High Detection Rate BCH Code with CRC Code for Memory Application

With the aggressive scaling of DRAM process technology, the reliability degradation has become a critical issue, which inevitably increases the demand for more powerful error correction code (ECC) than conventional Hamming code. Although double error correction (DEC) BCH code needs less parity bits than other DEC codes, it cannot detect the errors larger than 3 bits. In this paper, we present a novel BCH code combined with cyclic redundancy check (CRC) code which can effectively detect multi-bit errors. By employing the CRC code, the proposed BCH code corrects double errors with a 3-bit error detection probability of 84%. In addition, by reusing the BCH encoder as CRC encoder and decoder in the proposed BCH, the area overhead of the proposed BCH is only 7.8
^%
compared to the conventional BCH code.