SEMICONDUCTOR MEMORY DEVICE CAPABLE OF PERFORMING REFRESH OPERATION WITHOUT AUTO REFRESH COMMAND AND MEMORY SYSTEM INCLUDING THE SAME

摘要

Disclosed are a semiconductor memory device capable of performing a refresh without using an auto refresh command, and a memory system including the same. The semiconductor memory device includes an internal address generation circuit, an internal command generation circuit, and a memory cell array, and when a read or write command is input, some memory bank (s) of the first memory bank group are read. Alternatively, when performing a write operation, the remaining memory bank (s) of the first memory bank group may perform a refresh operation. Therefore, the semiconductor memory device is easy to address and can use all the data bandwidths, and the latency does not change.