| 摘要 |
PURPOSE:To perform a fault test automatically at the time of transmitting/ receiving data, by providing a comparison circuit between a frame number register in which a pseudo fault is generated and a transmission frame, and a means possible to designate the kind of the pseudo fault and substitute data, and the decision of an intermittent fault or a permanent fault. CONSTITUTION:In a CRC fault generation method, when the frame number register FN32 coincides with the frame number of a TCD22 at the comparator 37, and also, the indication of the generation of the fault is issued at a fault generating register ES33, an input data bit is inverted, and abnormal data is transmitted at the time of transmitting a CRC by performing an ordinary polynomial arithmetic operation. In a DEL(delimiter) fault generation method, the output of an AND circuit 44 prohibits the output of a DELGEN15 at an AND circuit 16, and transmits no DEL. In a TF(time fill) fault generation method, the output of an AND circuit 45 prohibits the output of a TFGEN13 at an AND circuit 14, and transmits no TF. In such a way, it is possible to generate the abnormality of a various kinds of transmission data falsely or dynamically in data communication. |
