WO2005045373A1 - メモリ装置、メモリ制御方法および表示装置 - Google Patents
メモリ装置、メモリ制御方法および表示装置 Download PDFInfo
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- WO2005045373A1 WO2005045373A1 PCT/JP2004/010860 JP2004010860W WO2005045373A1 WO 2005045373 A1 WO2005045373 A1 WO 2005045373A1 JP 2004010860 W JP2004010860 W JP 2004010860W WO 2005045373 A1 WO2005045373 A1 WO 2005045373A1
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- Prior art keywords
- memory
- error
- cell
- test
- address
- Prior art date
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- 230000015654 memory Effects 0.000 title claims abstract description 89
- 238000000034 method Methods 0.000 title claims description 13
- 238000012360 testing method Methods 0.000 claims abstract description 61
- 238000001514 detection method Methods 0.000 claims description 7
- 238000012937 correction Methods 0.000 abstract description 24
- 238000010586 diagram Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 239000000470 constituent Substances 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 102220248506 rs104894625 Human genes 0.000 description 1
- 102220209086 rs1057520682 Human genes 0.000 description 1
- 102220075807 rs202025584 Human genes 0.000 description 1
- 102200092684 rs371769427 Human genes 0.000 description 1
- 102200158393 rs5030732 Human genes 0.000 description 1
- 102220082690 rs863224215 Human genes 0.000 description 1
- 102220289911 rs963277918 Human genes 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/08—Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing
- G11C29/12—Built-in arrangements for testing, e.g. built-in self testing [BIST] or interconnection details
- G11C29/44—Indication or identification of errors, e.g. for repair
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/70—Masking faults in memories by using spares or by reconfiguring
- G11C29/76—Masking faults in memories by using spares or by reconfiguring using address translation or modifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C29/00—Checking stores for correct operation ; Subsequent repair; Testing stores during standby or offline operation
- G11C29/04—Detection or location of defective memory elements, e.g. cell constructio details, timing of test signals
- G11C29/08—Functional testing, e.g. testing during refresh, power-on self testing [POST] or distributed testing
- G11C29/12—Built-in arrangements for testing, e.g. built-in self testing [BIST] or interconnection details
- G11C2029/1208—Error catch memory
Definitions
- Memory device Memory device, memory control method, and display device
- the present invention relates to a memory device and related technology, and more particularly, to a memory device having a built-in test function, a control method thereof, and a display device equipped with the memory device.
- Patent Literature 1 discloses a technology that uses a parity check and performs error correction in a redundant memory before an uncorrectable situation occurs.
- Patent Document 1 JP-A-10-49448
- the present invention has been made in view of these problems, and an object of the present invention is to provide a memory device suitable for large capacity and related technology.
- a memory device includes a memory block in which a memory cell is arranged; A test circuit for executing a self-test for the memory cell, a substitute cell for replacing a memory cell having an error as a result of the self-test, and a bypass circuit for switching access to the memory cell having the error to access to the substitute cell.
- This memory device may be a one-chip LSI. In that case, the LSI may be dedicated to the memory, or may include the memory and any system circuit or control circuit that uses the memory.
- the alternative cell may be configured by a register circuit provided outside the memory block. Since it is sufficient to provide, for example, several substitute cells for the memory block, the redundancy can be reduced as compared with the parity method which requires a redundant bit for each predetermined bit length.
- the bypass circuit includes an error address storage circuit that stores an address of the memory cell in which the error has occurred, and an address currently being accessed and the error address storage circuit.
- a comparison circuit that compares the stored address; and a switching circuit that changes an access destination to the alternative cell when both addresses compared by the comparison circuit match.
- Another embodiment of the present invention is a display device, comprising: a display memory; and a control circuit that reads data from the display memory and displays the data.
- the display memory includes a memory in which memory cells are arranged. A block, a test circuit for performing a self-test on the memory cell, a substitute cell for substituting a memory cell having an error as a result of the self-test, and an access to the substitute cell for the memory cell having the error And a bypass circuit that switches to. Since the display memory immediately informs the user that there is an error cell even with one bit, it is effective to replace the error cell with the display memory of this mode.
- Still another embodiment of the present invention relates to a memory control method, wherein a self-test is performed on a memory cell in the memory device according to a predetermined test start condition before using the memory device.
