WO2006038249A1 - 半導体装置及びその制御方法 - Google Patents
半導体装置及びその制御方法 Download PDFInfo
- Publication number
- WO2006038249A1 WO2006038249A1 PCT/JP2004/014326 JP2004014326W WO2006038249A1 WO 2006038249 A1 WO2006038249 A1 WO 2006038249A1 JP 2004014326 W JP2004014326 W JP 2004014326W WO 2006038249 A1 WO2006038249 A1 WO 2006038249A1
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- WO
- WIPO (PCT)
- Prior art keywords
- semiconductor device
- read
- ground
- write
- bank
- 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
- G11C16/28—Sensing or reading circuits; Data output circuits using differential sensing or reference cells, e.g. dummy cells
-
- 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
-
- 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
- G11C16/34—Determination of programming status, e.g. threshold voltage, overprogramming or underprogramming, retention
- G11C16/3436—Arrangements for verifying correct programming or erasure
-
- 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
- G11C16/34—Determination of programming status, e.g. threshold voltage, overprogramming or underprogramming, retention
- G11C16/3436—Arrangements for verifying correct programming or erasure
- G11C16/3454—Arrangements for verifying correct programming or for detecting overprogrammed cells
- G11C16/3459—Circuits or methods to verify correct programming of nonvolatile memory cells
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C2216/00—Indexing scheme relating to G11C16/00 and subgroups, for features not directly covered by these groups
- G11C2216/12—Reading and writing aspects of erasable programmable read-only memories
- G11C2216/22—Nonvolatile memory in which reading can be carried out from one memory bank or array whilst a word or sector in another bank or array is being erased or programmed simultaneously
Definitions
- the present invention relates to a semiconductor device, and more particularly to a technique that enables a high-speed operation and a sufficient operation margin of a semiconductor memory having a dual operation function.
- flash memory has rapidly spread as a semiconductor storage device that can be electrically rewritten, and stores NAND type and programs used for data storage such as memory cards to store electronic devices. It is classified into the NOR type built in In a typical NOR flash memory, data (“1” or “0”) is stored depending on whether or not the charge is accumulated in the floating gate.
- the unit cell of such a NOR flash memory consists of a single MOS transistor, and has a control gate (upper gate) and a floating gate (lower gate)!
- a positive bias for example, 5V
- a bias of about IV is applied to the drain from the sense amplifier.
- the bias applied to the control gate is canceled by the charge accumulated in the floating gate, and the memory cell does not flow the cell current (non-conducting) and reads data “0”.
- the bias applied to the control gate does not cancel out, so the memory cell passes a cell current (conduction) and reads data "1”.
- the sense amplifier reads these cell currents and outputs data “0” or “1” as a voltage. At this time, the cell current I when the data is "1" and the cell current I when the data is "0"
- the margin can be expanded.
- FIG. 1 is a block diagram for explaining the configuration of a sense amplifier.
- a selected memory cell 1 la is connected to a sense amplifier 13a via a decoder 12a.
- the reference cell l ib is connected to the sense amplifier 13b via the decoder 12b, and the memory cell 11a is connected to the reference cell l ib by sensing.
- 14a and 14b, 15a and 15b, and 16a and 16b are a source switch, parasitic resistance, and ground (GND) connected to the memory cell 11a and the reference cell l ib, respectively.
- a parasitic resistance 15a due to wiring or the like exists between the memory cell 11a and the GND 16a.
- the potential of the source switch 14a connected to the memory cell 11a ie, the source potential
- V is the gate-source voltage
- V is the t ds gs as rain-source voltage
- V is the threshold voltage
- the read operation by the processor cannot be executed while the write operation or the erase operation is in progress, and the flash memory status register is periodically changed before the read operation to the flash memory is started.
- the end of a write or erase operation must be polled to detect the end of a write or erase operation.
- a dual operation function has been introduced that allows other data to be read while programming or erasing (rewriting) the data.
- FIG. 2 is a block diagram for explaining an internal configuration example of a conventional flash memory having a dual operation function that enables the above-described simultaneous operation.
