| 摘要 |
PURPOSE:To realized the diagnosis of a common bus and a bus connection circuit with simple constitution by comparing the signals of the content of a diagnostic mode storage part and a diagnostic signal line, and setting a compared result as the module selection condition at the time of giving the diagnosis. CONSTITUTION:A private line 4 to indicate a diagnostic mode and the diagnostic signal line 30 to represent the diagnostic data transfer of the common bus 3 are provided. In functional modules (2a-2n), the diagnostic mode storage part 200 on which diagnostic mode indication is set from the private line 4 and a comparison part 201 to compare the content of the diagnostic mode storage part 200 with the signal of the diagnostic signal line 30 are provided. The data transfer in the diagnostic mode can be separated from that in a normal mode setting the result of the comparison part 201 as the module selection condition at the time of giving the diagnosis. |
