| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for detecting a fault generated on a line for the address input of a memory. SOLUTION: A CPU 102 inputs an address through an address line 103 to the memory 101. A fault generated on the address line 103, prescribed data different from the others are written to a predetermined address, the data of the address specified by changing a logic value by the unit of the address line 103 are read from the address and the read are compared with the prescribed data. By the comparison, it is judged that the fault is generated in the address line 103 for which the prescribed data are read even when the logic value is changed.
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