NONVOLATILE MEMORY SYSTEM, AND DATA READ/WRITE METHOD FOR NONVOLATILE MEMORY SYSTEM

• US 20080028131A1
• Filed: 12/15/2006
• Published: 01/31/2008
• Est. Priority Date: 07/31/2006
• Status: Active Grant

• Current Assignee: Kioxia Corporation
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Sukegawa, Hiroshi, Kawamoto, Kazuya, Kudo, Yasuo
• Granted Patent: US 7,711,889 B2
• Time in Patent Office: Days
• US Class Current: 711/103
• CPC Class Codes: G11C 16/10 Programming or data input circuits

Abstract

A nonvolatile memory system comprises a nonvolatile memory having a plurality of data areas; and a memory controller operative to control read and write operations to the nonvolatile memory. The memory controller successively executes read/write operations to plural sectors within a selected data area in the nonvolatile memory in accordance with a command and a sector count and sector address fed from a host device.

Claims

1. A nonvolatile memory system, comprising:

a nonvolatile memory having a plurality of data areas; and

a memory controller operative to control read and write operations to the nonvolatile memory,

wherein the memory controller successively executes read/write operations to plural sectors within a selected data area in the nonvolatile memory in accordance with a command and a sector count and sector address fed from a host device.

2. The nonvolatile memory system according to claim 1, wherein as the plurality of data areas, a first application program area having a capacity capable of being increased/decreased in accordance with the input of a capacity change command, a second application program area having a capacity to be decreased or increased in response to an increase or decrease in capacity of the first application program area, and a boot data record area for a host system are provided.

3. The nonvolatile memory system according to claim 2, wherein the first application program area is a program area for vender applications, and the second application program area is a program area for end user applications.

4. The nonvolatile memory system according to claim 1, wherein the nonvolatile memory comprises a memory cell array in which a plurality of NAND cell units with a plurality of electrically-rewritable nonvolatile memory cells serially connected are arrayed, a bit line is connected to one end of the NAND cell unit via a selection gate transistor, and a common source line is connected to the other end of the NAND cell unit via a selection transistor.

5. The nonvolatile memory system according to claim 4, wherein the memory controller performs write control in the boot data record area such that write to a cell adjacent to the selection gate transistor is not performed.

6. The nonvolatile memory system according to claim 4, wherein the memory controller performs write control in the boot data record area such that write is executed only to one of odd pages and even pages of the memory cell array.

7. The nonvolatile memory system according to claim 4, wherein the nonvolatile memory cell array is configured to store data of multivalue bit per nonvolatile memory cell, and the memory controller performs write control in the boot data record area such that 1 bit data storing is performed per nonvolatile memory cell.

8. The nonvolatile memory system according to claim 1, wherein the memory controller comprises:

a first interface performing data transfer with the nonvolatile memory;

a second interface performing data transfer with the host devices;

a data resistor temporarily holding data transferred by the first and second interfaces; and

a processing unit controlling data transfer via the first and second interfaces.

9. The nonvolatile memory system according to claim 2, wherein the first and second application program areas have read/write data transfer units, which can be set changeable with a selection of sector multiples.

10. The nonvolatile memory system according to claim 1, wherein as the plurality of data areas, a first application program area having a capacity to be increased/decreased in accordance with the input of a capacity change command, a second application program area having a capacity to be decreased or increased in response to an increase or decrease in capacity of the first application program area, a boot data record area for a host system, and a system data record area for the memory controller are provided.

11. The nonvolatile memory system according to claim 10, wherein data is automatically read from the boot data record area and the system data record area into the memory controller at the time of power-on, and then a read command is input to set a read mode in which the boot data is read into the host device.

12. The nonvolatile memory system according to claim 10, wherein the first and second application program areas have read/write data transfer units, which can be set changeable with a selection of sector multiples.

13. A data read/write method for nonvolatile memory system comprising a nonvolatile memory having a plurality of data areas and a memory controller operative to control read and write operations to the nonvolatile memory,

the method comprising:

providing a command, a sector count and sector address from a host device; and

successively executing read/write to plural sectors within a selected data area in the nonvolatile memory in accordance with a command and a sector count and sector address under a control of the memory controller.

14. The data read/write method for nonvolatile memory system according to claim 13, wherein as the plurality of data areas, a first application program area having a capacity capable of being increased/decreased in accordance with the input of a capacity change command, a second application program area having a capacity to be decreased or increased in response to an increase or decrease in capacity of the first application program area, and a boot data record area for a host system are provided.

15. The data read/write method for nonvolatile memory system according to claim 13, wherein the first and second application program areas have read/write data transfer units, which can be set changeable with a selection of sector multiples.

16. The data read/write method for nonvolatile memory system according to claim 13, wherein as the plurality of data areas, a first application program area having a capacity to be increased/decreased in accordance with the input of a capacity change command, a second application program area having a capacity to be decreased or increased in response to an increase or decrease in capacity of the first application program area, a boot data record area for a host system, and a system data record area for the memory controller are provided.