- a self-test is performed on a memory cell in the memory device according to a predetermined test start condition before using the memory device.
- a step of activating a substitute cell in place of the memory cell in which the error is detected; and when an access to the memory cell in which the error is detected occurs, To the alternative cell.
- the memory device of the present invention is suitable for increasing the capacity. Also, the error cell can be used as a normal cell by the substitute cell. In other aspects of the invention, the advantages of this memory device can be enjoyed.
- FIG. 1 is a diagram showing a configuration of a memory device according to an embodiment.
- FIG. 2 is a diagram showing a correspondence relationship between a first alternative cell path, a second alternative cell path, and an internal structure of a memory block.
- FIG. 3 is a diagram showing an internal configuration of a test circuit.
- FIG. 4 is a diagram showing an internal configuration of a first address comparator.
- FIG. 5 is a diagram showing an internal configuration of a register selector.
- FIG. 6 is a flowchart showing a BIST processing procedure in the embodiment.
- FIG. 7 is a flowchart showing a normal operation procedure after BIST in the embodiment.
- FIG. 1 shows a configuration of a memory device 100 according to the embodiment.
- the entity that reads and writes data from and to the memory device 100 is hereinafter referred to as a “processor”.
- a processor The entity that reads and writes data from and to the memory device 100 is hereinafter referred to as a “processor”.
- the memory device 100 or the memory device 100 and the processor are implemented as one integrated circuit device, that is, an LSI.
- "WD” is write data
- WE is a command signal indicating write when high, and read when low
- A is an address
- RD is a generic term for read data. Notation.
- the memory block 10 is an SRAM including a large number of memory cells or any other RAM. Tess
- the write circuit 12 is a circuit for so-called BIST (Built In Self Test), and the write selector 14 switches a path for writing test data to the memory block 10 by the test circuit 12 and a normal write access path. Normal write access is performed by the processor using the write bus 24.
- Write bus 24 propagates WD, A, and WE.
- the write memory bus 30 connects the write selector 14 and the memory block 10 and propagates WD, A, and WE. WD, A, and WE for test are input from the test circuit 12 to the write selector 14, and a test signal 36 indicating that the test is being performed is also input.
- test signal 36 When the test signal 36 is active, WD, A, and WE output from the test circuit 12 are input to the memory block 10 via the write selector 14. On the other hand, when the test signal 36 is inactive, write data from the processor is input to the memory block 10 via the write selector 14.
- the read selector 16 selects one of the read data from the memory block 10 and the later-described alternative data, and returns it to the processor via the read bus 26.
- the first error address register 21 and the second error address register 22 store a memory address (hereinafter simply referred to as “error address”) at which an error is detected as a result of the BIST performed by the test circuit 12.
- error address a memory address
- the test circuit 12 asserts an error detection signal 38, and this signal becomes a write trigger.
- the two systems of the first error address register 21 and the second error address register 22 are provided, as will be described later, by dividing the memory block 10 into a plurality of areas, and the first error address register 21 includes the first area and the second error This is because the address register 22 is in charge of each of the second areas.
- the test circuit 12 asserts the error detection signal 38 for the first error address register 21 and the error detection signal 38 for the second error address register 22.
- Signal 38 should be negated.
- the error address stored in first error address register 21 is output to first address comparator 31.
- the first address comparator 31 monitors the address of the memory block 10 when the processor accesses the memory block 10. When the address matches an error address, the first address comparator 31 reads “error memory cell (hereinafter simply referred to as error cell). Assert the first error cell access signal 61 indicating "access has occurred".
- the enable register 18 inhibits or permits the operation of the first address comparator 31 itself. When operation is prohibited, the first error Re-access signal 61 is not asserted.
- the first write logic circuit 41 is a logic circuit, and inputs WE, WD, and a first error cell access signal 61.
- the first write logic circuit 41 has a built-in latch or buffer circuit (not shown) as required for timing, but of course, it may be a through circuit.
- a through circuit is used for simplicity of explanation.
- the register selector 20 refers to the first error cell access signal 61 and the second error cell access signal 62 to determine which correction register data to select.
