WO2004109709A1 - 半導体記憶装置、および半導体記憶装置のビット線選択方法 - Google Patents
半導体記憶装置、および半導体記憶装置のビット線選択方法 Download PDFInfo
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- WO2004109709A1 WO2004109709A1 PCT/JP2003/007233 JP0307233W WO2004109709A1 WO 2004109709 A1 WO2004109709 A1 WO 2004109709A1 JP 0307233 W JP0307233 W JP 0307233W WO 2004109709 A1 WO2004109709 A1 WO 2004109709A1
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- bit line
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- bit lines
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C8/00—Arrangements for selecting an address in a digital store
- G11C8/10—Decoders
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C5/00—Details of stores covered by group G11C11/00
- G11C5/06—Arrangements for interconnecting storage elements electrically, e.g. by wiring
- G11C5/063—Voltage and signal distribution in integrated semi-conductor memory access lines, e.g. word-line, bit-line, cross-over resistance, propagation delay
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/02—Arrangements for writing information into, or reading information out from, a digital store with means for avoiding parasitic signals
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/18—Bit line organisation; Bit line lay-out
Definitions
- the present invention relates to a technology for selecting a bit line in a semiconductor memory device, and more particularly to a technology for selecting a bit line when a plurality of bit lines are sequentially and sequentially selected.
- a memory cell array is divided into a plurality of sub-arrays, and one bit line is sequentially selected from a plurality of bit lines provided for each sub-array and data is read out. And continuous read operations such as burst read access.
- FIG. 1 An example of a circuit configuration using a nonvolatile semiconductor memory device such as a flash memory as disclosed in Patent Document 1 is shown in FIG.
- the memory cell array is identified by column address A (k + 4) and other addresses, subarray AA (identified by low-level column address A (k + 4)), and subarray AB (high-level column address.
- a (k + 4)) is divided into sub-arrays.
- Each of the sub-arrays AA and AB is further divided into a left area AA0, ABO and a right area AA1, AB1, each of which includes a plurality of nonvolatile transistors and a plurality of read lines and a plurality of read lines. It is located at the intersection with the bit line.
- bit lines BL0A to BL15A via the nonvolatile transistors selected according to one of the plurality of read lines activated, WLn, BL OB ⁇ : BL 15 B (subarray AB) is connected or disconnected from ground potential.
- the data stored in the nonvolatile transistor is determined by each bit line] ⁇ 08-8] ⁇ 158, BL0B-BL 1 TJP2003 / 007233
- Each of the bit lines BL0A to BL15A is controlled by an upper column decoder 11 and an upper pass gate 21 0, 211, and a lower pass gate 220 by a coder 12 in the lower column.
- One bit line is selected and connected to the DB line.
- FIG. 11 shows a case where selection is performed by using four bit column addresses of column addresses A (k) to A (k + 3).
- the column addresses A (k + 1) to A (k + 3) are decoded by the upper column decoder l1 to output one of the decode signals YD10 to YD17;
- a predetermined gate transistor in 210, 211 is selected.
- the column address A (k) is decoded by the lower column decoder 12 and one of the decode signals YD 20 and YD 21 is output, so that the two pass gate transistors in the lower pass gate 220 are output. Either one is selected.
- the sub-arrays A A and A B are identified by the column address A (k + 4) and other addresses not shown. Alternatively, this is done by connecting to a different bus.
- the current-voltage conversion circuit 320 is connected to the data line DB.
- the current flowing through the path formed by the nonvolatile transistor selected by the line WLn is converted into a voltage, and is compared with the comparison voltage VRF by the subsequent amplifier 330 to perform data amplification.
- Figure 12 shows the order of the selected bit lines connected to the data line DB according to the increment of the column address.
- the lower column address A (k) switches at each address increment, and the decode signals YD20 and YD21 are alternately selected.
- the upper column addresses A (k + 1) to A (k + 3) are incremented for each round of the lower column address A (k), and the decode signals YD10 to YD17 are sequentially selected.
- the selected bit lines are sequentially selected in the left / right area AA 0 and AA 1 while alternately switching between the left area AA 0 and the right area AA 1. To go.
- a reset operation is performed by the reset circuit 310 to discharge the electric charges on the data line DB and the selected bit line to the ground voltage.
- Patent Document 2 discloses a technique of arranging a ground shield line between a selected bit line and an adjacent non-selected bit line in order to prevent interference due to capacitive coupling between adjacent bit lines. It has been disclosed.
- Patent Documents 1 and 2 exemplified as prior art documents are as follows.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2000-2013
- Patent Document 2 Japanese Patent Application Laid-Open No. Hei 9-1-2454593
- bit lines BL15A and BLOB that are adjacent to each other are continuously connected at the boundary of the subarrays AA and AB.
- bit line selection of (16) and bit line selection of (17) With the recent miniaturization and large capacity of semiconductor memory devices, the spacing between bit lines has become narrower and the bit line length has become longer, and the parasitic capacitance between the bit lines together with the wiring capacity of the bit lines themselves has been increasing. The parasitic capacitance between lines has become large. In addition, there is a demand for faster readout operations.
- the data line and the selected bit line need to be charged to the equalizing voltage (for example, about 0.6 V), but the reset at the time of bit line switching is required. It is necessary to discharge the equalize voltage of the bit line to the ground voltage in the reset operation.
- This discharge circuit is the reset circuit 310.
- the wiring capacity of the bit line itself increases and the amount of charge to be discharged increases, and a CR time constant circuit is formed with the wiring resistance of the bit line, causing a delay in the discharge operation. May be.
- the voltage level of the bit line is not sufficiently discharged to the ground voltage, and the charge remaining on the bit line is transferred to the nonvolatile transistor selected by the word line WLn.
