发明公开
EP3289726A1 VERFAHREN ZUR ABSICHERUNG VON KONFIGURATIONSDATEN EINES DATENBUS-TRANSCEIVERS, DATENBUS-TRANSCEIVER UND DATENBUSSYSTEM 审中-公开
用于保护数据总线收发器,数据总线收发器和数据总线系统的配置数据的方法

VERFAHREN ZUR ABSICHERUNG VON KONFIGURATIONSDATEN EINES DATENBUS-TRANSCEIVERS, DATENBUS-TRANSCEIVER UND DATENBUSSYSTEM
摘要:
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 the low-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 error KF. The start of a check can be brought about by internal and/or external triggers.
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