ERROR DETECTION TEST DEVICE FOR A SUBSCRIBER STATION OF A SERIAL BUS SYSTEM, AND METHOD FOR TESTING MECHANISMS FOR DETECTING ERRORS IN A COMMUNICATION IN A SERIAL BUS SYSTEM

摘要

The invention relates to an error detection test device (15; 25; 35) for a subscriber station (10; 20; 30) of a serial bus system (1). The error detection test device (15; 25; 35) has an evaluation module (153) for evaluating which bit of a signal (TXD; RXD) must be disrupted so that the receiver of the resulting signal (TXD; RXD) in which the at least one bit is disrupted can test the functionality of a specified error detection mechanism. The signal (TXD; RXD) is processed by a protocol control unit (111) during the operation of the subscriber station (10; 20; 30) so as to be transmitted as a frame (450) to a bus (40) of the bus system (1) or in order to decode the signal (RXD) from the frame (450) after the frame (450) is received by the bus (40). The error detection test device also has an output terminal (156) for outputting a switch signal (SJNV) to the protocol control unit (111) in order to disrupt the at least one bit evaluated by the evaluation module (153) in the signal (TXD; RXD) output by the protocol control unit (111), wherein the evaluation module (153) is designed to generate the switch signal (S_INV) on the basis of the at least one bit evaluated by the evaluation module (153).