| 摘要 |
PURPOSE:To surely detect abnormality when this abnormality exists at one bit of an address or data. CONSTITUTION:Data are prepared just for the number of bits adding address information and data generated from a CPU 1 by a memory controller 4, check data to affect the respective three bits of data are generated by masking these data based on the address information and the data and taking the even numbered parity, and these check data are stored in a memory 9 for check. Afterwards, data stored in a memory 7 for data are read out, consistence between these data and the check data is checked, and the memory check is performed. |
