| 摘要 |
<p>PURPOSE:To improve the reliability of read data by providing a second error detecting means, which detects whether error occurs or not when data is written in an read from the address from which read data is read, besides a read data error detecting means using an error detection code. CONSTITUTION:A first error detecting means 2 and a second error detecting means 3, are provided the first means 2 detects whether read data read from a designated address of a storage device 1 includes error or not in accordance with the error detection code, and the second means 3 detects whether error occurs when data is written in and read from the address from which read data is read. Besides error detection by the first conventional error detecting means 2, error detection is performed by the second error detecting means 3 as follows; check data different from read data is written in the same address as read data of the storage device and is immediately read out, and write data and read data are collated to check whether address error exists or not.</p> |
