| 摘要 |
PURPOSE:To detect an abnormal operation which is low in reproducibility by causing a comparator to output a discordance signal when discordance occurs among input-output signals while a substitute microprocessor repeatedly executes the same program under the same condition. CONSTITUTION:In the first place, a substitute microprocessor 11 is caused to execute a program and the input-output signals produced during the execution are acquired by a tracing function, etc., and stored in a memory 24 for comparison. Then the emulation of the substitute microprocessor 11 is again executed under the same condition and the trace information obtained during the second execution is compared with the content of the memory 24 at every cycle. When they do not coincide with each other, a trigger signal of break, etc., is formed. Since a discordance signal is outputted from a comparator when discordance occurs among input-output signals in such way, a break process, trace stopping process, etc., can be actuated by using the discordance signal as a trigger signal and even an abnormal operation which is low in reproducibility can be detected. |