- the memory cell array is divided into several banks (four in FIG. 2), and one bank can rewrite the data and read data from other banks during a certain period. thing It is.
- This memory cell array 200 includes four banks of memory cells of No. 0 node 201, No. 1 node 202, No. 2 node 203, and No. 3 bank 204, and address reading provided in each bank.
- Read address switch and write address switch (ARO—AR3 and AWO—AW3) for (AR) and address write (AW), and read data switch and write data for data read (DR) and data write (DW)
- a data read sense amplifier block having a source switch SO-S3, a data read sense amplifier 207a and an output circuit 207b and connected to the read reference 205.
- a data write sense amplifier block 208 connected to a write reference 206 having a lock 207, a write sense amplifier 208a, a write circuit 208b, and an erase circuit 208c, and an address terminal 211 connected to four banks Possible address buffer 209, data read sense amplifier block 207, data write sense amplifier block 208, controller 210 connected to address buffer 209, output circuit 207b provided in data read sense amplifier block 207, and An IZO terminal 213 connected to the write circuit 208b provided in the data write sense amplifier block 208.
- this memory cell array 200 is a read that reads data from each bank 201-204 in order to realize a dual operation function that allows other data to be read while programming or erasing (rewriting) data.
- Either a circuit for writing or a circuit for writing to rewrite data can be connected, and the circuit for reading is connected only to the bank that performs reading, while the circuit for writing is connected only to the bank that performs writing. The As a result, the read operation during the write operation can be executed simultaneously.
- the write operation includes a verify operation for verifying whether writing or erasing has been performed to a predetermined level, which is essentially the same as the read operation.
- Force that may be generated even when a read operation is performed during a verify operation In a configuration commonly used for read and write, more current flows through the ground wiring than when only one of read and verify is running, and voltage drop due to parasitic resistance also increases. As a result, the source potential force of each memory cell selected for reading or writing only increases either when reading or verifying is in progress, leading to a decrease in cell current. As a result, as described above, the read speed and the margin of the read and verify operations are reduced.
- the present invention eliminates the above-mentioned inconveniences of a conventional flash memory having a dual operation function, and enables a high-speed operation and a sufficient operation margin regardless of the power failure of dual operation.
- the purpose is to provide the following technologies.
- the present invention provides a semiconductor device that can operate simultaneously in the first and second operation modes, and includes an internal portion of the semiconductor device in the first operation mode.
- a semiconductor device in which a first ground wiring for grounding a circuit and a second ground wiring for grounding the internal circuit in a second operation mode are provided independently.
- This semiconductor device can be configured to have a first ground terminal connected to the first ground wiring and a second ground terminal connected to the second ground wiring. .
- the first ground wiring and the second ground wiring may be substantially equal in length!
- the semiconductor device may include a switch that selectively connects the internal circuit and the first and second ground wirings.
- the internal circuit has a plurality of banks, and the first and first banks
- the second ground wiring may be provided in common for the plurality of banks.
- the internal circuit includes a plurality of banks, and the semiconductor device includes a switch that selectively connects the plurality of banks to the first and second ground wirings. can do.
- each of the plurality of banks may include a plurality of nonvolatile memory cells.
- the first and second modes may be a data read mode and a write mode, respectively.
- the internal circuit includes a plurality of banks having a plurality of memory cells, and a first bank that is one of the plurality of banks operates in the first mode, The second bank operates in the second mode, the first bank is connected to the first ground wiring, and the second bank is connected to the second ground wiring. it can.
- the first and second operation modes may be a data reading mode and a writing mode, respectively.
- the semiconductor device is, for example, a nonvolatile semiconductor memory device.
- the present invention is also a method for controlling a semiconductor device capable of operating simultaneously in the first and second operation modes, wherein the internal circuit of the semiconductor device is connected via the first ground wiring in the first operation mode. And grounding the internal circuit via a second ground wiring provided independently of the first ground wiring in the second operation mode.
- the read ground and the verify write ground are provided independently, the source potential of the memory cell is read or verified even if the read and verify operations are performed simultaneously. It becomes possible to equalize the potential when only one of the refinements is being executed, and a stable read operation is realized at a high speed and by increasing the margin regardless of whether the operation is a dual operation.
