SG2 on the side of the source line, respectively. [0044] The bit line control circuit 2 is formed mainly of a flip-flop and performs the sense operation for reading the latched program data and the bit line potential, and the sense operation for the verify read after the programming or the latch of the reprogrammed data. [0045]FIGS. 2A and 2B are a plan view and an equivalent circuit diagram, res