- the OR gate 34 outputs a high level when the first error cell access signal 61 or the second error cell access signal 62 is asserted, whereby the read selector 16 selects the output of the register selector 20 and reads it. Output to bus 26.
- FIG. 2 shows a first alternative cell path formed by a first error address register 21, a first address comparator 31, a first write logic circuit 41, a first correction register 51, a second error address register 22, The correspondence relationship between the second alternative cell path formed by the second address comparator 32, the second write logic circuit 42, the second correction register 52, and the internal structure of the memory block 10 is shown.
- These alternative cell circuits may be considered as “bypass circuits” because they bypass access to the memory block 10 for error recovery.
- the first and second alternative cell paths correspond to the first and second regions, ie, the first RAM 10a and the second RAM 10b.
- Memory block 10 may have multiple individual RAMs inside, in which case it is necessary to prepare alternate cells for each RAM. it can.
- Providing alternative cells for individual RAMs has the advantage, for example, that individual RAMs can have alternative cells and related circuits located close to and in place. If the size of each individual RAM is different, you can decide the number of alternative cells according to the size. For example, two alternative cells may be provided in 8 KB of RAM and four alternative cells in 16 KB of RAM. This is because the number of error cells is considered to be proportional to the size of the RAM. In Fig. 2, there are three or more RAMs, and Fig. 1 shows two of them.
- FIG. 3 shows an internal configuration of the test circuit 12.
- the state management unit 102 controls the operation of the entire test circuit 12 and asserts the test signal 36 during the test.
- the state is initialized by the reset input RST and advanced by the clock input CLK.
- the address generation unit 104, the data generation unit 106, and the command generation unit 108 respectively generate necessary addresses, test data, write and read commands for each state under the control of the state management unit 102.
- the address generator 104 has a built-in counter (not shown) that can be incremented and decremented for an address march test.
- Converter 110 compares the read value of the test data with the expected value, and if they do not match, asserts error detection signal 38 as detecting an error address.
- the error counter 112 counts the number of error detections, and notifies the state management unit 102 when the count value exceeds the number of prepared alternative cells.
- the state management unit 102 receives the notification and forcibly ends the test.
- the error counter 112 is configured as a system register so that the count value can be read from the processor, and the processor can know the number of errors and the presence or absence of forced termination due to errors as a result of the test.
- the test by the test circuit 12 can be performed according to the following states, for example.
- FIG. 4 shows an internal configuration of the first address comparator 31.
- the size of the RAM is 118 kilobytes, and that the input address is 10 13 bits.
- the comparator 120 compares the address A output from the processor with the error address stored in the first error address register 21. However, if a valid error address has not been written to the first error address register 21, the most significant bit MSB of the first error address register 21 should be set to an ⁇ error presence / absence flag '' to avoid accidental coincidence of both addresses.
- the first error address register 21 is configured so that the MSB becomes zero after reset. When the test circuit 12 detects an error, it writes 1 to the MSB and simultaneously writes the error address. As a result, the MSB becomes 1 only when the error address stored in the first error address register 21 is valid.
- the output of the enable register 18 and the MSB are input to the AND gate 122, and the comparator 120 is enabled by the output. I do. Only when the comparator 120 is enabled, the first error cell access signal 61 is asserted if both input addresses match.
- FIG. 5 shows an internal configuration of the register selector 20.
- the register selector 20 has a first selector 130 and a second selector 132, and is controlled by a first AND gate 136 and a second AND gate 138, respectively.
- the WE and the first error cell access signal 61 and the WE and the second error cell access signal 62 are input to the first AND gate 136 and the second AND gate 138, respectively.
- the first AND gate 136 outputs a high signal when WE is low and the first error cell access signal 61 is high, that is, when reading the error address assigned to the first correction register 51. And the data from the first correction register 51 labeled as “1” of the second selector 132 Is output.
- the second AND gate 138 outputs a high signal when WE is low and the second error cell access signal 62 is high, that is, when the error address assigned to the second correction register 52 is read, the output goes high.
- the data of the second correction register 52 which is labeled as "1" of the selector 130, is output.
- the latch 134 holds the output of the second selector 132, and the output is input to the side of the first selector 130 labeled "0".