- FIG. 1 is a block diagram for explaining a configuration of a sense amplifier.
- FIG. 2 is a block diagram for explaining an internal configuration example of a conventional flash memory having a dual operation function that enables simultaneous operation.
- FIG. 3 is a block diagram for explaining an internal configuration example of a flash memory according to the present invention.
- FIG. 4 (a) and (b) show the case where the read operation is executed in the first bank when the second bank is in the write operation in the flash memory having the configuration shown in FIG. 2 and FIG. It is a figure for demonstrating the state of each switch.
- FIG. 5 (a) and (b) are diagrams showing the state of the source potential when the second bank is caused to execute a read operation when the third bank is in a write operation.
- the semiconductor memory device is assumed to be a NOR type flash memory.
- FIG. 3 is a block diagram for explaining an example of the internal configuration of the flash memory of the present invention.
- a read ground 312a and a verify write ground 312b are provided independently. . This enables the source potential of the memory cell to be equal to the potential when only one of read or verify is being executed even if read and verify operations are performed simultaneously. Regardless, high-speed and stable read operation with increased margin is realized.
- a memory cell array 300 is provided in four banks of memory cells of No. 0 301, No. 1 302, No. 2 303, and No. 3 304 and in each bank.
- Read address switch and write address switch (AR0—AR3 and AW0—AW3) for read address (AR) and address write (AW), and read for data read (DR) and data write (DW)
- Data switch and write data switch (DR0 to DR3 and DW0—DW3), read source switch SR0—SR3 connected to each of the above four banks and connected to read ground terminal 312a, corresponding to each bank
- a write source switch SW0—SW3 connected to the write ground terminal 312b, a data read sense amplifier 307a, and an output circuit 307b.
- a data read sense amplifier block 307 connected to the reference 306, a data read sense amplifier block 307, a data write sense amplifier 308a, a write circuit 308b, and an erase circuit 308c. It has four address terminals 311 Address buffer 309 connectable to the bank, data read sense amplifier block 307, data write sense amplifier block 308, controller 310 connected to address buffer 309, and output circuit provided in data read sense amplifier block 307 And an IZO terminal 313 connected to the write circuit 308b provided in the sense amplifier block 308 and the path 307b.
- the cell array is divided into banks (301-304), and a decoder circuit (not shown) is provided in each bank. Even in this configuration, the read operation is not different from the conventional structure when it is not in the write state.
- the external force is also input to the address terminal 311 and the address buffer 309 outputs this signal as a read address.
- the controller 310 operates the switch group so that the read address is transmitted only to the selected bank. In the bank selected by the read address, the memory cell corresponding to the address is selected by the decoder.
- the controller 310 operates the switch group so as to connect only the selected bank to the sense amplifier 307a of the read circuit.
- the data in the memory cell is determined by the sense amplifier 307a, and the result is output to the IZO terminal 313 via the output circuit 307b to execute the read operation.
- the ground wiring 320 through which the cell current flows is connected to the read ground terminal 312a, and no current flows through the write ground terminal 312b.
- a ground wiring 322 through which a cell current flows is connected to the write ground terminal 312b.
- the ground wirings 320 and 322 are provided in common to the banks 301 to 304, respectively.
- the ground wiring 320 is connected to a read ground terminal 312a, and the ground wiring 322 is provided with a write ground terminal 312b.
- the ground wirings 320 and 322 may have different lengths, but are preferably substantially the same length.
- the read ground terminal 312a and the write ground terminal 312b may constitute independent external connection terminals, or may be connected to form a single external connection terminal. In the latter case, the lead and write switches are arranged as close as possible to the common external connection terminal.
- the read and write operations can be defined as the first and second operation modes, respectively.
- the controller 310 writes to the address buffer 309.
- the switch group is operated so that the write address is transmitted only to the selected bank.
- the switch group is operated so as to connect the sense amplifier 308a, the write circuit 308b, and the erase circuit 308c of the write circuit as necessary.
- the selected bank rewrites the data in the memory cell corresponding to the designated address.
- the address read during the verify operation is input to the address terminal 311 from the outside.
