WO2005038655A1 - 半導体メモリ装置及びコントローラ並びにその読み書き制御方法 - Google Patents
半導体メモリ装置及びコントローラ並びにその読み書き制御方法 Download PDFInfo
- Publication number
- WO2005038655A1 WO2005038655A1 PCT/JP2004/015463 JP2004015463W WO2005038655A1 WO 2005038655 A1 WO2005038655 A1 WO 2005038655A1 JP 2004015463 W JP2004015463 W JP 2004015463W WO 2005038655 A1 WO2005038655 A1 WO 2005038655A1
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- WIPO (PCT)
- Prior art keywords
- memory
- half area
- nonvolatile
- configuration
- logical
- Prior art date
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/06—Addressing a physical block of locations, e.g. base addressing, module addressing, memory dedication
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2212/00—Indexing scheme relating to accessing, addressing or allocation within memory systems or architectures
- G06F2212/20—Employing a main memory using a specific memory technology
- G06F2212/202—Non-volatile memory
- G06F2212/2022—Flash memory
Definitions
- the present invention relates to a semiconductor memory device, a controller, and a read / write control method therefor.
- the present invention relates to a semiconductor memory device using a nonvolatile memory (flash memory) as a semiconductor memory, a controller, and a read / write control method thereof.
- flash memory nonvolatile memory
- memory cards such as an SD memory card (registered trademark) and a compact flash (registered trademark) have a feature of small size. Taking advantage of these features, memory cards have been put to practical use as removable memory devices for portable devices such as digital still cameras.
- a practical memory card has a built-in nonvolatile memory (flash memory) and a controller LSI as its control circuit.
- flash memory flash memory
- controller LSI controller LSI
- An object of the present invention is to provide a controller LSI (hereinafter simply referred to as a controller) that can be controlled by the same processing even if the number of built-in nonvolatile memories is changed.
- the present invention is to increase the versatility of the controller and, as a result, to reduce the price of the semiconductor memory device. Specifically, it is based on controlling two (two in total) nonvolatile memories (flash memories) via two buses. The goal is to simplify the controller's address management process and implement a controller that can control one (two in total) non-volatile memory in each of the two paths. Disclosure of the invention
- a controller for a semiconductor memory device and a nonvolatile memory performs read / write control on a plurality of nonvolatile memories via first and second memory buses in response to a read / write instruction from a host device.
- the case where the nonvolatile memory UFO is connected to the first memory path and the nonvolatile memory F1 is connected to the second memory path is called a two-memory configuration.
- a case where two nonvolatile memories F0 and F2 are connected to the first memory bus and two nonvolatile memories F1 and F3 are connected to the second memory bus is called a four-memory configuration.
- the present invention enables such two types of memory configurations to be selected.
- a continuous logical address specified by the host device is sent to the controller as a logical sequential number for each predetermined size.
- a sequential number conversion means for conversion is provided, and a modulo number generation unit is provided for generating a logical sequential modulo number forming a modulo number of 4, which repeats a value from 0 to 3 for a logical sequential number.
- FIG. 1 is a block diagram showing an overall configuration of a semiconductor memory device including a controller according to an embodiment of the present invention.
- FIG. 2 is a configuration diagram of F0 when the flash memory used in the semiconductor memory device is connected to four flash memories.
- FIG. 3 is a configuration diagram of F0 when the flash memory used in the semiconductor memory device is connected to two flash memories.
- FIG. 4 is a conceptual diagram showing a configuration of a block in the semiconductor memory device.
- FIG. 5 is a conceptual diagram showing a structural example of a logical address format in the semiconductor memory device.
- FIG. 6 is a conceptual diagram showing a write sequence of the semiconductor memory device.
- BEST MODE FOR CARRYING OUT THE INVENTION a semiconductor memory device and a controller thereof according to an embodiment of the present invention will be described with reference to the drawings.
- FIG. 1 is a block diagram showing the configuration of the semiconductor memory device according to the present embodiment.
- the semiconductor memory device has a controller 102 and a plurality of flash memories 103 to 106.
- the flash memories 103, 104, 105, and 106 may be described as 0, F1, F2, and F3, respectively.
- the controller 102 converts a continuous logical address sequence transferred in response to a data write instruction or a read instruction from the host device 101 from a logical address to a physical address, and also controls the four flash memories 1. Data is written to or read from 03, 104, 105, 106 or two flash memories 103, 104. Note that although the flash memories 105 and 106 are shown by broken lines, this means that the nonvolatile memory is excluded when it has a two-flash memory configuration.
