WO2006103734A1 - 不揮発性半導体メモリおよびその読み出し方法並びにマイクロプロセッサ - Google Patents
不揮発性半導体メモリおよびその読み出し方法並びにマイクロプロセッサ Download PDFInfo
- Publication number
- WO2006103734A1 WO2006103734A1 PCT/JP2005/005748 JP2005005748W WO2006103734A1 WO 2006103734 A1 WO2006103734 A1 WO 2006103734A1 JP 2005005748 W JP2005005748 W JP 2005005748W WO 2006103734 A1 WO2006103734 A1 WO 2006103734A1
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- WO
- WIPO (PCT)
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- memory cells
- read
- nonvolatile memory
- nonvolatile
- memory cell
- Prior art date
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/06—Auxiliary circuits, e.g. for writing into memory
- G11C16/26—Sensing or reading circuits; Data output circuits
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
- G11C16/0466—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells with charge storage in an insulating layer, e.g. metal-nitride-oxide-silicon [MNOS], silicon-oxide-nitride-oxide-silicon [SONOS]
- G11C16/0475—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells with charge storage in an insulating layer, e.g. metal-nitride-oxide-silicon [MNOS], silicon-oxide-nitride-oxide-silicon [SONOS] comprising two or more independent storage sites which store independent data
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C16/00—Erasable programmable read-only memories
- G11C16/02—Erasable programmable read-only memories electrically programmable
- G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
- G11C16/0491—Virtual ground arrays
Definitions
- Nonvolatile semiconductor memory reading method thereof, and microprocessor
- the present invention relates to a nonvolatile semiconductor memory, a reading method thereof, and a microprocessor, and more particularly, a virtual ground type nonvolatile semiconductor memory capable of being electrically written and erased, a reading method thereof, and the nonvolatile semiconductor.
- the present invention relates to a microphone mouth processor equipped with a memory.
- FIG. 7 shows the structure of a conventional floating gate type virtual ground nonvolatile semiconductor memory.
- the figure is an example of an AND type.
- the floating gate type virtual ground nonvolatile semiconductor memory includes floating gate type nonvolatile memory cells (hereinafter referred to as memory cells) m 1, m 2,.
- bit lines BL, BL,... Constitute a memory cell array.
- the threshold value of the storage area of the memory cell is read and compared with a reference value, and the threshold value is higher or lower than the reference value. Convert.
- voltages V and V are applied to the word line and bit line corresponding to the selected address, respectively. For example, word line WL and bit line BL,
- bit line BL 5 24 2 Voltage V is applied and voltage V is applied to bit line BL. Also, the bit line BL and memory cell
- the adjacent bit line BL across WL 4 B and 4 m is connected to GND. As a result, the floating of the memory cell m
- the drain current I varies depending on the number of electrons stored in the free gate.
- the referrer The voltage V is applied to the word line WL of the lens cell m, the voltage V is applied to the bit line BL, and the opposite source line
- Read conversion circuit SA is the drain current I power of memory cell m ⁇
- Patent Document 1 Japanese Patent Laid-Open No. 7-57487 (paragraph numbers [0009] to [0011], FIG. 1) Disclosure of the Invention
- the floating gate type virtual ground nonvolatile semiconductor memory has a problem that it is difficult to increase the reading speed.
- the read conversion circuit SA force is based on the current difference between the drain current of the memory cell and the drain current of the reference cell.
- the read conversion circuit SA can make the determination.
- a reference cell for generation is indispensable, and a memory cell array area must be secured for this purpose.
- the present invention has been made in view of these points, and provides a nonvolatile semiconductor memory and a reading method thereof capable of improving the reading speed without increasing the memory cell array area. With the goal.
- a nonvolatile semiconductor memory includes a memory cell array 1 in which nonvolatile memory cells are arranged, a word line selection circuit 2 that forms a row selection circuit, a bit line selection circuit 3 that forms a column selection circuit, and read data. It has read conversion circuits 4a, 4b, and 4c to be generated.
- Each of the memory cell arrays 1 has two adjacent column lines (in the figure, bit lines BL, BL,...
- bit lines 1 2 and below (referred to as bit lines) and row lines (in the figure, word lines WL, WL,...
- non-volatile memory cells MC 1, MC 2,... Having two storage areas in one cell are arranged to form an array.
- the gate is connected to the word line, and the source / drain is connected to the bit line.
- the threshold value of the outer storage area of the two storage areas of the two nonvolatile memory cells that are symmetric with respect to the adjacent bit lines is preliminarily set in a pair relationship. Is set.
