Semiconductor memory device implementing multi-bank configuration with reduced number of signal lines

摘要

A memory cell array in a semiconductor memory device according to the present invention is divided into a plurality of banks along the row-direction. Each bank is further divided into a plurality of sub blocks along the column-direction. Sub blocks belonging to the same group, in other words, sub blocks arranged adjacent to each other along the row-direction share the same row address. An accessing operation to an addressed memory cell is performed on the basis of a sub block. The activation of a sub block is performed by a control circuit provided for each of the sub blocks based on a signal activated for each of the banks and the same group based on an address signal.