| 摘要 |
An error correction device for reducing the amount of access to an external memory while preventing the capacity of an internal memory from increasing. An optical disc stores scramble data for each data block. A descramble circuit reads scramble data in the data blocks from the optical disc as read blocks and applies a predetermined scramble value to the scramble data of each read block to generate descramble data. A 1-shift calculator generates a first calculated value by shifting the scramble value by one byte using a generation polynomial. A second shift calculator generates a second calculated value by shifting the scramble value by a number of bytes corresponding to {(total bytes of the data block in the column direction)+1−(total bytes of each read block in the column direction)} using the generation polynomial. An EOR circuit generates descramble data by applying the first or second calculated value as the scramble value to the input scramble data. |