- the word line selection circuit 2 selects a word line connected to the two nonvolatile memory cells to be read and applies a predetermined read voltage.
- the bit line selection circuit 3 applies a ground voltage to the bit lines connected to the two non-volatile memory cells directly outside the bit lines connected to the two non-volatile memory cells to be read. A predetermined read voltage is applied to the line so that a current flows through the nonvolatile memory cell.
- the read conversion circuits 4a, 4b, and 4c compare the drain currents flowing through the two nonvolatile memory cells activated by the word line selection circuit 2 and the bit line selection circuit 3 and convert them into one data. Output.
- a nonvolatile memory having two storage areas in one cell.
- the threshold values of the outer storage areas of the two nonvolatile memory cells that are symmetrical with respect to the adjacent bit lines are set in a pair relationship. Keep it.
- the word line selection circuit 2 is connected to the two non-volatile memory cells to be read. A line is selected and a predetermined read voltage is applied, and the bit line selection circuit 3 selects a bit line directly connected to the nonvolatile memory cell, applies a ground voltage, and selects an inner bit line. Then, a predetermined read voltage is applied.
- the two nonvolatile memory cells to be read out are activated, and a drain current corresponding to the threshold value of the storage area outside each nonvolatile memory cell flows.
- the drain currents flowing through the two nonvolatile memory cells are compared and converted into one data and output.
- a nonvolatile memory cell having two storage areas in one cell Of the two storage areas of the two non-volatile memory cells that are symmetric with respect to adjacent column lines in the memory cell array formed with the gate connected to the row line and the source / drain connected to the column line, respectively.
- the threshold value of the outer storage area is set in a pair relationship with the adjacent column line, and the row selection circuit is configured to store the outer storage of the two nonvolatile memory cells to be read.
- a predetermined read voltage is applied to the row line to which the two nonvolatile memory cells are connected, and the column selection circuit force is directly outside the two nonvolatile memory cells to be read.
- a ground voltage is applied to the two column lines, a predetermined read voltage is applied to the two inner column lines, and a read conversion circuit is activated by the row selection circuit and the column selection circuit.
- the threshold value of the outer storage area of the non-volatile memory cell is in a pair relationship, so that the difference in drain current of each non-volatile memory cell is compared and converted into one data.
- a single cell is coupled to adjacent column lines in a memory cell array formed of nonvolatile memory cells each having two storage areas.
- the threshold values of the storage areas outside the two non-volatile memory cells that are symmetric are set to have a pair relationship.
- the row selection circuit selects a row line connected to the two target nonvolatile memories and applies a predetermined read voltage, and the column selection circuit directly connects the two target nonvolatile memories. Apply the ground voltage to the outer column line and the specified read voltage to the inner column line. This activates the two target non-volatile memories.
- the read conversion circuit compares the drain current flowing through each nonvolatile memory cell and converts it into one data.
- a virtual ground type memory cell array is configured by using nonvolatile memory cells each having two storage areas, and is symmetrical with respect to two adjacent column lines. Set the threshold of the storage area outside each volatile memory cell to be in a pair relationship.
- a ground voltage is applied to the column line directly outside the memory cell, a predetermined read voltage is applied to the inner column line, and the drain currents of the respective non-volatile memory cells in a pair relationship are compared. Since the data is converted into one data, a reference cell is not required, and the current does not flow outside the column line to which the ground voltage is applied, so that the reading speed can be improved. At this time, it is not necessary to increase the memory cell array area.
- FIG. 1 is a block diagram showing a configuration of a nonvolatile semiconductor memory according to an embodiment.
- FIG. 2 is a diagram showing a data read operation of the embodiment.
- FIG. 3 is a diagram showing a data read operation of another address in the embodiment.
- FIG. 4 is a diagram showing an initial state of the memory cell array according to the embodiment.
- FIG. 5 is a diagram showing a write circuit and a write operation of the embodiment.
- FIG. 6 is a configuration diagram of a microprocessor according to the embodiment.
- FIG. 7 is a diagram showing a structure of a conventional floating gate type virtual ground nonvolatile semiconductor memory. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a block diagram showing a configuration of the nonvolatile semiconductor memory according to the embodiment.
- nonvolatile memory cells having two storage areas are arranged in rows and columns, and each gate is connected to a word line (row line).
- a word line selection circuit 2 and a bit line selection circuit 3 that activates the two target memory cells by selecting the outermost bit line and the inner bit line connected to the two memory cells to be read.
- a virtual ground type configuration having read conversion circuits 4a, 4b, and 4c that compare the drain currents of two memory cells activated by the word line selection circuit 2 and the bit line selection circuit and convert them into one data
- memory cells MC 1, MC 2,... That are electrically writable and erasable and each have two storage areas are arranged in rows and columns. Column direction
- the drains and sources of adjacent memory cells are sequentially connected in series by a bit line.
