| 摘要 |
PURPOSE:To correct the errors with high efficiency by providing a move-in processing means and a store processing means which generates a new vertical parity from the store data and finally writes the store data and the vertical parity into a buffer storage part. CONSTITUTION:A move-in processing means 15 writes a vertical parity produced from the move-in data into a buffer storage part 13 in a move-in processing state. A store processing means 17 reads the data on a store destination and the vertical parity of the block to which the data belong out of an arithmetic unit in a store processing state. Then the means 17 produces a new vertical parity from those store data and finally writes the store data and the vertical parity into the part 13. Then the vertical parity read out of the arithmetic unit in the store processing state is compared with the produced vertical parity for correction of errors. In such a way, the errors are corrected with high efficiency. |