- the flash memories 103, 104, 105, and 106 are independently selected by the chip enable signals CE0, CE1, CE2, and CE3, respectively.
- the controller 102 and the flash memories 103 to 107 are connected using two memory paths, and the memory paths of the bus number 0 are connected to the flash memories 103 and 105.
- the flash memories 104 and 106 are connected to the memory bus of pass number 1.
- the controller 102 controls the operation of writing and reading data to and from the non-volatile memory. Functionally, the selection unit 102 a and the sequential number conversion unit (SN conversion unit) 1 0 b, a modulo-numper generation unit (MN generation unit) 102 c, and a read / write control unit (W / R control unit) 102 d.
- SN conversion unit sequential number conversion unit
- MN generation unit modulo-numper generation unit
- W / R control unit read / write control unit
- the selection unit 102a determines whether the flash memory has a two-memory configuration or a four-memory configuration, and selects either one. Specifically, in the initialization process immediately after power-on, the selection unit 102 a It is implemented by checking whether each terminal for sending the chip enable signal CE 0, CE 1, CE 2, CE 3 in the roller 102 is connected to the flash memory, that is, whether it is open or not. Determine the number of flash memories available.
- the SN converter 102b converts a logical address specified by the host device 101 into a logical sequential number for each predetermined size.
- the MN generation unit 102c generates a logical sequential modulo numper that forms a remainder system of 4 that repeats a value from 0 to 3 for one logical sequential numper.
- Control unit 102 (1 means that when a write instruction to the continuous logical address is issued from the host device 101, F0, F Writing is performed in a format in which l, F2, and F3 are cyclically repeated selectively. In the case of a two-memory configuration, the first half area of F0, the first half area of F1, the second half area of F0, and the second half of F1 In addition, the writing is performed in such a manner that the half area is selectively and repeatedly traversed, and the / 1 control unit 10201 reads out the data requested to be accessed according to the memory configuration.
- the controller 102 specifically includes a microcomputer, a RAM, and the like, and is configured by peripheral devices, software, and the like.
- FIG. 2 and 3 show the internal configuration of one flash memory.
- 201 shown in FIG. 2 is a schematic diagram of the flash memory 103 in a 4-flash memory configuration.
- reference numeral 202 shown in FIG. 3 is a schematic diagram of the flash memory 103 in a two-flash memory configuration.
- the other flash memories that is, the flash memories 104, 105, and 106 have the same configuration as the flash memory 103 in the case of a 4-flash memory configuration.
- the flash memory 104 has the same configuration as the flash memory 103.
- the flash memory in the 4-memory configuration is controlled by being divided into two areas, that is, unit numbers 0 and 1.
- the flash memory in the two-memory configuration is controlled by being divided into two virtual flash memories, that is, memories F00 and F01.
- Each flash memory is divided into a plurality of blocks (BL) and handled as shown in the figure.
- FIG. 4 is an internal configuration diagram of a block which is an erasing unit, which corresponds to each block (BL) shown in FIGS. 2 and 3.
- the unit of data writing is one page (2 KB).
- Each page consists of 4 sectors, that is, 0 to 3 sectors.
- Each sector has a capacity of 512 B.
- One block consists of 128 pages (pages 0 to 127). For simplicity of explanation, the management area of each sector and each page is omitted.
- FIG. 5 is an explanatory diagram showing a logical address format.
- the logical address format includes a 1-bit unit No, a predetermined number of logical block numbers, a 7-bit page number, a 1-bit pair number, a 1-bit path number, A 2-bit sector has one No.
- Sector-1 No is a bit for selecting one of sectors 10 to 3 shown in FIG.
- the path number is a bit that selects one of the two memory paths as shown in FIG.
- the pair NO is a bit that selects a combination of flash memories.
- a pair of the first half area of the flash memories 103 and 104 F00 and F10 shown in Fig. 1
- the second half area of the flash memories 103 and 104 Fig. 1 F 0 1 and F 11 1 shown in the figure.
- the flash memory 103 and 104 groups in a 4-memory configuration.
- the first half area (F00, F10) of the flash memories 103 and 104 is accessed.
- the group of flash memories 105 and 106 is accessed in a 4-memory configuration.
- access is made to the groups of the latter half area (F01, F11) of the flash memories 103 and 104.
- the page number is the total number of pages per block shown in Fig. 4 (128 ⁇ This is a pit for selecting one of the pages.
- the logical block number is a half area of each flash memory, that is, the unit No.O or unit No. 201 in FIG. 2 and the logical block No. per F00 or F01 in 202 in FIG. Yes, consisting of a predetermined number of bits.
