Semiconductor memory device

Abstract

A semiconductor memory device provided with a new bit line hierarchization method that enables further reduction of power consumption is provided. The semiconductor memory device includes multiple memory blocks provided in a matrix configuration and multiple main bit lines provided in correspondence with the memory blocks. Each of the memory blocks includes: multiple memory cells provided in a matrix configuration; multiple sub bit lines provided on a column-by-column basis; multiple word lines provided with respect to each of columns and rows and common to multiple memory blocks; and a switch circuit that couples a corresponding main bit line to any of the sub bit lines. In the operation of reading a target cell as the target of read, a main bit line corresponding to the target cell is selected, a sub bit line corresponding to the column of the target cell is selected through the switch circuit; and a word line corresponding to the column and the row of the target cell is selected from among the word lines.