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Method for protecting configuration data from a data bus transceiver, data bus transceiver and data bus system

一种数据总线、配置数据的技术，应用在数字传输系统、传输系统、总线网络等方向，能够解决没有通过信号告知等问题，达到提高系统可用性、降低可能性、减少安全临界状况的效果

Inactive Publication Date: 2018-01-02
CONTINENTAL TEVES AG & CO OHG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These failures are problematic because they do not signal

Method used

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  • Method for protecting configuration data from a data bus transceiver, data bus transceiver and data bus system

Examples

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Embodiment Construction

[0022] figure 1 A schematic diagram of an exemplary embodiment of a PN-CAN transceiver 1 according to the invention is shown, in which only elements relevant for the description of the invention are depicted. The CAN differential signal incoming via the CAN data bus is converted in a manner known per se using a comparator 10 into a bit sequence, sampled (block) 9 and decoded by means of a decoder 8 . The decoded CAN message is then compared with the data stored in Configuration Register 2. In the case of a match, a corresponding wake-up signal WUF is output to the associated electronic control unit. The data stored in the configuration register 2 define under which conditions or under which CAN messages arrive the transceiver 1 activates the electronic control unit assigned to it. In the case of an error detected during decoding or when the limit value of the error counter is reached, a wake-up signal F indicating this error is output to the electronic control unit.

[0023...

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Abstract

The invention relates to a method for protecting configuration data from a data bus transceiver (1) that can be operated in a subnetwork mode, wherein the configuration data are provided for comparison with data from data bus messages arriving via a data bus (CAN), wherein a reference checksum for the configuration data is generated and stored, this reference checksum is recurrently checked, and in the event of an alteration being identified, a wake-up signal (WUF) and / or a piece of error information (F) is output. During or after writing of the configuration data to configuration register 2 via data bus SPI or directly before the change to the low-power mode of the electronic control unit, checksum unit 3 is used to form a checksum that is stored in reference checksum register 4.1. In thelow-power mode of the electronic control unit, the checksum for the configuration is repeatedly recomputed and compared with the checksum stored in reference checksum register 4.1. Checksum unit 3 stores the recomputed checksum value in checksum register 4.2, and comparison unit 5 then performs a comparison between the data stored in reference checksum register 4.1 and the recomputed checksum stored in reference checksum register 4.2. If the recomputed checksum does not match the stored checksum, then comparison unit 5 is used to trigger a wake-up process on the basis of a configuration errorKF. The start of a check can be brought about by internal and / or external triggers.

Description

technical field [0001] The invention relates to a method for protecting configuration data of a data bus transceiver according to the preamble of claim 1 , a data bus transceiver according to the preamble of claim 8 and corresponding data for a motor vehicle bus system. Background technique [0002] Data bus systems are used in various technical fields. Examples of this include automotive and aircraft technology, in which in particular a bus system such as the CAN bus (Controller Area Network) is used for the communication of electronic control units (ECU). [0003] A data bus transceiver, which is capable of operating in a partial-networking (PN), includes a decoder with which incoming bus messages can be read and decoded in a low-power mode. In order to implement a local network, these transceivers must be configured after voltage is applied. The configuration may include, for example, an identifier (ID) identifying the content of the message, an identifier mask (IDM), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/40H04L12/12
CPCH04L12/12H04L12/40039H04L2012/40215Y02D30/50H04B1/38
Inventor T·贝克曼I·亚尼塞夫斯基C·科尼利厄斯R·加赫F·米歇尔
Owner CONTINENTAL TEVES AG & CO OHG
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