- the gate of each memory cell is connected to one of the word lines arranged in the row direction.
- the memory cell MC has two storage areas M,
- the threshold value of the outer storage area is a pair, that is, one storage area. If the threshold value is high and the state is set, the other threshold value is set to low and the state.
- a memory cell MC and a memory that are symmetrical with respect to two adjacent bit lines BL and BL.
- 11 13 is set to be in a state where the threshold value of the storage area M of the memory cell MC is high.
- the threshold value of the storage area M, of the memory cell MC becomes low, and the storage area M
- the state where the threshold is high means a state where the amount of electrons stored in the storage area is large, and conversely, the state where the threshold is low means a state where the amount of electrons stored in the storage area is small. This If the high and low values are set so that the respective threshold values are in a pair relationship, when the threshold value is compared, the threshold value and the value of the storage area of the deviation are high. ! Easy comparison of status.
- Each memory cell arranged in the memory cell array 1 is preferably composed of a non-floating gate type memory cell.
- the word line selection circuit 2 Since the word line selection circuit 2 reads the storage area outside the two memory cells to be read whose threshold values are set so as to form a pair relationship, the word line selection circuit 2 corresponds to the memory address requested to be read. Select the word line connected to the two memory cells to be read and apply the specified read voltage.
- bit line selection circuit 3 Since the bit line selection circuit 3 reads the storage area outside the two memory cells to be read whose threshold values are set so as to form a pair relationship, the bit line selection circuit 3 corresponds to the memory address requested to be read. A ground voltage is applied to the bit lines directly connected to the two memory cells, and a predetermined read voltage is applied to the inner bit lines so that a current flows through the two selected memory cells. In addition, two bit lines to which a predetermined read voltage is applied are connected to the corresponding read conversion circuits 4a, 4b, 4c.
- a memory cell MC and a memory symmetric with respect to two adjacent bit lines BL and BL.
- the bit line selection circuit 2 applies a predetermined read voltage to the word line WL, and the bit line selection circuit.
- Memory cells MC and MC are activated and stored in storage areas M and M, respectively.
- the read conversion circuits 4a, 4b, and 4c are in accordance with the threshold value of the storage area outside the two memory cells activated by the word line selection circuit 2 and the bit line selection circuit 3.
- the drain current that flows is compared and converted to data.
- Data is output as predetermined bit data and its inverted bit data.
- the read conversion circuit 4a has the bit data DO
- inverted bit data is expressed by adding Z to the data name.
- the threshold values of the outer storage areas are respectively input via two bit lines connected to two memory cells that are set in a pair relationship. Since the drain currents of these memory cells are compared with each other, the reference cell becomes unnecessary. In addition, since the ground voltage is applied to the outermost bit line and a predetermined read voltage is applied to the inner bit line to V, no current flows outside the outer bit line, so data conversion is processed at high speed. be able to. Note that the read conversion circuits 4a, 4b, and 4c are configured by a differential amplifier or the like that detects the respective current differences.
- FIG. 2 is a diagram illustrating a data read operation according to the embodiment.
- black circles indicate a state with many electrons
- white circles indicate a state with few electrons.
- the circles indicated by dotted lines are not particularly relevant to the explanation, and are in either a state with many electrons or a state with few electrons.
- the read conversion circuits 4a, 4b, and 4c are differential amplifiers that compare two bit line force input drain currents and determine each signal value based on the current difference. Suppose that it consists of SA.
- the adjacent bit lines of the two storage areas of the two memory cells that are symmetric with respect to the adjacent bit lines are set so as to form a pair relationship.
- the threshold values of the storage areas outside the two outer memory cells that are symmetric with respect to adjacent bit lines are set in a pair relationship. For example, each of the memory cells MC and the memory cells MC that are symmetric with respect to adjacent bit lines BL and BL
- the threshold values of the storage areas M and M ′ are set to have a pair relationship.
- the other storage area of each memory cell is also set to have a threshold value relationship with the storage area outside the memory cell that is symmetrical with respect to another adjacent bit line. Is done.
- the other storage area M of the memory cell MC is connected to the bit lines BL and BL.
- a word line selection circuit selects a word line to which two memory cells corresponding to the designated address are connected, and a predetermined read voltage V is applied. Then, a designated line is selected by a bit line selection circuit (not shown).
- a ground voltage (hereinafter referred to as GND) is connected to the bit line directly outside the two memory cells corresponding to the address, and a predetermined read voltage V is applied to the inner bit line to which each memory cell is connected.
