US Patent 10270471 Memory system having ECC self-checking function and associated method

A memory system having an error correction codes (ECC) self-checking function is disclosed. The memory system includes: an ECC encoder, used to convert input information bits into a codeword; a memory, coupled to the ECC encoder, the memory being used to store the codeword; and an ECC decoder, coupled to the memory and the ECC encoder, the ECC decoder being used to generate a syndrome of the codeword; wherein when the memory system is operated in an on-line self-checking mode and the codeword is fed into the memory from the ECC encoder, the codeword is as well fed into the ECC decoder from the ECC encoder to generate the syndrome.