Non-volatile semiconductor storage device

A non-volatile semiconductor storage device comprising:

• a memory cell array including a plurality of non-volatile semiconductor memory elements, each memory element storing data in a non-volatile manner;
• a shift register storing data read from the semiconductor memory element and sequentially transferring the data outside, the shift register also storing data transferred from outside and storing the data in the semiconductor memory element;
• a syndrome generation circuit connected to an output terminal of the shift register, the syndrome generation circuit generating syndrome of data output from the output terminal;
• and
• an error-correction circuit using the data and the syndrome to correct an error of the data,
• wherein the shift register includes m pieces of data registers connected in series to store m-bit data, and
• when the syndrome generation circuit generates the syndrome, the m-bit data is cycled in the shift register and is returned to the original data register.

A non-volatile semiconductor storage device comprising:

• a memory cell array including a plurality of non-volatile semiconductor memory elements, each memory element storing data in a non-volatile manner;
• a shift register storing data read from the semiconductor memory element and sequentially transferring the data outside, the shift register also storing data transferred from outside and storing the data in the semiconductor memory element;
• a syndrome generation circuit comprising an exclusive logic OR circuit to generate syndrome of data stored in the shift register;
• and
• an error-correction circuit using the data and the syndrome to correct an error of the data;
• wherein the syndrome generation circuit inputs the output signal from the shift register in a syndrome generation period, and inhibits the input of the output signal in an error-correction period in the error-correction circuit;
• wherein the shift register, the syndrome generation circuit, and the error-correction circuit are connected in series in a block, and a plurality of the blocks are connected in series.