| 摘要 |
PURPOSE:To output a correct read-out data of all addresses, in case when addresses having a faulty bit of each memory are different from each other, by selecting one of read-out data from plural memories by an error output signal of a checking circuit. CONSTITUTION:This device has memories MEMI, MEMZ, and writes the same data simultaneously in each memory when writing, and selects and outputs one of read-out data of each memory by a selecting circuit when reading out. In this case, an error of each read-out data is checked by a checking circuit 4, and one of read-out data is selected by the selecting circuit 1 in accordance with an error output signal S, therefore, even if each memory has a faulty bit, a correct read-out data is outputted relating to all addresses having a read-out request, in case when addresses having a faulty bit are different from each other in each memory. |