- GND ground voltage
- the drain current of the Mori cell is input to the differential amplifier SA via the two selected bit lines.
- Figure 2 shows the memory cell MC.
- Memory area M has a high threshold (black circle), memory area MC of memory cell MC, threshold
- the word line WL connected to the two memory cells MC and MC is selected by the word line selection circuit according to the designated address, and reading is performed.
- GND is applied to the external bit lines BL and BL connected to MC and MC.
- the read voltage V is applied to the bit lines BL and BL.
- the bit lines BL and BL are connected to the bit lines BL and BL.
- a corresponding drain current I flows.
- the threshold d2 22 22 of the storage area M of the memory cell MC is set high, and the threshold value of the storage area M ′ of the memory cell MC is set low.
- bitZ inverted output bit
- anti A configuration in which the output bit is omitted can also be adopted.
- the respective drain currents I and I are outside dl d2
- the reading speed can be improved.
- bit lines BL and BL are at the same potential V, a current flows through the memory cell MC.
- FIG. 3 is a diagram illustrating a data read operation of another address according to the embodiment.
- the same components as those in Fig. 2 are denoted by the same reference numerals.
- the threshold value of the other storage area M is the memory cell across the adjacent bit lines BL and BL.
- the storage area M of the memory cell MC is connected to the adjacent bit lines BL and BL.
- the procedure is the same as in FIG. 2, and the read voltage V is applied to the two memory cells MC to be read selected by the address and the word line WL to which the memory cells MC are connected.
- the read voltage V is applied to the inner bit lines BL and BL.
- bit lines BL and BL are connected to the differential amplifier SA. This
- a drain current I corresponding to the electron state of the storage area M flows through the memory cell MC, and the memory cell MC
- the drain current flowing in the differential amplifier SA is the drain current I flowing in the memory cell MC.
- the output bit is DO (bit) d3 26 d4 2 because the drain current I flowing in the memory cell MC is larger than the drain current I.
- FIG. 4 is a diagram illustrating an initial state of the memory cell array according to the embodiment.
- one of the two storage areas of each memory cell has a high threshold !, a lot of electrons !, a state (black circle), and the other has a threshold! /, Value. Is set to low (low!), Low electron content (white circle).
- memory cell MC one storage area M
- FIG. 5 is a diagram illustrating the write circuit and the write operation according to the embodiment.
- the bit line BL corresponding to the storage area M is also selected and written to the storage area M.
- P1 flows to M, and M transitions to a state with many electrons. This procedure is repeated for other memory cells.
- nonvolatile semiconductor memory described above is electrically rewritable and has high speed. Since it can be accessed, it is applied to storage devices in microprocessors.
- the nonvolatile semiconductor memory according to the present invention can also be applied to a memory device of a micro processor.
- FIG. 6 is a configuration diagram of the microprocessor according to the embodiment.
- the microprocessor 100 has a function of inputting an analog signal from an external device, executing a predetermined process, and outputting it, and is entirely controlled by a CPU (Central Processing Unit) 101.
- a random access memory (RAM) 102, a flash memory 103, an AZD converter 104, a DZA converter 105, and a communication interface (UART) 106 are connected to the CPU 101 via a bus 107.
- the RAM 102 temporarily stores at least part of an OS (Operating System) program and application programs to be executed by the CPU 101.
- the FLASH memory 103 is a nonvolatile semiconductor memory according to the present invention, and stores data that must be retained even when the power is turned off, such as a program and data required when the power is turned on.
- the AZD converter 104 converts an analog signal input from the outside into a digital signal
- the DZA converter 105 converts the digital signal into an analog signal and outputs it to the outside.
- the UART 106 outputs communication data to the outside
- the FLASH memory 103 applied to the embodiment having such a configuration has a storage area on one side of two memory cells in which threshold values are set so as to form a pair relationship simultaneously from two bit lines. Since these drain currents are read and compared, high-speed reading is possible. Further, since the memory area on one side of each of the two memory cells is used for reading, it can be configured with the same memory cell area size as when reading 1 bit per cell, and the memory cell array area does not increase. Furthermore, since no reference cell is required, the overall circuit area can be reduced. Because of these advantages, it is suitable for a memory device of a microprocessor. A microprocessor equipped with such a FLASH memory has a high processing speed as a result of high-speed reading from the FLA SH memory. You can do it.
