Method of and device for bringing a network interface out of a sleep mode into a wake-up state
First Claim
1. A device for activating a network interface of a computer controlled network including two bus lines and at least two substations each including a network interface switchable into a sleep mode or a wake-up mode of operation, each of the network interfaces connecting a signal transmitting part and a signal receiving part of an assigned substation to said bus lines, and each including means for detecting a fault occurring on one of said bus lines during the wake-up mode, said activating device comprising means for detecting a flank change of a signal on the respective bus lines;
- means for generating a wake-up signal in response to the detection of a signal flank change on one of the two bus lines; and
said wake-up signal activating a network interface out of a sleep mode into a wake-up mode.
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Accused Products
Abstract
An activation device for bringing an network interface of a computer network for a motor vehicle, with at least two bus lines, out of a sleep mode into a wake-up mode. The activation device includes a signal flank change detection circuit, which is coupled to the bus lines and a reference voltage. In the event of an interruption or in the event of a short-circuit of one of the bus lines to ground or to a supply voltage of the computer network, the circuit evaluates a signal arriving on the other, intact bus line and emits a wake-up signal for the activation of the network interface. The flank change detection circuit has two comparators (5, 7), which are connected to the bus lines (U-, U+) and via a voltage divider (19) to a reference voltage (Vcc /2). A voltage offset is produced by the voltage divider (19), by which offset the network interface can be brought into wake-up mode in the event of a short-circuit of the bus lines between each other, even if it was in sleep mode when the fault occurred.
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Citations
8 Claims
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1. A device for activating a network interface of a computer controlled network including two bus lines and at least two substations each including a network interface switchable into a sleep mode or a wake-up mode of operation, each of the network interfaces connecting a signal transmitting part and a signal receiving part of an assigned substation to said bus lines, and each including means for detecting a fault occurring on one of said bus lines during the wake-up mode, said activating device comprising means for detecting a flank change of a signal on the respective bus lines;
- means for generating a wake-up signal in response to the detection of a signal flank change on one of the two bus lines; and
said wake-up signal activating a network interface out of a sleep mode into a wake-up mode. - View Dependent Claims (2, 3, 4, 5, 6)
- means for generating a wake-up signal in response to the detection of a signal flank change on one of the two bus lines; and
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7. A method of activating a network interface of a computer controlled network including two bus lines and at least two substations each including a network interface switchable into a sleep mode or a wake-up mode of operation, each of the network interfaces connecting a signal transmitting part and a signal receiving part of an assigned substation to said bus lines, and each including means for detecting a fault occurring on one of said bus lines during the wake-up mode, the method comprising the steps of detecting a flank change of signals arriving on the respective bus lines;
- and, on detection of a signal flank change on at least one bus line, activating a network interface out of a sleep mode into a wake-up mode.
- View Dependent Claims (8)
Specification