- the charge is discharged through the non-volatile transistor. Since this discharge operation is performed in the read operation of the next cycle, if the bit line selected in the next cycle is an adjacent bit line and the read data is “0” data, the bit In some cases, the charge may be capacitively coupled from the selected bit line to the non-selected bit line where the discharging operation is performed via the inter-line parasitic capacitance between the G lines.
- unexpected current may flow to the data line DB when reading "0" data, which originally does not flow, and may be erroneously detected as "1" data.
- An object of the present invention is to provide a semiconductor memory device capable of performing a continuous access operation stably and a method of selecting a bit line of the semiconductor memory device. Disclosure of the invention
- the semiconductor memory device wherein the bit lines are sequentially selected and connected to an amplifier circuit in a state where the memory cells are connected to each of the plurality of bit lines.
- a physically continuous bit line is used as a basic decode unit for each bit line identified by a predetermined number of upper identification addresses, and a lower identification address of a predetermined number of bits is used.
- An address conversion unit is provided for assigning at least one of the first address and the last address to a bit line at a physical position other than the bit lines at both ends of the basic bit line group.
- the identification address sequentially incremented is obtained by decoding one lower identification address by a lower identification address decoder and forming one basic decoding unit from a basic decoding unit constituting a basic bit line group.
- C Select the unit sequentially.
- the upper identification address is decoded by the upper identification address decoder, and the bit lines in the basic decoding unit are sequentially selected.
- at least one of the bit lines on both ends of the basic bit line group is selected by the address conversion unit except for the first address or the last address selected by the identification address.
- bit line selection method for a semiconductor memory device the bit line is sequentially selected and connected to the amplifier circuit in a state where the memory cell is connected to each of the plurality of bit lines.
- a physically continuous bit line is used as a basic decoding unit for each bit line identified by a predetermined number of partial identification addresses, and two or more basic decoding units are used.
- the bit line identification within the basic decoding unit is the same, and the bits are divided and arranged in the basic bit line group.
- the sequential selection of gate lines is divided into a priority selection step in which the physical position of the bit line within the basic decode unit is fixed and the basic decode unit to be selected is sequentially changed, and a basic bit line group Bit Of sequentially selected lines, little of the initial selection or final selection
- a selection assignment step for assigning at least one of the bit lines at a physical position other than the bit lines at both ends of the basic bit line group.
- the selection bit line in the basic decoding unit is selected.
- the physical position is fixed, and the sequential change of the basic decoding unit that constitutes the basic bit line group is performed with priority.
- the selection of bit lines within the basic decode unit switches.
- the selection allocating step at least one of the first selection and / or the last selection of the sequential selection of the bit lines is allocated to the bit lines at physical positions other than the bit lines at both ends of the basic bit line group. .
- the lower identification address is used in the basic bit line group that divides the physically continuous bit lines.
- the basic decoding unit is sequentially selected for each access by the lower identification address decoder to be decoded or the priority selection step.
- the physical position of the bit line within the basic decoding unit is fixed.
- each basic decoding unit is arranged with the same bit line identification order within the basic decoding unit, that is, arranged while maintaining the bit line selection order configuration in the basic decoding unit in the same direction.
- the bit lines sequentially selected between adjacent accesses are arranged at physical positions separated by the pitch of the number of bit lines constituting the basic decode unit. Bit line.
- the line-to-line parasitic capacitance existing between the sequentially selected bit lines becomes very small, and the electrical state remaining on the bit line selected by the preceding access becomes smaller than the bit line selected by the subsequent access. No negative effects.
- bit lines it is not necessary to provide a shield line between adjacent bit lines in order to eliminate an adverse effect due to the parasitic capacitance between lines, and it is possible to efficiently arrange bit lines in a memory cell array, which is preferable for chip integration.
- the semiconductor memory device is the semiconductor memory device according to claim 1, wherein the basic decode unit includes 2 n bit lines identified by an n-bit upper identification address.
- the basic bit line group has two basic decode units identified by a 1-bit lower identification address, and the address conversion unit determines the address of the highest bit position of the upper identification address. It is characterized by inverting the logic level of the address at the remaining bit position according to the logic level.
- a basic decode unit includes 2 n bit lines, and each bit line is identified by an n-bit upper identification address.
- the basic bit line group is configured by shifting two basic decoding units.
- the upper identification address is decoded by the upper identification address decoder by inverting the logical level of the address at the remaining bit position according to the logical level of the address at the most significant bit position by the address conversion unit.
- the basic decoding unit is based on an n-bit partial identification address. comprises a 2 n the bits lines to be identified, the basic bit line group comprises two basic decoding unit, selected assignment step is a bit line disposed on the base Decorating one degrees 2 ( n Divide into n sub-units, select one in ascending order with respect to the physical position of the bit line in one sub-unit, and select in descending order with respect to the physical position of the bit line in the other sub-unit It is characterized by.
- a basic decoding unit is configured with 2 n bit lines, and each bit line is identified by an n-bit partial identification address. You.
- the basic bit line group consists of two bases. This unit is configured by shifting the decod units.
- the 2 n bit lines arranged in the basic decoding unit are divided into 2 ( n sub units for each n) by the selection assignment step, and one of them is selected in ascending order with respect to the physical position of the bit line. And the other is selected in descending order.
- bit line located at the first physical position is selected in descending order ⁇ , and the latter bit line is selected in ascending order, whereas the logical level of the address at the highest bit position is “1”
- bit line arranged at the latter physical position in the sub-units divided into two ( ⁇ ) is selected in descending order, The first half bit lines are selected in ascending order.
- the semiconductor memory device is the semiconductor memory device according to claim 1, wherein the basic decoding unit includes 2 n bit lines identified by an n-bit upper identification address.
- the basic bit line group has a 2 m basic decoding unit identified by a lower identification address of m (m ⁇ 2) bits, and the address translator has the uppermost or lower identification address of the upper or lower identification address.
- the logic level of the address at the remaining bit position is inverted according to the logic level of the address at the bit position.
- a basic decode unit includes 2 n bit lines, and each bit line is identified by a higher identification address of ⁇ bits.
- the basic bit line group is configured by shifting 2 m of basic decoding units, and is identified by a lower identification address of m (m ⁇ 2) bits. The upper or lower identification address is sent to the address translator. 7233
- the logic level of the address at the remaining bit position is inverted according to the logic level of the address at the most significant bit position after 9 and decoded by the upper or lower identification address decoder.
- the basic decoding unit is based on an n-bit partial identification address. It has 2 n bit lines to be identified, the basic bit line group has 2 m ( m ⁇ 2) basic decoding units, and the selective allocation step consists of bits assigned to the basic decoding units.
- the door line 2 - 1] is divided into sub-units of each book or basic bit basic decoding unit arranged on preparative line groups 2, - divided into sub-decoding units per, one sub-unit or sub-decode In the unit, select in ascending order with respect to the physical position of the bit line or basic decoding unit, and in the other sub-unit or sub-decoding unit, select in the descending order with respect to the physical position of the bit line or basic decoding unit. Characterized in that it-option.
- a basic decode unit is configured with 2 n bit lines, and each bit line is formed by an n-bit partial identification address. Be identified.
- the basic bit line group is configured by shifting 2 m basic decode units.
- the 2 n bit lines or 2 m basic decode units are divided into 2 (n — sub-units per line or 2 (m “ 1 ⁇ ) sub-decode units by the selection allocation step. One is selected in ascending order with respect to the physical position, and the other is selected in descending order.
- 2n bit lines can be divided into two sub-units, one of which can be selected in ascending order and the other can be selected in descending order.
- 2 m Can be divided into two sub-decode units and one of them can be selected in ascending order and the other can be selected in descending order.
- the semiconductor memory device is the semiconductor memory device according to claim 1, wherein the basic decoding unit includes 2 n bit lines identified by an n-bit upper identification address.
- the basic bit line group, m (m ⁇ 2) comprises a basic Decorating one de unit of the 2 m identified Ri by the bits of the lower identification Adoresu, address translation unit, the upper or lower identification address Among them, the logic level of at least one address at a lower bit position than the predetermined bit position is inverted according to the logical level of the address at the predetermined bit position.
- a basic decode unit includes 2 n bit lines, and each bit line is identified by an n-bit upper identification address.
- the basic bit line group is configured by shifting 2 m basic decoding units, and is identified by a lower identification address of m (m ⁇ 2) bits.
- the upper or lower identification address is inverted by the address translator in accordance with the logical level of the address at the predetermined bit position, and the logical level of at least one address located at a lower bit position than the predetermined bit position is inverted to be higher or lower. Decoded by the identification address decoder.
- the first or last selection of the bit line in the basic decode unit or the basic decode unit in the basic bit line group is determined by the end bit line or the basic bit line in the basic decode unit.
- the physical position may be different from the basic decoding units arranged at both ends of the line group.
- the semiconductor memory device is the semiconductor memory device according to at least one of claims 2 to 4, wherein the address conversion unit includes an exclusive OR operation unit, Based on the exclusive OR operation of the address of the most significant bit position and the address of the remaining bit position, or the address of the specified bit position and the address of the lower bit position, the remaining bit position or lower bit is calculated. The logic level of the address at the bit position is inverted.
- a semiconductor memory device including an exclusive OR operation unit. Exclusive OR operation of
- the logical level of the address of the remaining bit position or the logical level of the address of the lower bit position is inverted / non-inverted according to the address of the most significant bit position or the logical level of the address of the predetermined bit position. Can be controlled.
- the bit lines are sequentially selected and connected to the amplifier circuit to perform continuous access.
- physically continuous bit lines are divided into four basic bit line groups each composed of four bit lines, and the selection order of the bit lines in the basic bit line group is determined.
- the upper identification address is assigned to the lower physical address that identifies the physical location of the bit line
- the inverted lower identification address is assigned to the upper physical address that identifies the physical location of the bit line. It is characterized by comprising an address conversion unit for assigning to an address.
- the semiconductor memory device wherein, of the two-bit identification addresses for identifying the order of selecting the bit lines in the basic bit line group, the inverted higher-order identification address is the physical position of the bit line. And a lower-order physical address for identifying the physical position of the bit line.
- one of the two-bit identification addresses for identifying the selection order of the bit lines in the basic bit line group is logically inverted, and then the bit position is inverted. Assign to upper and lower physical addresses that identify the physical location of the bit line.
- the semiconductor memory device is the semiconductor memory device according to claim 6 or 7, wherein the basic bit line group for partitioning physically continuous bit lines is an adjacent basic bit line. It is characterized in that the bit line identification order is the same or inverted between the groups.
- the basic bit line group that separates the physically continuous bit lines is a bit line identification between adjacent basic bit line groups. They are arranged in the same order (shift arrangement) or reversed (mirror arrangement).
- bit lines are sequentially selected and connected to the amplifier circuit in a state where the storage cell is connected to each of the plurality of bit lines. Therefore, when continuous access is performed, physically continuous bit lines are divided into basic bit line groups composed of four bit lines, and divided into basic bit line groups.
- the order of the sequential selection for the physical position of the bit line is the first selection order in which the third physical position, the first physical position, the fourth physical position, and the second physical position are selected in that order, or (2)
- the intra-group selection step which is the second selection order selected in the order of the physical position, the fourth physical position, the first physical position, and the third physical position, and the physically continuous bit lines are the first or the second.