- the controller 310 operates the address buffer 309 and the switch group so that this address is transmitted only to the bank for which the read is selected as a read address independent of the verify address.
- the memory cell corresponding to the read-selected bank selects the corresponding memory cell and connects to the sense amplifier 307a, determines the data, and then transfers the data to the IZO terminal. Output to 313.
- the cell current in the read operation and the cell current in the verify operation flow through the read ground terminal 312a and the write ground terminal 312b, respectively, but these two currents pass through independent paths.
- the current value is the same as the current value in the case of only the read operation or the write operation, respectively, and the current value does not increase in the dual operation unlike the conventional configuration.
- FIG. 4 (a) shows each of the cases where the first bank 302 is caused to execute a read operation when the second No. 303 power is being written in the flash memory of the present invention having the configuration shown in FIG. It is a figure for demonstrating the state of a switch. It is clear that the operation at the time of dual operation by any combination of other banks can be executed in the same way as the example described below by setting the switch to be turned on and off as the corresponding switch of each bank. is there. For comparison, in the flash memory having the conventional configuration shown in FIG. 2, the state of each switch when the read operation is executed by the first bank 202 when the second bank 203 is in the write operation. This is shown in Fig. 4 (b).
- Figures 5 (a) and 5 (b) show the case where the read operation is executed in the first bank while the second bank is in the write operation (that is, in Fig. 4 (a) and The state of the source potential in Fig. 4 (b) corresponding to the switch state is shown.
- the write address switch AW2 and the write data switch DW2 of the second bank 303 during the write operation are turned on, and are electrically connected to the address buffer 309 and the write reference 306. Is done. Also, turn on the light source switch SW2. As a result, the second bank 303 is connected to the write ground 312b.
- the read address switch AR1 and the read data switch DR1 of the first bank 302 that executes the read operation are turned on, and are electrically connected to the address buffer 309 and the read reference 305. Further, when the read source switch SR1 is turned on, the first bank 302 is connected to the read ground 312a. All other switches are off.
- the controller 310 operates the switch group as shown in FIG. 4 (a) so that only the first bank 302 is transmitted.
- the controller 310 operates the switch group so as to connect only the selected first bank 302 to the sense amplifier 307a of the read circuit.
- the data in the memory cell is determined by the sense amplifier 307a, and the result is output to the IZO terminal 313 via the output circuit 307b to execute the read operation.
- the ground wiring 320 through which the cell current flows is connected to the read ground terminal 312a, and no current flows through the write ground terminal 312b.
- the controller 310 outputs the write address to the address buffer 309, and only the selected second bank 303 has the write address.
- the switch group is operated so that is transmitted.
- the switch group is operated so as to connect the sense amplifier 308a, the write circuit 308b, and the erase circuit 308c of the write circuit as necessary.
- the selected second bank 303 rewrites the data in the memory cell according to the specified address.
- the address to be read during the verify operation is input from the outside to the address terminal 311.
- the controller 310 operates the address buffer 309 and the switch group so as to transmit only this address to the first bank 302 selected to be read as a read address independent of the verify address. After that, as in the case of only the read operation described above, the read-selected first bank 302 selects the corresponding memory cell, connects to the sense amplifier 307a, determines the data, and then transfers the data to the IZO Output to terminal 313. At this time, the cell current in the read operation and the cell current in the verify operation flow through the read ground terminal 312a and the write ground terminal 312b, respectively.
- the current value is the same as that in the case of only the read operation or the write operation, and the current value does not increase in the dual operation.
- the read ground 312a and the verify write ground 312b are provided independently. Therefore, as shown in FIG. Even if the eye operation is performed at the same time, the source potential of the memory cell can be made equal to the potential when only one of the read and verify operations is being performed. Stable read operation is realized by increasing the margin.
- the present invention provides a technique that enables a high-speed operation and a sufficient operation margin of a semiconductor device having a dual operation function.
- the present invention includes not only a semiconductor memory device such as a flash memory but also a semiconductor device such as a system LSI having a memory portion with the above-described configuration.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006539081A JP4642030B2 (ja) | 2004-09-30 | 2004-09-30 | 半導体装置及びその制御方法 |
PCT/JP2004/014326 WO2006038249A1 (ja) | 2004-09-30 | 2004-09-30 | 半導体装置及びその制御方法 |
US11/228,976 US7307893B2 (en) | 2004-09-30 | 2005-09-16 | Semiconductor device and method for controlling the same |
Applications Claiming Priority (1)
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PCT/JP2004/014326 WO2006038249A1 (ja) | 2004-09-30 | 2004-09-30 | 半導体装置及びその制御方法 |
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US11/228,976 Continuation US7307893B2 (en) | 2004-09-30 | 2005-09-16 | Semiconductor device and method for controlling the same |
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WO2006038249A1 true WO2006038249A1 (ja) | 2006-04-13 |
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JP (1) | JP4642030B2 (ja) |
WO (1) | WO2006038249A1 (ja) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH03148827A (ja) * | 1989-11-06 | 1991-06-25 | Nec Ic Microcomput Syst Ltd | 半導体集積回路 |
JP2000207891A (ja) * | 1999-01-11 | 2000-07-28 | Toshiba Corp | 半導体記憶装置 |
JP2003123493A (ja) * | 2001-10-12 | 2003-04-25 | Fujitsu Ltd | ソース電位を制御してプログラム動作を最適化した不揮発性メモリ |
JP2004039184A (ja) * | 2002-07-08 | 2004-02-05 | Fujitsu Ltd | 半導体記憶装置 |
Family Cites Families (10)
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NL296214A (ja) * | 1961-02-15 | |||
US4999812A (en) * | 1988-11-23 | 1991-03-12 | National Semiconductor Corp. | Architecture for a flash erase EEPROM memory |
US5526305A (en) * | 1994-06-17 | 1996-06-11 | The United States Of America As Represented By The Secretary Of The Air Force | Two-transistor dynamic random-access memory cell |
KR0164814B1 (ko) * | 1995-01-23 | 1999-02-01 | 김광호 | 반도체 메모리장치의 전압 구동회로 |
US5757816A (en) * | 1996-10-24 | 1998-05-26 | Advanced Micro Devices, Inc. | IDDQ testing of integrated circuits |
US5973985A (en) * | 1998-08-11 | 1999-10-26 | Stmicroelectronics, Inc. | Dual port SRAM cell having pseudo ground line or pseudo power line |
US6181604B1 (en) * | 1999-07-22 | 2001-01-30 | Macronix International Co., Ltd. | Method for fast programming of EPROMS and multi-level flash EPROMS |
US6418046B1 (en) * | 2001-01-30 | 2002-07-09 | Motorola, Inc. | MRAM architecture and system |
JP2006183499A (ja) * | 2004-12-27 | 2006-07-13 | Hitachi Ltd | 容積形圧縮機 |
KR100802016B1 (ko) * | 2005-02-25 | 2008-02-12 | 삼성전자주식회사 | 용량가변 압축기 및 그 기동운전방법 |
-
2004
- 2004-09-30 WO PCT/JP2004/014326 patent/WO2006038249A1/ja active Application Filing
- 2004-09-30 JP JP2006539081A patent/JP4642030B2/ja active Active
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2005
- 2005-09-16 US US11/228,976 patent/US7307893B2/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03148827A (ja) * | 1989-11-06 | 1991-06-25 | Nec Ic Microcomput Syst Ltd | 半導体集積回路 |
JP2000207891A (ja) * | 1999-01-11 | 2000-07-28 | Toshiba Corp | 半導体記憶装置 |
JP2003123493A (ja) * | 2001-10-12 | 2003-04-25 | Fujitsu Ltd | ソース電位を制御してプログラム動作を最適化した不揮発性メモリ |
JP2004039184A (ja) * | 2002-07-08 | 2004-02-05 | Fujitsu Ltd | 半導体記憶装置 |
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Publication number | Publication date |
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JPWO2006038249A1 (ja) | 2008-05-15 |
US20060109711A1 (en) | 2006-05-25 |
US7307893B2 (en) | 2007-12-11 |
JP4642030B2 (ja) | 2011-03-02 |
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