Semiconductor memory device having data input/output line shared by a plurality of banks

Abstract

A semiconductor memory device having a structure in which a data input/output line is shared by a plurality of banks is provided. In the semiconductor memory device which has a memory block including a plurality of banks, data of a selected memory cell is input or output via a data input/output line. When data is written to a memory cell, the memory block is divided into at least two bank groups and the data input/output line is divided into at least two data input/output lines to separately connect the data input/output line to the respective bank groups so that the data is written to the selected memory cell via the data input/output line connected to a bank group including the selected memory cell. When data of a selected memory cell is read, the local data input/output lines are connected. Therefore, reduction of speed and power consumption is minimized and loads of data input/output lines are regulated during the read and write operations.