- Basic with one of the second selection order Partitioned by Tsu preparative line group, or characterized by having an inter-group compartments steps defined by the basic bit line group having first and second selection order are alternately arranged.
- the selection order of the bit lines in the basic bit line group is the first selection order or ⁇ is the second selection order by the intra-group selection step. It is said. Also, by the inter-group partitioning step, physically continuous bit lines are partitioned by a basic bit line group having either one of the first or second selection order (the basic bit line group has a The layout is defined by alternately arranging the basic bit line groups having the first and second selection orders (mirror arrangement of the basic bit line group).
- the order of selecting the bit lines in the basic bit line group can be the first or second selection order.
- the arrangement between the basic bit line groups can be either a shift arrangement or a mirror arrangement.
- a basic bit line group that partitions physically continuous bit lines when successive accesses are performed by sequentially selecting individual bit lines and connecting them to an amplifier circuit, they are sequentially selected between adjacent accesses
- the bit lines are not physically adjacent to each other, but can be bit lines arranged at physical positions separated by a sufficient distance.
- the line-to-line parasitic capacitance existing between the sequentially selected bit lines is negligible, and the electrical state remaining on the bit line selected by the preceding access is less than that of the bit line selected by the subsequent access. There is no adverse effect.
- bit line wiring capacitance and the parasitic capacitance between adjacent bit lines due to the miniaturization and large capacity of semiconductor storage devices, and the residual charge of bit lines after access due to high speed
- FIG. 1 is a circuit diagram of the first embodiment.
- FIG. 2 is another circuit example having the same operation and effect as the first embodiment.
- FIG. 3 is a schematic diagram showing a bit line selection order in the first embodiment.
- FIG. 4 is a first modification of the first embodiment.
- FIG. 5 shows a second modification of the first embodiment.
- FIG. 6 shows a third modification of the first embodiment.
- FIG. 7 is a fourth modification of the first embodiment.
- FIG. 8 is a circuit diagram of the second embodiment.
- FIG. 9 is a first modification of the second embodiment.
- FIG. 10 shows a second modification of the second embodiment. 3007233
- FIG. 11 is a circuit diagram of the prior art.
- FIG. 12 is a schematic diagram showing the order of selecting bit lines in the prior art.
- FIG. 13 shows another example of the second circuit having the same operation and effect as the first embodiment.
- FIG. 3 is a circuit diagram showing a circuit configuration for selecting a bit line and connecting it to a data line D #, and a method for selecting a bit line.
- the memory cell array is divided into a plurality of sub-arrays A ⁇ , ⁇ , ⁇ '.
- the figure shows that two subarrays AA and AB are identified by the column address A (k + 4).
- the memory cell array is generally divided into a larger number of sub-arrays by a plurality of addresses including a column address A (k + 4). Alternatively, this is done by connecting to a different bus overnight.
- FIG. 1 illustrates a nonvolatile semiconductor memory device such as a flash memory, in which an electrically rewritable nonvolatile transistor MC is arranged as a memory cell between a bit line and a ground voltage. I have.
- the word lines are wired through the sub-arrays AA, AB,... In the memory cell array, and the bit lines BL 0A to BL 15A, BL OB wired to the respective sub-arrays ⁇ , ⁇ ,. ⁇ : Commonly connected to the gate terminals of the non-volatile transistors MC arranged for each BL 15 B, ⁇ , ⁇ .
- FIG. 1 shows a word line WLn as an example. When the word line WLn is activated to a predetermined voltage level, the non-volatile transistor MC is biased. However, the threshold voltage of the non-volatile transistor MC changes depending on whether the memory cell is “0” or “1”.
- the state is set. Specifically, the threshold voltage of the nonvolatile memory storing the data “1” is low, and the bit line and the ground voltage are made conductive so that a current path is formed. Conversely, the threshold voltage of the non-volatile memory in which "0" is stored is high, and the current path is not formed because the bit line and the ground voltage are kept in a non-conductive state. As a result, data is read out from the memory cell selected by the word line WLn to each bit line BL0A to: BL15A, BLOB to: BL15B,.
- the read data is decoded by column addresses A (k) to A (k + 4) and, if necessary, by an address (not shown) for identifying the subarray, and one selected bit line is displayed.
- the data is read out by being connected to the data line DB, and is differentially amplified between the reference voltage VRF in the differential amplifier 330 via the current-voltage conversion circuit 320.
- variable k in the column address A (k) indicates a predetermined bit position. It shows bit positions allocated according to the addressing configuration in the semiconductor memory device.
- FIG. 1 it is assumed that a bit line is selected based on 4-bit column addresses A (k) to A (k + 3).
- the upper column addresses A (k + 1) to A (K + 3) are decoded by the upper column decoder 11 and the upper pass gate 21 Bit lines BL 0A to BL 7 A and BL 8 A ...: Select the pass gate transistor composed of NMOS transistor provided for each BL 15 A at 0 and 211 .
- lower column address A (k) Is decoded by the lower column decoder 12, and a pass gate transistor composed of two NMOS transistors in the lower pass gate 220 is selected.
- Upper column decoder 11 outputs decode signals YD 10 -YD 17 according to the logic levels of upper column addresses A (k + 1) to A (K + 3).
- An address conversion circuit 20 is provided at the address input stage.
- the address conversion circuit 20 is provided with two exclusive OR gates, and replaces the column addresses A (k + 1) and A (k + 2) input in the prior art with a column address A (k + The exclusive OR of 1) and A (k + 3) and the exclusive OR of column addresses A (k + 2) and A (k + 3) are input to the upper column address 11.
- the exclusive OR outputs a low-level signal when the logic levels match and outputs a high-level signal when the logic levels do not match.Therefore, the remaining upper columns are determined according to the logic level of the highest column address A (k + 3). The logic levels of the addresses A (k + 1) and A (k + 2) are inverted.
- the lower column decoders 1 and 2 have a lower level column address A (k) Outputs a decode signal YD 20 to the left array AA 0 in the sub-array AA.
- the decoder outputs a decode signal YD21 and selects the right area AA1 in the subarray AA.
- the upper pass gates 210, 211,... Arranged in the sub-arrays ⁇ , ⁇ ,... ′ Have the same configuration as each other and the pass gate transistors located at the same physical position. Are commonly controlled by the same decoded signals YD10 to YD17.
- the lower pass gates 220,... Arranged in each of the sub-arrays AA, AB,... 'Have the same configuration as each other, and the pass gate transistors located at the same physical position as each other are the same. Conduction control is commonly performed by the decoded signals YD20 and YD21. Therefore, the bit lines BL0A to BL15A, BLOB ... in each subarray AA, AB, ... 'are determined by the column addresses A (k) to A (k + 3) of BL15B, ...'. The selection order is the same between the sub-arrays (this configuration is hereinafter referred to as a shift arrangement).
- the upper / lower column decoders 11/12 select one of the bit lines BL 0 A to BL 1 5.A wired to the sub-array AA, and set the selected bit line to the data line DB. Connected. When one selected bit line is connected to the data line DB, the equalizing signal EQ is activated to a high level in the current-voltage conversion circuit 320 prior to data reading.
- the NMOS transistor M21 conducts, and charging of the bit line from the data line DB is started via the lower passgate 220 and the upper passgate 210 or 211. In this case, the voltage level of the data line DB is detected by the NMOS transistor M23, and the gate voltage level of the NMOS transistor M22 is adjusted via the NMOS transistor M23. .
- the charging voltage of the path from the data line DB to the bit line is limited to about 0.6 V. This is a voltage limit to prevent the so-called disturb phenomenon, which is an unnecessary write operation due to the application of an excessive voltage level to the nonvolatile transistor during reading.
- the equalizing period ends and the NMOS transistor M21 becomes non-conductive.
- a differential amplifier is formed depending on whether or not a current path from the resistor R21 to the ground voltage is formed through the nonvolatile transistor constituting the storage cell to the ground voltage.
- the voltage level to 330 is set, and differential amplification for data readout is performed.
- the reset circuit 310 discharges the bit line connected from the data line DB via the upper / lower pass gate 210 or 211/220 to the ground voltage.
- the column address A (k) to A (K + 3), and the address ⁇ ( ⁇ ) depending on the burst length, while the selected word line WLn is maintained in the activated state. + 4) and an address not shown are sequentially incremented in each read cycle. That is, for each access, while the left area AA ⁇ and the right area AA1 of the subarray A ⁇ are alternately selected, the four right half areas in the left / right area AA 0 ZA A1 are further selected.
- Bit lines BL0A to BL3A, BL8A to: BL11A are sequentially selected in ascending order according to the physical arrangement, and then the left half four bit lines BL4A to BL7A , BL12A ⁇ : BL15A is sequentially selected in descending order with respect to the physical arrangement. Therefore, the bit lines selected in the adjacent access are separated by the distance of the eight bit line pitches constituting the left / right area AA 0 / AA 1, and in the adjacent access, The parasitic capacitance between the selected bit lines has a small capacitance value and does not cause any problem.
- bit lines selected in adjacent accesses are separated by the distance of the bit line pitch of four lines.
- the inter-line parasitic capacitance between the bit lines is very small and does not become a problem.
- the circuit diagram shown in FIG. 2 has the same operation and effect as the first embodiment (FIG. 1).
- FIG. instead of the address conversion circuit 20 in the first embodiment (FIG. 1), the decode signals YD14 to YD17 output from the upper column decoder 11 and the upper pass gates 210 and 211 are configured.
- the conversion unit 21 that converts the connection with the pass gate transistor or the bit line BL 4A ⁇ : BL 7A / BL 12 A ⁇ : The connection between the upper pass gate 2 1 0/2 1 1 and BL 15A If any one of the conversion units 23 is provided, the same operation and effect as those of the first embodiment (FIG. 1) can be obtained.
- the conversion units 21 and 23 are not limited to the configuration shown in FIG.
- connection configuration can be changed as appropriate. Further, if any one of the conversion units 2 123 is provided, the same operation and effect as those of the first embodiment (FIG. 1) can be obtained, and the conversion units 21 and 23 can be appropriately combined. It is possible to achieve the same effects and effects.
- FIG. 13 is another second circuit example having the same operation and effect as the other circuit examples shown in the first embodiment (FIG. 1) and FIG.
- the address input to the decoding unit of the column decoder is exchanged instead of the address conversion circuit 20 in FIG. 1 or the conversion unit 21 in FIG.
- FIG. 3 is a diagram schematically showing a bit line selection order according to the first embodiment.
- the physical arrangement of bit lines for a part of subarray AA (selected by low-level address A (k + 4)) and part of AB (selected by high-level address A (k + 4)) is shown.
- a plurality of bit lines BL0A to BL15A and BL0B to: BL3B are shown.
- the selection order is determined by the upper / lower column decoders 1 1/1 2 and the address conversion unit 20 or the conversion units 21, 23, and are shown by (1) to (23).
- the bit lines are sequentially selected in order.
- the 16 bit lines in the subarray AA are divided into the left / right areas AA0, AB0 by the decoded signals YD20, YD21 output from the lower column decoder 12.
- / AAA 1 for every 8 bit lines Is done.
- the order of selection in the unit of eight bit lines is selected by decode signals YD10 to YD17 sequentially output from the upper column decoder 11.
- the decode signals YD10 to YD17 are sequentially selected while the decode signals YD20 and YD21 are alternately switched at each transition of the column address.
- bit lines are selected in the order of two sets of eight bit lines BL0A ⁇ ; the same physical position in BL7A and BL8A ⁇ BL15A is alternately selected for each access, and the unit of eight bits is selected.
- the bit line BL0B in the subarray AB follows the bit line BL12A selected last in the subarray AA. Is selected.
- the distance between the bit lines when the data is successively accessed beyond the subarray is a distance corresponding to four bit line pitches.
- the first to third modifications of the first embodiment shown in FIGS. 4 to 6 are modifications of the address conversion circuit 20 (FIG. 1).
- it can be realized by providing an exclusive OR gate for the target column address.
- the logical level of the column address A (k + 2) is inverted.
- the logical level of the column address A (k + 1) is inverted.
- the selection order is reversed for the four right bit lines BL4A to BL7A and BL12A to BL15A in the unit of eight bit lines. That is, the selection order is the bit line BL5AZ13A, BL4A / 12A, BL7A / 15ABL6AZ14A.
- the two bit lines selected by adjacent accesses maintain a separation of eight bit line pitches in the selection within the subarray AA, and 2 bits in the selection between the subarrays AA and AB. The distance between the bit line pitches can be maintained.
- the logical level of the column address A (k + 1) is changed when the column address A (k + 2) at the bit position one bit lower than the highest bit is at the high level. Invert.
- the configuration is such that the ascending order selection and the descending order selection are repeated every two lines on a unit of eight bit lines. That is, the two bit lines selected by adjacent accesses are separated by a distance of 8 bit line pitches in the selection within the sub-array A A.
- Selection at the boundary between AA and AB can maintain the separation between the two bit line pitches.
- FIG. 7 a circuit diagram is shown in FIG. 7 as a fourth modification of the first embodiment.
- an upper / lower column decoder 13U / 13L is provided instead of the upper / lower column decoder 11/1 in the first embodiment.
- upper pass gates 410 to 413 and lower pass gates 420 are provided in place of the upper pass gates 210 and 211 and the lower pass gate 220.
- an address conversion circuit 25 is provided in place of the address conversion circuit 20.
- the upper pass gates 4 10 to 4 13 and the lower pass gate 4 20 are all composed of four pass gate transistors, and are provided for every four out of 16 bit lines in the subarray AA.
- One set of four bit lines is used to select one bit line from four sets of upper pass gates 410-413, and four sets of upper pass gates are set by lower pass gates 420. Select one from 4 10 to 4 13. Thus, one bit line is selected from the 16 bit lines.
- the upper column decoder 13U decodes the upper two bits of the column addresses A (k + 2) and A (k + 3), and the lower column decoder 13L decodes the lower two bits of the column address A (k). , A (k + 1).
- the column address input to the upper column decoder 13 U is converted by the address conversion circuit 25. Equipped with an exclusive OR gate that performs exclusive OR control of column addresses A (k + 2) and A (k + 3). Exclusive OR is used instead of input of column address A (k + 2). The gate output signal is input.
- bit lines are divided into right and left two bit lines in units of four bit lines, the left two bit lines are selected in ascending order, and the right two bit lines are selected in descending order. (In the case of (A) in FIG. 7).
- the selection order of the bit lines is such that the upper pass gates 410 to 41 provided for every four bit lines select the bit lines at the same physical position. Meanwhile, the upper pass gates 410 to 4.13 are sequentially switched by the lower pass gate 420 for each access.
- bit lines selected between adjacent accesses in the sub-array A A have a separation distance of four bit line pitches, and also have a separation distance of four bit line pitches between adjacent sub-arrays.
- the bit line selected first or last can be a bit line at a physical position different from the bit positions at both ends of the subarray AA.
- the distance between the bit lines sequentially selected in the subarray AA can be sufficiently separated (in the case of (B) in FIG. 7).
- bit lines BL0A to BL15A, BL0B In the sub-arrays AA and AB, which are embodiments of the basic bit line group for partitioning the BL 15 B, continuous access is performed by sequentially selecting individual bit lines and connecting them to the differential amplifier 330 as an amplifier circuit.
- the column address A (k) (FIGS. 1 and 2) or A (k), A (k + l) (FIG. 7), which is the embodiment of the lower identification address, is converted to the lower identification address decoder It is decoded by the lower column decoder 12 (Figs. 1 and 2) or 13L (Fig.
- each left / right area AA0 / AA1, AB0 / AB1, or a bit line in units of four has bit lines in units of eight or four.
- bit line identification order is the same, and the left / right areas AA 0 / ⁇ 1, AB 0 / AB 1 or the bit lines in units of four are moved in parallel with each other (hereinafter referred to as shift This is referred to as “arrangement.”
- bit lines sequentially selected between adjacent accesses are the bit lines in the subarrays AA and AB
- the distance between the sequentially selected bit lines is determined by the left / right area.
- AA OZAA 1 A bit line that is located at a physical position separated by the distance of eight or four bit line pitches, which are the constituent units of AB0 / AB1.
- the address conversion circuit 20 FIGS. 1, 4 to 6
- 25 Fig. 7
- the conversion unit 21 or 23 (Fig. 2) invert the logical level of the column address at the lower bit position according to the logical level at the column address at the upper bit position.
- the first selected bit line or the last selected bit line in the subarrays AA and AB can be at a different physical position from the end bit lines. A sufficient distance between bit lines sequentially selected between subarrays can be ensured.
