Low redundancy overhead multibit error correction in memory

As technology scales, memories have become more susceptible to radiation induced multiple bit upsets (MBUs). Multibit error correction codes (MECC) are an effective approach to mitigate MBUs in memories. This paper proposes a new codeword structure to protect memory against MBUs. Euclidean Geometry Low Density Parity Check (EG-LDPC) codes and Hamming codes are combined in the proposed codeword to assure the reliability of memory with low redundancy overhead. Furthermore, the proposed codeword can protect some longer data which is difficult for other MECCs to deal with. By using the proposed codeword, both low redundancy overhead scheme and long data width scheme for multibit error correction are presented. Finally, the proposed schemes have been implemented in Verilog and validated through a wide set of simulations. The experiment results reveal that the proposed method has a superior protection level. Compared with general MECC, it has lower redundancy and performance overheads.