MEMORY SYSTEM

• US 20140250277A1
• Filed: 05/28/2013
• Published: 09/04/2014
• Est. Priority Date: 03/04/2013
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Harasawa, Akinori, Aoyama, Yoshimasa
• Application Number:
  US13/903,111
• Publication Number:
  US 20140250277A1
• Time in Patent Office: Days
• US Class Current: 711/153
• CPC Class Codes: G06F 12/023 Free address space management
• CPC Class Codes: G06F 16/1858 Parallel file systems, i.e. file systems supporting multiple processors
• CPC Class Codes: G06F 16/188 Virtual file systems
• CPC Class Codes: G06F 2212/7205 Cleaning, compaction, garbage collection, erase control
• CPC Class Codes: G06F 3/0608 Saving storage space on storage systems
• CPC Class Codes: G06F 3/0644 Management of space entities, e.g. partitions, extents, pools
• CPC Class Codes: G06F 3/0688 Non-volatile semiconductor memory arrays

Abstract

According to one embodiment, a memory system comprises a storage areas each having a physical page that is data-write- and read-accessible, the storage areas being divided into a plurality of parallel operation elements capable of performing a parallel operation, and the physical pages of the storage areas being associated with a logical page, a storage unit having a first buffer configured to store data to be rewritten in the storage areas, and a control unit configured to perform data transfer between the storage areas and the storage unit. The control unit comprises a logical page management unit configured to divide the logical page in a predetermined number of parallel operation elements out of the plurality of parallel operation elements, and a system control unit configured to perform a predetermined operation in each of the divided logical pages.

Claims

1. A memory system comprising:

a storage areas each having a physical page that is data-write- and read-accessible, the storage areas being divided into a plurality of parallel operation elements capable of performing a parallel operation, and the physical pages of the storage areas being associated with a logical page;

a storage unit having a buffer configured to store data to be rewritten in the storage areas; and

a control unit configured to perform data transfer between the storage areas and the storage unit,

wherein the control unit comprises;

a logical page management unit configured to divide the logical page into a first logical page and a second logical page in a predetermined number of parallel operation elements out of the plurality of parallel operation elements and manage the logical pages;

a compaction control unit configured to generate a write command and a read command in compaction processing; and

a system control unit configured to perform a read operation in the compaction processing of the second logical page when performing a write operation in the compaction processing of the first logical page and perform the read operation in the compaction processing of the first logical page when performing the write operation in the compaction processing of the second logical page based on the write command and the read command in the compaction processing.

2. A memory system comprising:

a storage areas each having a physical page that is data-write- and read-accessible, the storage areas being divided into a plurality of parallel operation elements capable of performing a parallel operation, and the physical pages of the storage areas being associated with a logical page;

a storage unit having a buffer configured to store data to be rewritten in the storage areas; and

a control unit configured to perform data transfer between the storage areas and the storage unit,

wherein the control unit comprises;

a logical page management unit configured to divide the logical page in a predetermined number of parallel operation elements out of the plurality of parallel operation elements;

a compaction control unit configured to generate a write command and a read command in compaction processing; and

a system control unit configured to perform a write operation and a read operation in the compaction processing at least partially simultaneously in parallel between the divided logical pages based on the write command and the read command in the compaction processing.

3. A memory system comprising:

a storage areas each having a physical page that is data-write- and read-accessible, the storage areas being divided into a plurality of parallel operation elements capable of performing a parallel operation, and the physical pages of the storage areas being associated with a logical page;

a storage unit having a first buffer configured to store data to be rewritten in the storage areas; and

a control unit configured to perform data transfer between the storage areas and the storage unit,

wherein the control unit comprises;

a logical page management unit configured to divide the logical page in a predetermined number of parallel operation elements out of the plurality of parallel operation elements; and

a system control unit configured to perform a predetermined operation in each of the divided logical pages.

4. The system of claim 3, wherein the system control unit performs processing at least partially simultaneously in parallel between the divided logical pages.

5. The system of claim 3, wherein the control unit further comprises a compaction control unit configured to generate a write command and a read command in compaction processing.

6. The system of claim 5, wherein the system control unit performs a write operation and a read operation in the compaction processing in each of the divided logical pages based on the write command and the read command in the compaction processing.

7. The system of claim 6, wherein the logical page management unit divides the logical page into a first logical page and a second logical page in a predetermined number of parallel operation elements out of the plurality of parallel operation elements, and

the system control unit performs the read operation in the compaction processing of the second logical page when performing the write operation in the compaction processing of the first logical page and performs the read operation in the compaction processing of the first logical page when performing the write operation in the compaction processing of the second logical page.

8. The system of claim 7, wherein the system control unit starts the write operation in the compaction processing of the first logical page at an end of the read operation in the compaction processing of the first logical page, starts the read operation in the compaction processing of the second logical page after the start of the write operation in the compaction processing of the first logical page, and starts the write operation in the compaction processing of the second logical page at an end of the read operation in the compaction processing of the second logical page.

9. The system of claim 6, wherein the control unit further comprises a data buffer control unit configured to manage a free capacity of the first buffer.

10. The system of claim 9, wherein the system control unit performs the read operation in the compaction processing in accordance with acquisition of information of the free capacity of the first buffer.

11. The system of claim 6, further comprising a controller connected to each of the plurality of parallel operation elements and configured to perform interface processing between the plurality of parallel operation elements and the first buffer and the control unit.

12. The system of claim 6, wherein in the read operation in the compaction processing, compaction target data of the divided logical page is transferred from the storage areas to the first buffer, and in the write operation in the compaction processing, the compaction target data is transferred from the first buffer to the storage areas.

13. The system of claim 12, wherein in the write operation in the compaction processing, the compaction target data is transferred from the first buffer to registers of the storage areas, and the compaction target data is written from the registers to cell arrays of the storage areas.

14. The system of claim 12, wherein the read operation in the compaction processing is sequentially performed for one of the plurality of parallel operation elements.

15. The system of claim 12, wherein transfer of the compaction target data from the first buffer to the registers of the storage areas is sequentially performed for one of the plurality of parallel operation elements.

16. The system of claim 6, wherein a capacity of the first buffer is not less than that of the predetermined number of parallel operation elements and smaller than that of the plurality of parallel operation elements.

17. The system of claim 3, wherein the storage unit further comprises a second buffer configured to temporarily store data exchanged between a host and the storage areas.

18. The system of claim 17, wherein the system control unit performs a write operation and a read operation by the host in each of the divided logical pages based on a write command and a read command from the host.