| 摘要 |
PROBLEM TO BE SOLVED: To monitor and make graspable whether a trouble occurs to data stored in an associative memory (CAM) by reading out data in RAM mode and comparing the parity of the data with parity added when the data are stored in the CAM. SOLUTION: A CAM monitor part 40, when receiving a CAM monitor indication signal from a CAM control circuit 10, supplies an address to the CAM 30 and reads out data in RAM mode. Then parity operation is performed for the read data and it is compared with the parity bit added previously at the time of data storage. It is decided that the read data are free of trouble when the parity bits match each other and the data have trouble when not, and the alarm means 50 is reported to a CAM control circuit 10. Consequently, when the data in the CAM 30 have a trouble, an abnormality can be detected. |
