Non-volatile semiconductor memory device in which read, write and erase operations can be simultaneously performed in different memory cell array blocks

A non-volatile semiconductor memory device, comprising a plurality of memory cell array blocks on a single integrated circuit, each of the blocks including:

• non-volatile memory transistors capable of electrically writing, erasing, and reading information, the transistors being arranged in a matrix, and sources of all of the transistors being commonly connected;
• a plurality of word lines for commonly connecting control gates of the transistors in each identical row of the matrix;
• a plurality of bit lines for commonly connecting drains of the transistors in each identical column of the matrix;
• a bit line selection circuit for selectively connecting the plurality of bit lines to a data bus in accordance with a signal value of a first predetermined portion of an input address signal;
• and
• a voltage selection output circuit for selectively outputting a predetermined voltage to the commonly connected sources at a time of writing, erasing, or reading information;
• wherein the plurality of word lines of each of the blocks are respectively connected to the corresponding word lines in an adjacent block through a group of switching transistors provided between the blocks,
• at least two word line selection circuits are further included which output a predetermined word line selection signal in accordance with a signal value of a second predetermined portion of the input address signal,
• the plurality of word lines of a predetermined pair of two blocks among the plurality of blocks are respectively connected to the corresponding word line selection circuits, and
• each of the bit line selection circuits connects the bit line selected in accordance with the signal value of the first predetermined portion of the input address signal alternatively to either of the two data buses.