- the data recorded by the latch 134 is output to the first selector 130 and the second selector 130. Loops through selector 132 and latch 134 and continues to be maintained. As described above, with the configuration of the register selector 20, data is properly selected from necessary substitute cells and output to the read selector 16.
- Figure 6 shows the BIST processing procedure.
- the power is supplied to the memory device 100, and the memory device 100 is reset by a hardware or software method (S10).
- the state management unit 102 of the test circuit 12 starts state control, and BIST starts (S12). Since the test signal 36 is asserted during BIST, the write selector 14 selects the test circuit 12 side.
- the test circuit 12 outputs the data to the WD, A, and WE S memory blocks 10.
- the read data of the memory block 10 is input to the comparator 110 of the test circuit 12 to check for an error.
- Figure 7 shows the normal operation procedure. Since BIST has been completed, the test circuit 12 does not operate, and the write selector 14 Bus 24 side is selected. As long as there is no access from the processor (S30N), the memory device 100 is in a standby state.
- the first address comparator 31 and the second address comparator 32 determine whether the address being accessed is an error address (S32). If it is not an error address, it returns to the standby state (S32N). If it is an error address, the first error cell access signal 61 or the second error cell access signal 62 is asserted and the output is selected and output to the read bus 26, and the read operation is performed. Prepare for.
- the first write logic circuit 41 monitors WE, and if the access to the error address is a write access (S34Y), writes WD to the first correction register 51 or the second correction register 52, which is a substitute cell (S3). 6).
- the test time is short. Also, there is no need to put a load on the processor, and there is no need to run a test program.
- the memory device 100 or the memory device 100 and the processor are mounted as one integrated circuit device.
- this naturally has a degree of freedom, and the arbitrary configuration shown in FIG. 1 can be put in an LSI or mounted externally.
- the entity that uses the memory block 10 is simply “processor”.
- This processor may be, for example, a CPU (central processing unit) of a display device or another control device.
- an application using the memory device 100 as a display memory is considered. If there is an error cell in the display memory, for example, a dot dropout occurs when displayed on an LCD, so that the user tends to recognize it as “defective”. If the memory device 100 according to the embodiment is used as the display memory, the error cell can be repaired, so that not only the failure of the display memory can be avoided, but also the failure of the LCD and the display device itself can be avoided. The effect is great.
- the substitute cell circuit is considered as a “bypass circuit”.
- bypass circuit only the first correction register 51 and the second correction register 52, and only the first address comparator 31 and the second address comparator 32, and furthermore, those and the first error register Only the address register 21 and the second error address register 22 may be considered.
- the present invention can be used for a memory device. Further, it can be used for a display device using the same.
Landscapes
- For Increasing The Reliability Of Semiconductor Memories (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
- Static Random-Access Memory (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/146,339 US7286422B2 (en) | 2003-11-06 | 2005-06-06 | Memory device with built-in test function and method for controlling the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003377503A JP3889391B2 (ja) | 2003-11-06 | 2003-11-06 | メモリ装置および表示装置 |
JP2003-377503 | 2003-11-06 |
Related Child Applications (1)
