| 摘要 |
PROBLEM TO BE SOLVED: To provide a computer memory having a memory checking means which is capable of effectively detecting abnormality of a decoding circuit specifying an accessing address. SOLUTION: The computer memory comprises a ROM 1, the decoding circuit 5, and a ROMSUM 201-218 (a memory checking means) for detecting abnormality of the decoding circuit 5. The ROMSUM has an ascending order addition processing routines 202-209 (ascending order adding means) and a descending order addition processing routines 210-217 (descending order adding means), and executes the routines 202-209 and the routines 210-217, alternately. When an operation result obtained by the routines 202-209 or by the routines 210-217 is not matched with addition data ROM-SUM adding all the data in each address of the ROM 1, the decoding circuit 5 is determined to be abnormal. |
