SEMICONDUCTOR MEMORY DEVICES AND MEMORY SYSTEMS

The invention discloses a semiconductor memory device and a memory system. A semiconductor memory device includes a memory cell array and an interface circuit including an error correction code (ECC) engine. The memory cell array includes a plurality of volatile memory cells, a normal cell region and a parity cell region. The interface circuit, in a write operation, receives main data and first parity data from an external device, the first parity data being generated based on a first ECC and stores the main data in the normal cell region and the first parity data in the parity cell region. The interface circuit, in a read operation, performs an ECC decoding on the main data using a second ECC, based on the first parity data to correct a first type of error in the main data. The second ECC has a parity check matrix which is the same as a parity check matrix of the first ECC. 公开了半导体存储器装置和存储器系统。所述半导体存储器装置包括存储器单元阵列和包括纠错码(ECC)引擎的接口电路。存储器单元阵列包括多个易失性存储器单元、正常单元区域和奇偶校验单元区域。在写入操作中，接口电路从外部装置接收主数据和第一奇偶校验数据，并且将主数据存储在正常单元