- This logical block number is converted into a physical block No by the logical-physical conversion table in the controller 102, and the block is selected.
- the logical-physical conversion table is a table used when converting a logical address to a physical address based on a predetermined rule.
- Unit No. is a bit used in the case of a four-memory configuration, and selects the first and second half of the flash memory as shown in FIG.
- any of the four flash memories 103 to 106 can be specified by the two bits of the pair N 0 and the path No. , F01, F10, and F11 can be specified.
- Fig. 6 shows which flash memory (or area) data is written in response to a continuous logical address string (hereinafter referred to as logical sequential number) transferred in response to a data write command from the host device 101.
- logical sequential number a continuous logical address string
- a logical sequential No. (LS No.) is transferred from the host device 101 to the controller 102 together with a data write instruction.
- the logical sequential No. is in numerical order every 2 KB (corresponding to the page size which is a writing unit), and this number is the increment of the bit of the path No. in the logical address format shown in Fig. 5. Is incremented as follows.
- the controller 102 writes data to each flash memory while incrementing the page position starting from this bit position.
- This logical sequential N 0 is converted to a coset system of 4 taking a value from 0 to 3 as shown in (2) of FIG. 6, or only the lower 2 bits are taken out, and the logical sequential modulo N 0 ( Used for selection of flash memory as LSM No). That is, the pair No and the bus No are set so that 4 is 0, 5 is 1, and 0, 1, 2, 3, or 0 0, 0 1, 10, 0, 1 in the case of 2-bit representation. Will be incremented.
- the flash memory 103 is represented by F0, 104 by Fl, 105 by F2, and 106 by F3.
- the pair number is 0 when the flash memories are F0 and F1, so the write order is F0, F0 as shown in (3) in FIG. It will be repeated in a cycle of Fl, F2, and F3.
- the fan N 0 has a value of 0 when the first half area F 0 0 of the flash memory F 0 and the first half area F 1 0 of the flash memory F 1. As shown in (4) of FIG. 6, the repetition is performed in such a manner as to go around F00, F10, F01, and F11. Note that the start of writing may be from F0 or other than F00.
- the flash memory is divided into two approximately equal logical areas, and the same address processing is performed simply by changing the definition of the pair number. That is, using the logical address format shown in Fig. 5, the 4-flash memory configuration and the 2-flash memory Write address management of the configuration can be performed.
- the logical address range is divided into two for the entire area of one flash memory.
- the logical address range is divided into eight areas of areas 0 to 7, and the first half area 0 to 3 and the second half area are divided.
- the regions 4 to 7 may be grouped such that the pair No is 0 and 1, respectively.
- the controller of the present invention can realize the function of a semiconductor memory device having an arbitrary capacity by adding a nonvolatile memory to a memory module having a plurality of built-in chips.
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Read Only Memory (AREA)
- Memory System (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005514835A JPWO2005038655A1 (ja) | 2003-10-17 | 2004-10-13 | 半導体メモリ装置及びコントローラ並びにその読み書き制御方法 |
US10/553,974 US7203105B2 (en) | 2003-10-17 | 2004-10-13 | Semiconductor memory device, controller, and read/write control method thereof |
US11/712,387 US7633817B2 (en) | 2003-10-17 | 2007-03-01 | Semiconductor memory device, controller, and read/write control method thereof |
Applications Claiming Priority (2)
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JP2003357694 | 2003-10-17 | ||
JP2003-357694 | 2003-10-17 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/712,387 Continuation US7633817B2 (en) | 2003-10-17 | 2007-03-01 | Semiconductor memory device, controller, and read/write control method thereof |
