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US 8,464,957 B2Granted
Integrated circuits with persistent data storage
AssigneeAlien Technology Corporation
InventorsCurtis L. Carrender, Roger G. Stewart, John H. Rolin, Ronald Gilbert
Life of this patent
Estimating the term…
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.
Claims19
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;
- and
- if the first code and second code match, transmitting by the tag a third code to the RFID reader.
1 more element
A method for a passive radio frequency identification (RFID) tag comprising:
- 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.
1 more element
A radio frequency identification (RFID) system comprising:
- 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.
A radio frequency identification (RFID) reader comprising:
- 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.
1 more element
Dependencies are inferred from the claim text.