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US11/146,339 Continuation US7286422B2 (en) | 2003-11-06 | 2005-06-06 | Memory device with built-in test function and method for controlling the same |
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WO2005045373A1 true WO2005045373A1 (ja) | 2005-05-19 |
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PCT/JP2004/010860 WO2005045373A1 (ja) | 2003-11-06 | 2004-07-29 | メモリ装置、メモリ制御方法および表示装置 |
Country Status (5)
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US (1) | US7286422B2 (ja) |
JP (1) | JP3889391B2 (ja) |
CN (1) | CN100437527C (ja) |
TW (1) | TW200523947A (ja) |
WO (1) | WO2005045373A1 (ja) |
Families Citing this family (12)
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JP4979060B2 (ja) * | 2006-03-03 | 2012-07-18 | ルネサスエレクトロニクス株式会社 | 表示制御用半導体集積回路 |
US20070294588A1 (en) * | 2006-05-09 | 2007-12-20 | Coulson Richard L | Performing a diagnostic on a block of memory associated with a correctable read error |
JP5065618B2 (ja) * | 2006-05-16 | 2012-11-07 | 株式会社日立製作所 | メモリモジュール |
JP2008262630A (ja) * | 2007-04-11 | 2008-10-30 | Matsushita Electric Ind Co Ltd | 半導体集積回路及びメモリ検査方法 |
JP2008299962A (ja) * | 2007-05-31 | 2008-12-11 | Oki Electric Ind Co Ltd | 半導体記憶装置 |
US8006166B2 (en) * | 2007-06-12 | 2011-08-23 | Micron Technology, Inc. | Programming error correction code into a solid state memory device with varying bits per cell |
JP5251142B2 (ja) * | 2008-01-25 | 2013-07-31 | 富士通株式会社 | 転送装置、転送装置の制御方法及び情報処理装置 |
CN102681930B (zh) * | 2012-05-15 | 2016-08-17 | 浪潮电子信息产业股份有限公司 | 一种芯片级错误记录方法 |
US10127101B2 (en) * | 2015-08-28 | 2018-11-13 | Intel Corporation | Memory device error check and scrub mode and error transparency |
KR102633091B1 (ko) * | 2016-09-19 | 2024-02-06 | 삼성전자주식회사 | 메모리 셀의 에러 확인 기능을 갖는 메모리 장치 및 이를 포함하는 메모리 모듈 |
JP6841698B2 (ja) * | 2017-03-21 | 2021-03-10 | ルネサスエレクトロニクス株式会社 | 半導体装置 |
CN111951876B (zh) * | 2019-05-15 | 2022-06-03 | 上海磁宇信息科技有限公司 | 具有写检测功能和动态冗余的mram芯片及其数据读写方法 |
Citations (2)
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JP2001266589A (ja) * | 2000-03-21 | 2001-09-28 | Toshiba Corp | 半導体記憶装置およびそのテスト方法 |
JP2001352038A (ja) * | 2000-06-06 | 2001-12-21 | Matsushita Electric Ind Co Ltd | 半導体集積回路装置 |
Family Cites Families (7)
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US5265055A (en) * | 1988-10-07 | 1993-11-23 | Hitachi, Ltd. | Semiconductor memory having redundancy circuit |
JPH08152867A (ja) * | 1994-11-30 | 1996-06-11 | Toshiba Corp | 表示制御装置及び表示制御方法 |
US5631868A (en) * | 1995-11-28 | 1997-05-20 | International Business Machines Corporation | Method and apparatus for testing redundant word and bit lines in a memory array |
JP3068009B2 (ja) | 1996-08-06 | 2000-07-24 | 日本電気株式会社 | 冗長化メモリのエラー訂正機構 |
DE10026993B4 (de) | 1999-06-03 | 2014-04-03 | Samsung Electronics Co., Ltd. | Flash-Speicherbauelement mit einer neuen Redundanzansteuerschaltung |
JP2002319298A (ja) * | 2001-02-14 | 2002-10-31 | Mitsubishi Electric Corp | 半導体集積回路装置 |
JP2002032996A (ja) | 2001-06-04 | 2002-01-31 | Hitachi Ltd | マイクロコンピュータシステム |
-
2003
- 2003-11-06 JP JP2003377503A patent/JP3889391B2/ja not_active Expired - Fee Related
-
2004
- 2004-07-29 CN CNB2004800017469A patent/CN100437527C/zh not_active Expired - Fee Related
- 2004-07-29 WO PCT/JP2004/010860 patent/WO2005045373A1/ja active Application Filing
- 2004-10-11 TW TW093130711A patent/TW200523947A/zh unknown
-
2005
- 2005-06-06 US US11/146,339 patent/US7286422B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001266589A (ja) * | 2000-03-21 | 2001-09-28 | Toshiba Corp | 半導体記憶装置およびそのテスト方法 |
JP2001352038A (ja) * | 2000-06-06 | 2001-12-21 | Matsushita Electric Ind Co Ltd | 半導体集積回路装置 |
Also Published As
Publication number | Publication date |
---|---|
CN100437527C (zh) | 2008-11-26 |
TW200523947A (en) | 2005-07-16 |
JP2005141505A (ja) | 2005-06-02 |
CN1723449A (zh) | 2006-01-18 |
JP3889391B2 (ja) | 2007-03-07 |
US7286422B2 (en) | 2007-10-23 |
US20050219886A1 (en) | 2005-10-06 |
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