Publications (1)
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WO2005038655A1 true WO2005038655A1 (ja) | 2005-04-28 |
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PCT/JP2004/015463 WO2005038655A1 (ja) | 2003-10-17 | 2004-10-13 | 半導体メモリ装置及びコントローラ並びにその読み書き制御方法 |
Country Status (5)
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US (2) | US7203105B2 (ja) |
JP (1) | JPWO2005038655A1 (ja) |
CN (2) | CN101286137A (ja) |
TW (1) | TW200515147A (ja) |
WO (1) | WO2005038655A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006331408A (ja) * | 2005-05-24 | 2006-12-07 | Samsung Electronics Co Ltd | 読み出し性能を向上させることができるメモリカード |
JP2016033818A (ja) * | 2014-07-30 | 2016-03-10 | ▲ホア▼▲ウェイ▼技術有限公司 | データ処理方法、装置、およびシステム |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100433195C (zh) * | 2003-12-31 | 2008-11-12 | 深圳市朗科科技股份有限公司 | 闪存介质数据写入方法 |
US7848144B2 (en) * | 2008-06-16 | 2010-12-07 | Sandisk Corporation | Reverse order page writing in flash memories |
US8745439B2 (en) * | 2009-04-17 | 2014-06-03 | Lsi Corporation | Systems and methods for multilevel media defect detection |
US9026714B2 (en) * | 2010-06-04 | 2015-05-05 | Cisco Technology, Inc. | Memory expansion using rank aggregation |
JP2012014416A (ja) * | 2010-06-30 | 2012-01-19 | Toshiba Corp | 記録装置、書き込み装置、読み出し装置、及び記録装置の制御方法 |
US8589360B2 (en) * | 2011-12-12 | 2013-11-19 | Hewlett-Packard Development Company, L.P. | Verifying consistency levels |
KR102012740B1 (ko) * | 2012-07-18 | 2019-08-21 | 삼성전자주식회사 | 복수의 불휘발성 메모리 칩들을 포함하는 저장 장치 및 그것의 제어 방법 |
KR102002921B1 (ko) | 2012-12-05 | 2019-07-23 | 삼성전자주식회사 | 버퍼 운영 방법 및 그에 따른 반도체 저장 장치 |
WO2015047266A1 (en) * | 2013-09-26 | 2015-04-02 | Intel Corporation | Block storage apertures to persistent memory |
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JPH0520181A (ja) * | 1991-07-10 | 1993-01-29 | Fujitsu Ltd | 主記憶制御装置 |
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CN1136503C (zh) * | 1996-01-30 | 2004-01-28 | Tdk株式会社 | 闪烁存储系统 |
US6167486A (en) * | 1996-11-18 | 2000-12-26 | Nec Electronics, Inc. | Parallel access virtual channel memory system with cacheable channels |
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CN1173272C (zh) * | 2000-09-12 | 2004-10-27 | 财团法人资讯工业策进会 | 多重可变地址映射电路 |
JP4418439B2 (ja) * | 2006-03-07 | 2010-02-17 | パナソニック株式会社 | 不揮発性記憶装置およびそのデータ書込み方法 |
-
2004
- 2004-10-12 TW TW093130872A patent/TW200515147A/zh unknown
- 2004-10-13 JP JP2005514835A patent/JPWO2005038655A1/ja active Pending
- 2004-10-13 US US10/553,974 patent/US7203105B2/en active Active
- 2004-10-13 CN CNA2008100835617A patent/CN101286137A/zh active Pending
- 2004-10-13 WO PCT/JP2004/015463 patent/WO2005038655A1/ja active Application Filing
- 2004-10-13 CN CNB2004800086064A patent/CN100422955C/zh active Active
-
2007
- 2007-03-01 US US11/712,387 patent/US7633817B2/en not_active Expired - Fee Related
Patent Citations (4)
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JPS4866745A (ja) * | 1971-12-16 | 1973-09-12 | ||
JPH0520181A (ja) * | 1991-07-10 | 1993-01-29 | Fujitsu Ltd | 主記憶制御装置 |
JPH07295880A (ja) * | 1994-04-27 | 1995-11-10 | Toshiba Corp | インタリーブ方式を適用する記憶装置 |
JPH10187359A (ja) * | 1996-12-26 | 1998-07-14 | Toshiba Corp | データ記憶システム及び同システムに適用するデータ転送方法 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2006331408A (ja) * | 2005-05-24 | 2006-12-07 | Samsung Electronics Co Ltd | 読み出し性能を向上させることができるメモリカード |
JP2016033818A (ja) * | 2014-07-30 | 2016-03-10 | ▲ホア▼▲ウェイ▼技術有限公司 | データ処理方法、装置、およびシステム |
US9727253B2 (en) | 2014-07-30 | 2017-08-08 | Huawei Technologies, Co., Ltd. | Data processing method, apparatus, and system |
Also Published As
Publication number | Publication date |
---|---|
US7633817B2 (en) | 2009-12-15 |
JPWO2005038655A1 (ja) | 2007-01-18 |
TWI365376B (ja) | 2012-06-01 |
CN1768331A (zh) | 2006-05-03 |
CN100422955C (zh) | 2008-10-01 |
US7203105B2 (en) | 2007-04-10 |
CN101286137A (zh) | 2008-10-15 |
US20070156948A1 (en) | 2007-07-05 |
US20060190670A1 (en) | 2006-08-24 |
TW200515147A (en) | 2005-05-01 |
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