Patents by Inventor Toru Miwa

Toru Miwa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20240136001
    Abstract: A memory system programs memory cells connected to a selected word line by applying doses of programming and performing program-verify between doses. An efficient and low current program-verify operation includes: while scanning the results of a previous program-verify operation, ramp up voltages on the select lines for the next program-verify operation without waiting for the scan to complete and ramp up voltages on unselected word lines for the next program-verify operation following a step signal (so that voltage applied to the unselected word lines rise in steps) without waiting for the scan to complete.
    Type: Application
    Filed: July 23, 2023
    Publication date: April 25, 2024
    Applicant: SanDisk Technologies LLC
    Inventors: Abu Naser Zainuddin, Jiahui Yuan, Toru Miwa
  • Publication number: 20240128134
    Abstract: A semiconductor wafer includes pairs of semiconductor dies having test pads which are electrically coupled to each other to enable testing of pairs of semiconductor dies together at the same time. In this way, even wafers having large numbers of semiconductor dies can be tested with a semiconductor test assembly in a single touch-down test process.
    Type: Application
    Filed: July 13, 2023
    Publication date: April 18, 2024
    Inventors: Toru Miwa, Takashi Murai, Hiroyuki Ogawa
  • Publication number: 20240128132
    Abstract: A semiconductor wafer includes pairs of semiconductor dies having test pads which are electrically coupled to each other to enable testing of pairs of semiconductor dies together at the same time. In this way, even wafers having large numbers of semiconductor dies can be tested with a semiconductor test assembly in a single touch-down test process.
    Type: Application
    Filed: July 13, 2023
    Publication date: April 18, 2024
    Applicant: SanDisk Technologies LLC
    Inventors: Toru Miwa, Takashi Murai, Hiroyuki Ogawa, Nisha Padattil Kuliyampattil
  • Publication number: 20240125846
    Abstract: A semiconductor wafer includes pairs of semiconductor dies having test pads which are electrically coupled to each other to enable testing of pairs of semiconductor dies together at the same time. In this way, even wafers having large numbers of semiconductor dies can be tested with a semiconductor test assembly in a single touch-down test process.
    Type: Application
    Filed: July 13, 2023
    Publication date: April 18, 2024
    Applicant: SanDisk Technologies LLC
    Inventors: Toru Miwa, Takashi Murai, Hiroyuki Ogawa, Nisha Padattil Kuliyampattil
  • Patent number: 11875043
    Abstract: To reduce spikes in the current used by a NAND memory die during a write operation using smart verify, different amounts of delay are introduced into the loops of the programing algorithm. Depending on the number of verify levels following a programming pulse, differing amounts of wait time are used before biasing a selected word line to the verify levels or levels. For example, if only a single verify level is used, a shorter delay is used than if two verify levels are used.
    Type: Grant
    Filed: September 13, 2022
    Date of Patent: January 16, 2024
    Assignee: SanDisk Technologies LLC
    Inventors: Abu Naser Zainuddin, Jiahui Yuan, Toru Miwa
  • Publication number: 20230402113
    Abstract: A multi-stage method for programming an n-bit memory cell array using a fixed number of data latches is disclosed. The fixed number of data latches may be a reduced number of data latches in sense amplifier and data latch (SADL) peripheral circuitry than is required by existing programming techniques. As such, the die area taken up by the SADL circuitry can be reduced, which in turn, reduces overall chip area. The multi-stage programming method may include utilizing a first data latch to receive and store program page data and utilizing a second data latch to store bit information indicating which cells are to be targeted for the multi-stage programming. At each program stage, a respective program loop may be performed with respect to each threshold voltage distribution generated during a prior program stage to create two new threshold voltage distributions from the prior distribution.
    Type: Application
    Filed: June 13, 2022
    Publication date: December 14, 2023
    Inventors: TORU MIWA, Fumiaki Toyama
  • Patent number: 11625172
    Abstract: Apparatuses and techniques are described for programming data in memory cells while concurrently storing backup data. One or more initial pages of data are programmed into both a primary block and a first backup block in a first program pass. A power loss then occurs which can corrupt the data or otherwise prevent reading of the one or more initial pages of data from the primary block. The one or more initial pages of data are read from the first backup block and used to perform a second program pass in which one or more additional pages of data are programmed into the primary block. Single bit per cell data can be stored in a second backup block to decode the one or more initial pages of data as read from the first backup block.
    Type: Grant
    Filed: June 16, 2021
    Date of Patent: April 11, 2023
    Assignee: SanDisk Technologies LLC
    Inventors: Xiang Yang, Toru Miwa, Ken Oowada, Gerrit Jan Hemink
  • Patent number: 11551781
    Abstract: Apparatuses and techniques are described for programming data in memory cells while concurrently storing backup data. Initial pages of multiple bit per cell data are encoded to obtain at least first and second pages of single bit per cell data. The initial pages of multiple bit per cell data are programmed into a primary set of memory cells, while concurrently the first and second pages of single bit per cell data are programmed into first and second backup sets of memory cells, respectively. In the event of a power loss, the first and second pages of single bit per cell data are read from the first and second backup sets of memory cells, and decoded to recover the initial pages of multiple bit per cell data.
