation value in said additional memory word; and
preventing the reading and/or the transmission of said identifier in response to a radio interrogation signal if deactivation value presence is detected. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An integrated circuit memory, comprising:
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at least one first memory location for storing a data word;
a second memory location for storing a deactivation word; and
a circuit responsive to a request to access the at least one first memory location to retrieve the data word for determining whether the second memory location contains the deactivation word and, if so, then preventing retrieval of the data word from the first memory location. - View Dependent Claims (14, 15, 16, 17)
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18. A method for integrated circuit memory operation, the memory including at least one first memory location for storing a data word and a second memory location for storing a deactivation word, the method comprising:
responding to a request to access the at least one first memory location to retrieve the data word by determining whether the second memory location contains the deactivation word and, if so, then preventing retrieval of the data word from the first memory location. - View Dependent Claims (19, 20, 21, 22)
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23. An RFID tag, comprising:
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at least one first memory location for storing a data word which identifies the RFID tag;
a second memory location for storing a deactivation word; and
a circuit responsive to a received tag interrogation signal requesting RFID tag identification for determining whether the second memory location contains the deactivation word and, if so, then preventing retrieval of the data word identifying the RFID tag from the first memory location. - View Dependent Claims (24, 25, 26, 27, 28)
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29. A method of RFID tag operation, wherein the tag includes at least one first memory location for storing a data word which identifies the RFID tag and a second memory location for storing a deactivation word, the method comprising:
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receiving a tag interrogation signal that requests RFID tag identification;
determining whether the second memory location contains the deactivation word; and
if so, then preventing retrieval of the data word identifying the RFID tag from the first memory location. - View Dependent Claims (30, 31, 32, 33, 34)
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Specification