Integrated circuits with persistent data storage
First Claim
Patent Images
1. A method for a radio frequency identification (RFID) tag comprising:
- receiving a first code transmitted by an RFID reader, the first code generated by an XOR calculation;
comparing a second code within the tag to the first code;
andif the first code and second code match, transmitting by the tag a third code to the RFID reader.
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Abstract
A tag receives a first code transmitted by an RFID reader. The first code is compared with a second code stored within the tag. If the first code and the second code match, the tag transmits a third code to the RFID reader.
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Citations
19 Claims
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1. A method for a radio frequency identification (RFID) tag comprising:
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receiving a first code transmitted by an RFID reader, the first code generated by an XOR calculation; comparing a second code within the tag to the first code; and if the first code and second code match, transmitting by the tag a third code to the RFID reader. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for a passive radio frequency identification (RFID) tag comprising:
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receiving an access code transmitted by a reader, the access code generated by an XOR calculation; comparing a second code within the passive RFID tag to the access code; and if the access code and second codes match, transmitting by the passive RFID tag a CRC code to the reader. - View Dependent Claims (12, 13)
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14. A radio frequency identification (RFID) system comprising:
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a receiver configured to receive a first code transmitted by an RFID reader, the first code generated by an XOR calculation; a backscatter transmitter; processing logic coupled to the backscatter transmitter and to the receiver and configured to compare a second code within the system to the first code and configured to cause the backscatter transmitter to transmit a third code to the RFID reader if the first code and the second code match. - View Dependent Claims (15, 16, 17, 18)
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19. A radio frequency identification (RFID) reader comprising:
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at least one antenna; a receiver coupled to the at least one antenna; a transmitter coupled to the at least one antenna; processing logic coupled to the transmitter and configured to cause the transmitter to transmit an access code that is generated by an XOR calculation and configured to receive a response which includes a CRC code from a tag in response to the access code wherein the processing logic is configured for a half-duplex communication under a reader talks first protocol.
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Specification