Semiconductor storage device and controller
A semiconductor storage device includes memory cells, select transistors, memory strings, first and second blocks, word lines, and select gate lines. In the memory string, the current paths of plural memory cells are connected in series. When data are written in a first block, after a select gate line connected to the gate of a select transistor of one of the memory strings in the first block is selected, the data are sequentially written in the memory cells in the memory string connected to the selected select gate line. When data are written in the second block, after a word line connected to the control gates of memory cells of different memory strings in the second block is selected, the data are sequentially written in the memory cells of the different memory strings in the second block which have their control gates connected to the selected word line.
1. A storage device comprising:
a first memory string including
a first select transistor,
a first memory cell, and
a second memory cell;
a second memory string including
a second select transistor,
a third memory cell, and
a fourth memory cell;
a bit line electrically connected to the first memory string and the second memory string;
a first select gate line electrically connected to a gate of the first select transistor;
a second select gate line electrically connected to a gate of the second select transistor;
a first word line electrically connected to a gate of the first memory cell and a gate of the third memory cell;
a second word line electrically connected to a gate of the second memory cell and a gate of the fourth memory cell; and
a control circuit configured to
perform a first operation, the first operation including
supplying a first program voltage to the first word line, and
supplying a first select voltage to the first select gate line,
perform a second operation after the first operation, the second operation including
supplying a second program voltage to the first word line, and
supplying a second select voltage to the second select gate line,
perform a third operation after the second operation, the third operation including
supplying a third program voltage to the second word line, and
supplying a third select voltage to the first select gate line, and
perform a fourth operation after the third operation, the fourth operation including
supplying a fourth program voltage to the second word line, and
supplying a fourth select voltage to the second select gate line.
2. The storage device according to claim 1 , wherein
the first select transistor, the first memory cell and the second memory cell of the first memory string are electrically connected in series, and
the second select transistor, the third memory cell and the fourth memory cell of the second memory string are electrically connected in series.
3. The storage device according to claim 1 , wherein
the second operation is performed immediately after the first operation, and
the fourth operation is performed immediately after the third operation.
4. The storage device according to claim 1 , wherein
in the first operation, first data is written in the first memory cell,
in the second operation, second data is written in the third memory cell,
in the third operation, third data is written in the second memory cell, and
in the fourth operation, fourth data is written in the fourth memory cell.
5. The storage device according to claim 1 , wherein
the first operation further includes
supplying a first transfer voltage to the second word line,
the second operation further includes
supplying a second transfer voltage to the second word line,
the third operation further includes
supplying a third transfer voltage to the first word line, and
the fourth operation further includes
supplying a fourth transfer voltage to the first word line.
6. The storage device according to claim 5 , wherein
the first to fourth program voltages are substantially the same,
the first to fourth select voltages are substantially the same, and
the first to fourth transfer voltages are substantially the same.
7. A storage system comprising:
a storage device including:
a first memory string including
a first select transistor,
a first memory cell, and
a second memory cell;
a second memory string including
a second select transistor,
a third memory cell, and
a fourth memory cell;
a bit line electrically connected to the first memory string and the second memory string;
a first select gate line electrically connected to a gate of the first select transistor;
a second select gate line electrically connected to a gate of the second select transistor;
a first word line electrically connected to a gate of the first memory cell and a gate of the third memory cell;
a second word line electrically connected to a gate of the second memory cell and a gate of the fourth memory cell; and
a control circuit; and
a controller device configured to send an instruction to the control circuit of the storage device, the instruction causing the control circuit to
perform a first operation, the first operation including
supplying a first program voltage to the first word line, and
supplying a first select voltage to the first select gate line,
perform a second operation after the first operation, the second operation including
supplying a second program voltage to the first word line, and
supplying a second select voltage to the second select gate line,
perform a third operation after the second operation, the third operation including
supplying a third program voltage to the second word line, and
supplying a third select voltage to the first select gate line, and
perform a fourth operation after the third operation, the fourth operation including
supplying a fourth program voltage to the second word line, and
supplying a fourth select voltage to the second select gate line.
8. The storage system according to claim 7 , wherein
the first select transistor, the first memory cell and the second memory cell of the first memory string are electrically connected in series, and
the second select transistor, the third memory cell and the fourth memory cell of the second memory string are electrically connected in series.
9. The storage system according to claim 7 , wherein
the second operation is performed immediately after the first operation, and
the fourth operation is performed immediately after the third operation.
10. The storage system according to claim 7 , wherein
in the first operation, first data is written in the first memory cell,
in the second operation, second data is written in the third memory cell,
in the third operation, third data is written in the second memory cell, and
in the fourth operation, fourth data is written in the fourth memory cell.
11. The storage system according to claim 7 , wherein
the first operation further includes
supplying a first transfer voltage to the second word line,
the second operation further includes
supplying a second transfer voltage to the second word line,
the third operation further includes
supplying a third transfer voltage to the first word line, and
the fourth operation further includes
supplying a fourth transfer voltage to the first word line.
12. The storage system according to claim 11 , wherein
the first to fourth program voltages are substantially the same,
the first to fourth select voltages are substantially the same, and
the first to fourth transfer voltages are substantially the same.
13. A method for operating a storage device,
the storage device including:
a first memory string including
a first select transistor,
a first memory cell, and
a second memory cell;
a second memory string including
a second select transistor,
a third memory cell, and
a fourth memory cell;
a bit line electrically connected to the first memory string and the second memory string;
a first select gate line electrically connected to a gate of the first select transistor;
a second select gate line electrically connected to a gate of the second select transistor;
a first word line electrically connected to a gate of the first memory cell and a gate of the third memory cell; and
a second word line electrically connected to a gate of the second memory cell and a gate of the fourth memory cell,
the method comprising:
performing a first operation, the first operation including
supplying a first program voltage to the first word line, and
supplying a first select voltage to the first select gate line;
performing a second operation after the first operation, the second operation including
supplying a second program voltage to the first word line, and
supplying a second select voltage to the second select gate line;
performing a third operation after the second operation, the third operation including
supplying a third program voltage to the second word line, and
supplying a third select voltage to the first select gate line; and
performing a fourth operation after the third operation, the fourth operation including
supplying a fourth program voltage to the second word line, and
supplying a fourth select voltage to the second select gate line.
14. The method according to claim 13 , wherein
the first select transistor, the first memory cell and the second memory cell of the first memory string are electrically connected in series, and
the second select transistor, the third memory cell and the fourth memory cell of the second memory string are electrically connected in series.
15. The method according to claim 13 , wherein
the second operation is performed immediately after the first operation, and
the fourth operation is performed immediately after the third operation.
16. The method according to claim 13 , wherein
in the first operation, first data is written in the first memory cell,
in the second operation, second data is written in the third memory cell,
in the third operation, third data is written in the second memory cell, and
in the fourth operation, fourth data is written in the fourth memory cell.
17. The method according to claim 13 , wherein
the first operation further includes
supplying a first transfer voltage to the second word line,
the second operation further includes
supplying a second transfer voltage to the second word line,
the third operation further includes
supplying a third transfer voltage to the first word line, and
the fourth operation further includes
supplying a fourth transfer voltage to the first word line.
18. The method according to claim 17 , wherein
the first to fourth program voltages are substantially the same,
the first to fourth select voltages are substantially the same, and
the first to fourth transfer voltages are substantially the same.