Patent ID: 8068379
Filing Date: 2011-11-29
Classification: G11C,H01L

Abstract:
1. A dynamic random access memory comprising: a plurality of memory cell areas arranged in an array, each of which has a plurality of sub word lines, a plurality of bit lines orthogonally intersecting said plurality of sub word lines, and a plurality of dynamic memory cells provided at intersections between said plurality of sub word lines and said plurality of bit lines; a plurality of first areas, each of which includes a sub word line driving circuit and is arranged between said plurality of memory cell array areas adjacent to each other along the extended direction of said plurality of sub word lines; a plurality of second areas, each of which includes a sense amplifier circuit and is arranged between said memory array areas adjacent to each other along the extended direction of said plurality of bit lines; a plurality of third areas, each of which is arranged between said plurality of first areas adjacent to each other; a plurality of main word lines, each of which is extended over said plurality of first areas and said plurality of memory cell array areas and is assigned with two or more sub word lines in each corresponding memory array cell area; a plurality of first select lines, which are arranged in parallel to said plurality of main word lines to transmit a select signal for selecting one of said two or more sub word lines assigned to a predetermined one of said plurality of main word lines; and a plurality of second select lines, which are connected to said plurality of first select lines and are extended over adjacent ones of said plurality of first areas via predetermined one of said plurality of third areas to transmit said select signal to said sub word line driving circuit of each of said plurality of first areas adjacent to each other; wherein one of said plurality of sub word lines assigned to the select main word line is selected by the predetermined sub word line driving circuit that receives a signal from said plurality of second select lines and a signal from said selected main word line.