SEMICONDUCTOR MEMORY DEVICE PERFORMING RANDOMIZATION OPERATION

Provided herein is a semiconductor memory device. The semiconductor memory device may include a plurality of planes including a plurality of memory cells, read/write circuits coupled to the plurality of planes, respectively, and temporarily storing normal data inputted from an external device, random data, and parity data, and an error correction circuit generating the random data by randomizing the normal data, generating parity data for the random data during a program operation, correcting an error of the random data by using the parity data and de-randomizing the random data during a read operation.