Method and device to wake-up nodes in a serial data bus
First Claim
1. A method of communication in a multi-master system comprising:
- sending communication signals switched between dominant and recessive values at clock intervals in frames over a serial data bus from at least one of a plurality of sending nodes to a plurality of receiving nodes said frames including an identifier field, and said receiving nodes having an operational state and a standby state in which the current consumption of the node is reduced compared to said operational state, said receiving nodes including wake-up trigger circuitry for triggering transition from said standby state to said operational state in response to said communication signals;
wherein said identifier field includes at least one position at which said communication signal remains at said recessive value during at least two successive clock intervals so as to define an identifier code, and said trigger circuitry is selectively responsive to said position for triggering said transition from said standby state to said operational state, the trigger circuitry of at least one of said receiving nodes being responsive to more than one different identifier code so as to be capable of being triggered by any one of a plurality of sending nodes.
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Accused Products
Abstract
A method of communication comprising sending communication signals switched between dominant and recessive values at clock intervals in frames over a serial data bus from at least one of a plurality of sending nodes to a plurality of receiving nodes. The receiving nodes have an operational state and a standby state in which the current consumption of the node is reduced compared to the operational state. The receiving nodes include wake-up trigger means for triggering transition from the standby state to the operational state in response to the communication signals. The frames of the transmitted signals include an identifier field during which the communication signal alternates between the dominant and recessive values in successive clock intervals with at least one significant occurrence during which the communication signal remains at one of the dominant and recessive values during at least two successive clock intervals, and the trigger means is selectively responsive to the position of the occurrence within the identifier field for triggering the transition from the standby state to the operational state.
33 Citations
16 Claims
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1. A method of communication in a multi-master system comprising:
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sending communication signals switched between dominant and recessive values at clock intervals in frames over a serial data bus from at least one of a plurality of sending nodes to a plurality of receiving nodes said frames including an identifier field, and said receiving nodes having an operational state and a standby state in which the current consumption of the node is reduced compared to said operational state, said receiving nodes including wake-up trigger circuitry for triggering transition from said standby state to said operational state in response to said communication signals; wherein said identifier field includes at least one position at which said communication signal remains at said recessive value during at least two successive clock intervals so as to define an identifier code, and said trigger circuitry is selectively responsive to said position for triggering said transition from said standby state to said operational state, the trigger circuitry of at least one of said receiving nodes being responsive to more than one different identifier code so as to be capable of being triggered by any one of a plurality of sending nodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of communication comprising
sending communication signals switched between dominant and recessive values at clock intervals in frames over a serial data bus from at least one of a plurality of sending nodes to a plurality of receiving nodes, said frames including an identifier field, and said receiving nodes having an operational state and a standby state in which the current consumption of the node is reduced compared to said operational state, said receiving nodes including wake-up trigger circuitry for triggering transition from said standby state to said operational state in response to said communication signals; -
wherein said identifier field includes at least one position at which said communication signal remains at one of said dominant and recessive values during at least two successive clock intervals so as to define an identifier code, and said trigger circuitry is selectively responsive to said position for triggering said transition from said standby state to said operational state; wherein said frames of said communication signals comprise a data field, said identifier field preceding said data field, and wherein during said data field said communication signal alternates between said dominant and recessive values in successive clock intervals with at least one position at which said communication signal remains at one of said dominant and recessive values during at least two successive clock intervals. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification