ERROR-CORRECTING DEVICE AND DECODER ENABLING FAST ERROR CORRECTION WITH REDUCED CIRCUIT SCALE

摘要

PURPOSE: An error-correcting device is provided to achieve reduction in the time required for error check by shortening the access time to a memory device and performing the error check in parallel with error correction without increasing the circuit scale. CONSTITUTION: A data buffer(14) receives and temporarily stores data including a product code enabling error correction in first and second directions. An exclusive-OR operation circuit(9) uses an error amount detected by error correction in the first direction and data stored in a storage element(11) to calculate a first error check result. A PI direction error-checking circuit(3) according to the first error check result performs error check after error correction in the first direction. A PO direction partial error-checking circuit(8) and a PO direction aggregate error-checking circuit(6) use an error amount detected in error correction in the second direction and calculate a second error check result. The first and second error check results are used to generate a final error check result by an exclusive-OR operation circuit(5).