![]() However, the number of transmitted bits in the CAN frames varies depending on the automatically introduced stuff-bits. However, this is only true for a fixed data length. The polynomial is also able to detect burst-errors up to 15 bit. This means that five randomly distributed bit failures are detectable. In Classical CAN, a 15-bit CRC polynomial is used (x 15 + x 14 + x 10 + x 8 + x 7 +x 4 +x 3 + x 0). In case of a mismatch, the receiving node sends an Error Frame after the ACK delimiter. If it matches, the frame is regarded as correctly received and the receiving node transmits a dominant state in the ACK slot bit, overwriting the recessive state of the transmitter. The self-calculated check sum is compared with the received on. ![]() The receivers use the same polynomial to calculate the check sum from the bits as seen on the bus-lines. CAN data frames and remote frames contain a safeguard based on a CRC polynomial: The transmitter calculates a check sum from the transmitted bits and provides the result within the frame in the CRC field. ![]()
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