Semiconductor memory device and method for writing data

1. A semiconductor memory device comprising a memory array including a plurality of memory cells capable of storing data of at least 1 bit, the semiconductor memory device comprising:

a data write control section for controlling a data write operation to the plurality of memory cells;

an address signal generation section for generating an address signal which represents an address of a prescribed memory cell to which data is to be written, among the plurality of memory cells;

a data read section for reading data from the prescribed memory cell;

a buffer section for temporarily storing data to be written to the prescribed memory cell;

a determination section for determining whether or not to write data to the prescribed memory cell and outputting a first write signal based on the determination result;

a data register section for storing data represented by the first write signal and outputting a second write signal based on the stored data; and

a data write section for writing data to the prescribed memory cell based on the second write signal,

wherein the data register section stores the data represented by the first write signal based on a control signal which is output by the data write control section.

2. A semiconductor memory device according to claim 1 , wherein the data register section includes a plurality of registers, and stores the data represented by the first write signal to a register, among the plurality of registers, corresponding to the address represented by the address signal.

3. A semiconductor memory device according to claim 1 , wherein when it is not necessary to write data to the prescribed memory cell, the data register section fixes the stored data to a prescribed value so as to prevent the data from being written to the prescribed memory cell.

4. A semiconductor memory device according to claim 1 , wherein the data read section reads data from at least two memory cells among the plurality of memory cells simultaneously.

5. A semiconductor memory device according to claim 1 wherein:

the determination section outputs feedback data for updating the data stored in the buffer section, and

the buffer section updates the data stored therein based on the feedback data in accordance with a control signal which is output by the data write control section.

6. A semiconductor memory device according to claim 5 , wherein when it is not necessary to write data to the prescribed memory cell, the buffer section updates the stored data to a prescribed value so as to prevent the data from being written to the prescribed memory cell.

7. A semiconductor memory device according to claim 5 , wherein the data read section reads data from at least two memory cells among the plurality of memory cells simultaneously.

8. A semiconductor memory device according to claim 5 , wherein the data stored in the buffer section is updated to the data stored in the prescribed memory cell based on the feedback data before data is written to the prescribed memory cell.

9. A method for writing data to a memory array included in a semiconductor memory device, wherein the memory array includes a plurality of memory cells capable of storing data of at least 1 bit, the method comprising the steps of:

generating an address signal which represents an address of a prescribed memory cell to which data is to be written, among the plurality of memory cells;

reading data from the prescribed memory cell;

temporarily storing data to be written to the prescribed memory cell;

determining whether or not to write data to the prescribed memory cell and outputting a first write signal based on the determination result;

storing data represented by the first write signal and outputting a second write signal based on the stored data; and

writing data to the prescribed memory cell based on the second write signal.

10. A method according to claim 9 , further comprising the steps of:

outputting feedback data for updating the temporarily stored data; and

updating the temporarily stored data based on the feedback data.