| 摘要 |
PURPOSE:To delete a memory circuit from a trouble suspected scope by providing a circuit to send writing information to a reading information fetching circuit as reading information. CONSTITUTION:At the time of writing to a memory circuit 1, a writing control signal 52 comes to be '1', and the contents of a writing data register 24 are sent to the memory circuit 1 through an error correcting code generating circuit 23 and a driver 20. Simultaneously, the information on a bidirectional bus 60 passes through an error correcting circuit 25 through a receiver 21 as reading information 51 and is set to a reading data register 26. Consequently, when an abnormality exists at writing information 50 transferred as the reading information 51, the abnormality is discovered by the error correcting circuit 25. When the abnormality is detected, a trouble suspected scope is over the position of circuits 23, 20, 21 and 25, and a comparing inspecting circuit 22 knows the inspecting result, and thus, the normality and abnormality of the circuits 20 and 21 can be separated from other circuit and the stopping of the trouble position can be executed. |
