Method and Device to Wake-Up Nodes in a Serial Data Bus
First Claim
1. 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 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, characterised in that said frames include an identifier field during which said communication signal alternates between said dominant and recessive values in successive clock intervals with at least one significant occurrence during which said communication signal remains at one of said dominant and recessive values during at least two successive clock intervals, and said trigger circuitry is selectively responsive to the position of said occurrence within said identifier field for triggering said transition from said standby state to said operational state.
29 Assignments
0 Petitions
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.
42 Citations
9 Claims
-
1. 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 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, characterised in that said frames include an identifier field during which said communication signal alternates between said dominant and recessive values in successive clock intervals with at least one significant occurrence during which said communication signal remains at one of said dominant and recessive values during at least two successive clock intervals, and said trigger circuitry is selectively responsive to the position of said occurrence within said identifier field for triggering said transition from said standby state to said operational state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
9-10. -10. (canceled)
Specification