Patent ID: 9413566
Filing Date: 2016-08-09
CPC Classification: H04L

Claim Text:
1. A signal transmission circuit connected to a transmission line that includes a pair of signal lines and transmits a differential signal changing between binary levels of recessive and dominant, the signal transmission circuit comprising: a transceiver that encodes a transmission data, transmits the transmission data to the transmission line, and decodes a signal received from the transmission line to generate a received data; an impedance adjustment circuit that realizes a low impedance state of the transmission line by connecting a resistance component between the pair of signal lines and a normal state of the transmission line by disconnecting the resistance component; a first control circuit that controls the impedance adjustment circuit to realize the low impedance state for a fixed period that is shorter than a width of one bit, when a change of a signal level on the transmission line is detected; and a second control circuit that controls the impedance adjustment circuit according to the transmission data, when detecting that a communication frame wins an arbitration by comparing the transmission data and the received data, to realize the low impedance state in an entire period where a signal level on the transmission line is recessive until transmission of the communication frame winning the arbitration ends.