| 摘要 |
PURPOSE:To prevent an erroneous inspection, and to raise reliability by extracting as an inspecting object only an effective information of an illegal information inputted and generated from the middle of an information flowing in a circuit, and discarding other information. CONSTITUTION:When a protocol inspecting device C is started, a starting circuit SC starts a timing circuit TC, a switching circuit SW and a receiving circuit RC by signal lines (b)-(d). The circuit RC sends out a receiving information to the circuit SW, transfers it to an initial legal information detecting circuit IC when the circuit SW is in a state A, and shifts it to a state B. The circuit IC discriminates whether the receiving information is an illegal information being below one information unit or not, and in case when it is illegal, the receiving information is discarded, and as for a normal information, an inspection is executed by a protocol inspecting circuit PC. Also, when the circuit TC is started by the circuit SC, a timing of the maximum time portion required for receiving one information unit is counted, the circuit SW is set to the state B at the time of time-out, and a received data of the circuit RC is transferred as it is to the device PC. |