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- Microelectronics & Electronic Packaging (AREA)
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Abstract
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2005/005748 WO2006103734A1 (ja) | 2005-03-28 | 2005-03-28 | 不揮発性半導体メモリおよびその読み出し方法並びにマイクロプロセッサ |
CN2005800492128A CN101147201B (zh) | 2005-03-28 | 2005-03-28 | 非易失性半导体存储器及其读出方法、以及微处理器 |
JP2007510263A JP4620728B2 (ja) | 2005-03-28 | 2005-03-28 | 不揮発性半導体メモリおよびその読み出し方法並びにマイクロプロセッサ |
US11/905,225 US7773425B2 (en) | 2005-03-28 | 2007-09-28 | Nonvolatile semiconductor memory, method for reading the same, and microprocessor |
Applications Claiming Priority (1)
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PCT/JP2005/005748 WO2006103734A1 (ja) | 2005-03-28 | 2005-03-28 | 不揮発性半導体メモリおよびその読み出し方法並びにマイクロプロセッサ |
Related Child Applications (1)
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US11/905,225 Continuation US7773425B2 (en) | 2005-03-28 | 2007-09-28 | Nonvolatile semiconductor memory, method for reading the same, and microprocessor |
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WO2006103734A1 true WO2006103734A1 (ja) | 2006-10-05 |
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US (1) | US7773425B2 (ja) |
JP (1) | JP4620728B2 (ja) |
CN (1) | CN101147201B (ja) |
WO (1) | WO2006103734A1 (ja) |
Families Citing this family (3)
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US9299455B2 (en) * | 2012-03-06 | 2016-03-29 | Hitachi, Ltd. | Semiconductor storage device having nonvolatile semiconductor memory |
US9390799B2 (en) * | 2012-04-30 | 2016-07-12 | Taiwan Semiconductor Manufacturing Company, Ltd. | Non-volatile memory cell devices and methods, having a storage cell with two sidewall bit cells |
US12033703B2 (en) * | 2021-10-09 | 2024-07-09 | Infineon Technologies LLC | Multibit memory device and method of operating the same |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0757487A (ja) * | 1993-08-13 | 1995-03-03 | Nec Corp | 仮想接地型半導体記憶装置 |
JP2003323796A (ja) * | 2002-04-29 | 2003-11-14 | Fujitsu Ltd | メモリ装置におけるプリチャージレベルを制御するシステム |
JP2004247436A (ja) * | 2003-02-12 | 2004-09-02 | Sharp Corp | 半導体記憶装置、表示装置及び携帯電子機器 |
Family Cites Families (6)
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CN1179363C (zh) * | 2001-07-26 | 2004-12-08 | 旺宏电子股份有限公司 | 具有对称型双信道的快擦写存储器的操作方法 |
US6700815B2 (en) * | 2002-04-08 | 2004-03-02 | Advanced Micro Devices, Inc. | Refresh scheme for dynamic page programming |
US6690602B1 (en) * | 2002-04-08 | 2004-02-10 | Advanced Micro Devices, Inc. | Algorithm dynamic reference programming |
US6643177B1 (en) * | 2003-01-21 | 2003-11-04 | Advanced Micro Devices, Inc. | Method for improving read margin in a flash memory device |
US7324374B2 (en) * | 2003-06-20 | 2008-01-29 | Spansion Llc | Memory with a core-based virtual ground and dynamic reference sensing scheme |
US7038948B2 (en) * | 2004-09-22 | 2006-05-02 | Spansion Llc | Read approach for multi-level virtual ground memory |
-
2005
- 2005-03-28 JP JP2007510263A patent/JP4620728B2/ja not_active Expired - Fee Related
- 2005-03-28 WO PCT/JP2005/005748 patent/WO2006103734A1/ja not_active Application Discontinuation
- 2005-03-28 CN CN2005800492128A patent/CN101147201B/zh not_active Expired - Fee Related
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2007
- 2007-09-28 US US11/905,225 patent/US7773425B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0757487A (ja) * | 1993-08-13 | 1995-03-03 | Nec Corp | 仮想接地型半導体記憶装置 |
JP2003323796A (ja) * | 2002-04-29 | 2003-11-14 | Fujitsu Ltd | メモリ装置におけるプリチャージレベルを制御するシステム |
JP2004247436A (ja) * | 2003-02-12 | 2004-09-02 | Sharp Corp | 半導体記憶装置、表示装置及び携帯電子機器 |
Also Published As
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JPWO2006103734A1 (ja) | 2008-09-04 |
JP4620728B2 (ja) | 2011-01-26 |
US20080037329A1 (en) | 2008-02-14 |
CN101147201A (zh) | 2008-03-19 |
CN101147201B (zh) | 2010-07-28 |
US7773425B2 (en) | 2010-08-10 |
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