- bit lines can be routed with the minimum gap allowed by the design rules. In a memory cell array, bit lines can be efficiently routed to a minimum necessary area. When shortening the cycle time in burst read access in response to a request for high-speed access, the reset time of the bit line may be insufficient.
- the bit line forms a CR deconstant circuit in combination with the wiring resistance.
- the discharging operation by the reset circuit 310 arranged in the circuit becomes more and more difficult.
- a non-volatile semiconductor storage device such as a flash memory
- the remaining charge that cannot be completely discharged during the reset period is discharged after the next access cycle through a non-volatile transistor in which data "1" is stored. Will be done.
- the bias voltage on the bit line is limited to a low voltage of about 0.6 V to prevent erroneous writing to the non-volatile transistor due to the disturb phenomenon when reading data.
- the effect of the residual charge discharging operation is It does not extend to the selected bit line, and a stable read operation can be performed without being affected by capacitive coupling despite the low bias voltage on the bit line.
- the circuit diagram of the second embodiment shown in FIG. 8 shows that a plurality of bit lines arranged in the memory cell array are identified by a column address A (k + 2), and the bit lines BL 0 A to BL 3 A, BL 0 B to BL 3 B (basic bit line group) are divided, and one bit line is selected from these and connected to the data line DB.
- FIG. 4 is a circuit diagram showing a method of selecting a bit line.
- the sub-arrays AA and AB are divided into left / right areas AA 0 / AA 1 and AB OZAB 1 and bit lines are alternately selected from the left / right areas for each access Unlike the second embodiment, in the second embodiment, bit lines are sequentially selected in units of four basic bit lines.
- pass gates 510 and 511 are provided in place of the upper and lower pass gates 210 and 211/220 of the first embodiment (FIG. 1), and a unit of four It is connected to data line D # via a pass gate transistor provided for each basic bit line group. Also, a column decoder 13U is provided in place of the upper / lower column decoders 11/12, and the output decode signals YD10 to YD13 provide for each of the pass gates 510 and 511. Select one passgate transistor.
- the pass gates 5 10 and 5 11 1 have the same configuration, and the decode signals YD 10 to YD 13 for controlling the conduction of each pass gate transistor are commonly connected.
- a bit line at the same physical position is selected for the decoded signal (hereinafter, referred to as a shift arrangement of the basic bit line group).
- an address conversion circuit 27 is provided in place of the address conversion circuit 20.
- the column addresses A (k) and A (k + 1) input to the column decoder 13U are inverted with respect to the column address A (k), and then the bit positions are inverted and supplied. Therefore, the column decoder 13 U selects the address according to each of the logical levels of the column addresses A (k) and A (k + 1).
- the output positions of the decoded signals YD10 to YD13 are converted.
- the selection order of the basic bit line group in units of four is BL 2 A, BL 0 A, BL 3 A, BL 1 A, BL 2 B, BL 0 B, BL 3 B, and BL IB. Order.
- the distance between the bit lines selected in adjacent accesses has a separation distance of 2 or 3 bit line pitches within the basic bit line group of 4 units, and the basic bit line of 4 units In the case of an access beyond the group, the access distance is equivalent to a 5-bit pitch.
- the decoded signals YD 10 to YD 13 for controlling the pass gate transistors are used instead of the pass gates 5 11 in the second embodiment shown in FIG.
- a pass gate 5 12 whose supply order is reversed. Therefore, the bit lines BL 0 A to BL 3 A and the bit lines BL 0 B to BL 3 B are in a mirror-symmetrical order in which the bit lines are selected.
- bit lines in the basic bit line group in units of four is BL 2 ABL 0A, BL 3A, BL 1 A, BL 1 B, BL 3 B, BL 0 B, BL 2 B
- the order is as follows.
- the distance between the bit lines selected for adjacent accesses has a separation distance of 2 or 3 bit line pitches within the basic bit line group of 4 units, and In the case of access beyond the basic bit line group, it has a separation distance of 4 bit line pitch.
- an address conversion circuit 29 is provided in place of the address conversion circuit 27 in the second embodiment in FIG.
- the column address A (k + 1) is logically inverted, while the column address A (k + 2) is logically inverted and supplied.
- a shift arrangement with pass gates 5 10 and 5 11 or a mirror arrangement with pass gates 5 10 and 5 12 can be selected.
- the selection order of the basic bit line groups in units of four is shifted. If so, the order is BL1A, BL3A, BL0A, BL2A, BL1B, BL3B, BLOB, BL2B. When mirrors are arranged, the order is BL1A, BL3A, BL0A, BL2A, BL2B, BLOB, BL3B, and BL1B.
- the distance between the bit lines selected in adjacent accesses has a separation distance of 2 or 3 bit line pitches in the basic bit line group of 4 units, and the bit line of 4 units In the case of an access exceeding the limit, a separation distance of 3 bit line pitch (in the case of shift arrangement) or 4 bit line pitch (in the case of mirror arrangement) is obtained.
- the two-bit identification address for identifying the bit line selection order is implemented.
- the bit position is reversed after the logical inversion, so that the selection order of the bit lines in the basic bit line group is as follows.
- the selection order (FIGS. 8 and 9) or the second selection order (FIG. 10) can be used.
- the arrangement between the basic bit line groups can be either a shift arrangement or a mirror arrangement.
- the bit lines sequentially selected between adjacent accesses can be 2 to 4 bits without being physically adjacent. It can be a bit line located at a physical position that is separated by a sufficient distance, that is, the separation distance of the line pitch.
