US Patent 7755944 Semiconductor memory device

An electrically erasable programmable non-volatile semiconductor memory device. The semiconductor memory device includes a memory cell array comprising a plurality of memory blocks, each memory block comprising a plurality of memory cells, a dummy memory cell, and a select gate transistor. Transfer transistors each having a current path connected between a corresponding wordline enable signal line and a corresponding wordline are controlled by an output of a block selection circuit. The transfer transistors include a dummy transfer transistor electrically coupled to the dummy memory cell, and configured to transmit a dummy wordline enable signal.