Interface arbitration for a wired tag
First Claim
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1. An integrated circuit (IC) comprising:
- a memory;
a radio frequency (RF) interface configured to access the memory;
a wired interface connected to a host and configured to access the memory; and
an arbitration module comprising first and second registers that is configured to determine which of the RF interface or the wired interface may access the memory based upon an idle state, a wired lock state, and a RF locked state, wherein either the RF interface or the wired interface may access the IC in the idle state, the first register is configured to indicate a status of the RF interface, and the second register is configured to indicate a status of the wired interface.
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Abstract
Various exemplary embodiments relate to an integrated circuit (IC) including: a memory; a radio frequency (RF) interface configured to access the memory; a wired interface connected to a host and configured to access the memory; and an arbitration module configured to prevent concurrent access to the memory by more than one interface. Various exemplary embodiments relate to a method of controlling access in a dual interface tag having a wired interface and a radio frequency (RF) interface operable in an idle state, a wired lock state, and a RF locked state.
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Citations
19 Claims
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1. An integrated circuit (IC) comprising:
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a memory; a radio frequency (RF) interface configured to access the memory; a wired interface connected to a host and configured to access the memory; and an arbitration module comprising first and second registers that is configured to determine which of the RF interface or the wired interface may access the memory based upon an idle state, a wired lock state, and a RF locked state, wherein either the RF interface or the wired interface may access the IC in the idle state, the first register is configured to indicate a status of the RF interface, and the second register is configured to indicate a status of the wired interface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling access in a dual interface tag having a wired interface and a radio frequency (RF) interface that are configured to operate in an idle state, a wired lock state, and a RF locked state, the method comprising:
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transitioning from the idle state to the wired lock state based on a first communication received via the wired interface by receiving an address via the wired interface, determining that the address is a slave address of the tag on the wired interface, and setting a register associated with the wired interface to indicate that the wired interface is busy; transitioning from the wired lock state to the idle state based on a second communication received via the wired interface or a lack of power on the wired interface; transitioning from the idle state to the RF locked state based on a status of the RF interface; transitioning from the RF locked state to the idle state based on the status of the RF interface; and determining which of the RF interface or the wired interface may access the dual interface tag, wherein either the RF interface or the wired interface may access the dual interface tag in the idle state and each interface has a separately indicated status. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. A method of controlling access in a dual interface tag having a wired interface and a radio frequency (RF) interface that are configured to operate in an idle state, a wired lock state, and a RF locked state, the method comprising:
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transitioning from the idle state to the wired lock state based on a first communication received via the wired interface; transitioning from the wired lock state to the idle state based on a second communication received via the wired interface or a lack of power on the wired interface; transitioning from the idle state to the RF locked state based on a status of the RF interface; transitioning from the RF locked state to the idle state based on the status of the RF interface; and determining which of the RF interface or the wired interface may access the dual interface tag, wherein either the RF interface or the wired interface may access the dual interface tag in the idle state, a first register in an arbitration module is configured to indicate a status of the RF interface, and a second register in the arbitration module is configured to indicate a status of the wired interface.
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Specification