- the line-to-line parasitic capacitance existing between the sequentially selected bit lines is small, and the electrical state remaining on the bit line selected by the preceding access is changed by the bit line selected by the subsequent access It does not adversely affect o
- bit line wiring capacitance and the parasitic capacitance between adjacent bit lines due to the miniaturization and large capacity of semiconductor storage devices, and the residual charge of bit lines after access due to high speed
- the present invention is not limited to the above-described embodiment, and it goes without saying that various improvements and modifications can be made without departing from the spirit of the present invention.
- a non-volatile semiconductor memory device such as a flash memory has been described as an example of the semiconductor memory device.
- the present invention is not limited to this.
- a semiconductor memory device or the like in which bit lines are sequentially selected and connected to an amplifier circuit so that continuous access is performed in a state where the memory cells are connected.
- a circuit configuration is applied to the selected bit line by capacitive coupling due to the parasitic capacitance, the same can be applied.
- the circuit example in the embodiment is not a circuit specified in the semiconductor memory device, but is used in a memory integrated in a semiconductor integrated circuit device other than the semiconductor memory device. Also have the same circuit configuration, and it goes without saying that the present invention can be applied.
- the burst read access has been described as an example of the continuous access.
- the present invention is not limited to this. It can be similarly effective in a write operation that needs not to act on the line. Industrial applicability
- continuous access operation can be stabilized without increasing the die size of a chip, eliminating the adverse effects caused by capacitive coupling from adjacent bit lines. It is possible to provide a semiconductor memory device and a bit line selection method for the semiconductor memory device that can be performed by performing the above operations.
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNB038257955A CN100470676C (zh) | 2003-06-06 | 2003-06-06 | 半导体存储装置以及半导体存储装置的位线选择方法 |
JP2005500563A JP4060330B2 (ja) | 2003-06-06 | 2003-06-06 | 半導体記憶装置、および半導体記憶装置のビット線選択方法 |
PCT/JP2003/007233 WO2004109709A1 (ja) | 2003-06-06 | 2003-06-06 | 半導体記憶装置、および半導体記憶装置のビット線選択方法 |
US11/155,510 US7190630B2 (en) | 2003-06-06 | 2005-06-20 | Semiconductor storage device and method of selecting bit line of the semiconductor storage device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2003/007233 WO2004109709A1 (ja) | 2003-06-06 | 2003-06-06 | 半導体記憶装置、および半導体記憶装置のビット線選択方法 |
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US11/155,510 Continuation US7190630B2 (en) | 2003-06-06 | 2005-06-20 | Semiconductor storage device and method of selecting bit line of the semiconductor storage device |
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WO2004109709A1 true WO2004109709A1 (ja) | 2004-12-16 |
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PCT/JP2003/007233 WO2004109709A1 (ja) | 2003-06-06 | 2003-06-06 | 半導体記憶装置、および半導体記憶装置のビット線選択方法 |
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US (1) | US7190630B2 (ja) |
JP (1) | JP4060330B2 (ja) |
CN (1) | CN100470676C (ja) |
WO (1) | WO2004109709A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009151892A (ja) * | 2007-12-21 | 2009-07-09 | Samsung Electronics Co Ltd | 半導体記憶装置 |
JP2022544948A (ja) * | 2019-08-14 | 2022-10-24 | スーパーメム,アイエヌシー. | コンピューティングメモリシステム |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
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JP4341630B2 (ja) * | 2006-01-30 | 2009-10-07 | ソニー株式会社 | 固体撮像装置、固体撮像装置の駆動方法および撮像装置 |
KR100732633B1 (ko) * | 2006-02-01 | 2007-06-27 | 삼성전자주식회사 | 비연속적인 비트라인 디코딩을 수행하는 플래시 메모리장치 |
JP5853219B2 (ja) * | 2011-07-01 | 2016-02-09 | パナソニックIpマネジメント株式会社 | メモリアクセス制御装置、及び製造方法 |
CN104299651B (zh) * | 2013-07-16 | 2017-06-06 | 上海华虹宏力半导体制造有限公司 | 闪存的位线选择管电路 |
JP2015176870A (ja) * | 2014-03-12 | 2015-10-05 | 株式会社東芝 | 不揮発性半導体記憶装置 |
CN108091363B (zh) * | 2016-11-23 | 2020-11-17 | 中芯国际集成电路制造(上海)有限公司 | 一种位线地址选择电路及包含该电路的非易失性存储器 |
CN109308928B (zh) * | 2017-07-28 | 2020-10-27 | 华邦电子股份有限公司 | 存储器装置的行解码器 |
CN108111149A (zh) * | 2017-12-20 | 2018-06-01 | 中国科学院长春光学精密机械与物理研究所 | 一种多通道模拟开关的抗串扰的方法 |
US11587610B2 (en) * | 2021-05-28 | 2023-02-21 | Microsoft Technology Licensing, Llc | Memory having flying bitlines for improved burst mode read operations |
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- 2003-06-06 CN CNB038257955A patent/CN100470676C/zh not_active Expired - Fee Related
- 2003-06-06 JP JP2005500563A patent/JP4060330B2/ja not_active Expired - Fee Related
- 2003-06-06 WO PCT/JP2003/007233 patent/WO2004109709A1/ja active Application Filing
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JPH09245493A (ja) * | 1996-03-07 | 1997-09-19 | Hitachi Ltd | 不揮発性半導体記憶装置 |
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JP2022544948A (ja) * | 2019-08-14 | 2022-10-24 | スーパーメム,アイエヌシー. | コンピューティングメモリシステム |
Also Published As
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JPWO2004109709A1 (ja) | 2006-07-20 |
CN1720589A (zh) | 2006-01-11 |
JP4060330B2 (ja) | 2008-03-12 |
CN100470676C (zh) | 2009-03-18 |
US7190630B2 (en) | 2007-03-13 |
US20050276147A1 (en) | 2005-12-15 |
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