    Type: Grant
    Filed: June 16, 2021
    Date of Patent: January 10, 2023
    Assignee: SanDisk Technologies LLC
    Inventors: Xiang Yang, Toru Miwa, Ken Oowada, Gerrit Jan Hemink
  • Patent number: 11545221
    Abstract: Technology is disclosed herein for concurrently programming the same data pattern in multiple sets of non-volatile memory cells. Voltage are applied to bit lines in accordance with a data pattern. A select voltage is applied to drain select gates of multiple sets of NAND strings. The system concurrently applies a program pulse to control gates of a different set of selected memory cells in each respective set of the multiple sets of the NAND strings while the select voltage is applied to the drain select gates of the multiple sets of the NAND strings and the voltages are applied to the plurality of bit lines to concurrently program the data pattern into each set of the selected memory cells.
    Type: Grant
    Filed: June 28, 2021
    Date of Patent: January 3, 2023
    Assignee: SanDisk Technologies LLC
    Inventors: Xiang Yang, Gerrit Jan Hemink, Ken Oowada, Toru Miwa
  • Publication number: 20220406398
    Abstract: Apparatuses and techniques are described for programming data in memory cells while concurrently storing backup data. Initial pages of multiple bit per cell data are encoded to obtain at least first and second pages of single bit per cell data. The initial pages of multiple bit per cell data are programmed into a primary set of memory cells, while concurrently the first and second pages of single bit per cell data are programmed into first and second backup sets of memory cells, respectively. In the event of a power loss, the first and second pages of single bit per cell data are read from the first and second backup sets of memory cells, and decoded to recover the initial pages of multiple bit per cell data.
    Type: Application
    Filed: June 16, 2021
    Publication date: December 22, 2022
    Applicant: SanDisk Technologies LLC
    Inventors: Xiang Yang, Toru Miwa, Ken Oowada, Gerrit Jan Hemink
  • Publication number: 20220404989
    Abstract: Apparatuses and techniques are described for programming data in memory cells while concurrently storing backup data. One or more initial pages of data are programmed into both a primary block and a first backup block in a first program pass. A power loss then occurs which can corrupt the data or otherwise prevent reading of the one or more initial pages of data from the primary block. The one or more initial pages of data are read from the first backup block and used to perform a second program pass in which one or more additional pages of data are programmed into the primary block. Single bit per cell data can be stored in a second backup block to decode the one or more initial pages of data as read from the first backup block.
    Type: Application
    Filed: June 16, 2021
    Publication date: December 22, 2022
    Applicant: SanDisk Technologies LLC
    Inventors: Xiang Yang, Toru Miwa, Ken Oowada, Gerrit Jan Hemink
  • Patent number: 11342028
    Abstract: Apparatuses, systems, and methods are disclosed for concurrently programming non-volatile storage cells, such as those of an SLC NAND array. The non-volatile storage cells may be arranged into a first block comprising a first string of storage cells that intersects with a first word line at a first storage cell, a second block comprising a second string of storage cells that intersects with a second word line at a second storage cell, a bit line electrically connectable to the first string and the second string, and controller configured to apply a programming pulse, at an elevated voltage, to the first word line and second word line to concurrently program the first and second storage cells.
    Type: Grant
    Filed: April 12, 2021
    Date of Patent: May 24, 2022
    Assignee: SanDisk Technologies LLC
    Inventors: Xiang Yang, Aaron Lee, Gerrit Jan Hemink, Ken Oowada, Toru Miwa
  • Publication number: 20210358553
    Abstract: Technology is disclosed herein for concurrently programming the same data pattern in multiple sets of non-volatile memory cells. Voltage are applied to bit lines in accordance with a data pattern. A select voltage is applied to drain select gates of multiple sets of NAND strings. The system concurrently applies a program pulse to control gates of a different set of selected memory cells in each respective set of the multiple sets of the NAND strings while the select voltage is applied to the drain select gates of the multiple sets of the NAND strings and the voltages are applied to the plurality of bit lines to concurrently program the data pattern into each set of the selected memory cells.
    Type: Application
    Filed: June 28, 2021
    Publication date: November 18, 2021
    Applicant: SanDisk Technologies LLC
    Inventors: Xiang Yang, Gerrit Jan Hemink, Ken Oowada, Toru Miwa
  • Patent number: 11177277
    Abstract: A non-volatile memory apparatus is provided and includes a substrate having a major surface extending longitudinally. A stack of first and second sets of word lines and insulating layers extends along and over the major surface longitudinally and alternating with and overlying one another vertically to define a device region. The first and second sets of word lines each respectively extends longitudinally beyond a first and second side of the device region a decreasing longitudinal distance from the device region as a vertical distance from the major surface increases to define first and second stepped contact regions. Word line contacts extend vertically in the first and second stepped contact regions. The second set of word lines in the first stepped contact region do not contact the word line contacts and the first set of word lines in the second stepped contact region do not contact the word line contacts.
    Type: Grant
    Filed: November 6, 2019
    Date of Patent: November 16, 2021
    Assignee: SanDisk Technologies LLC
    Inventors: Naoki Ookuma, Hiroki Yabe, Koichiro Hayashi, Takuya Ariki, Toru Miwa
  • Patent number: 11081192
    Abstract: A non-volatile memory device comprising a memory cell region having a plurality of co-planar memory cell planes arranged in a plane parallel to a semiconductor substrate, with each memory cell plane comprising a plurality of sub-planes disposed adjacent one another along an axis that is parallel to the substrate. