CONTROL DEVICE AND CONTROL METHOD

PROBLEM TO BE SOLVED: To prevent processing from being continued in an unstable state by immediately and reliably detecting a failure. SOLUTION: A control device includes a system-A processor collation circuit 212 which detects whether system-A information from a system-A processor 202 is the same as system-B information from a system-B processor 203 or not, and controls access of system-A access information which is either the system-A information or the system-B information to a main memory based on the detection result and instructions from the system-A processor and the system-B processor. When the system-A information is the same as the system-B information, the main memory is accessed by using one of the information specified in advance, as access information. When the system-A information is different from the system-B information, access to the main memory is prohibited. Further, whether system-A access information is the same as system-B access information is detected. An interruption is requested to the system-A processor or the system-B processor based on the detection results of logic collation circuits 213, 217. COPYRIGHT: (C)2011,JPO&INPIT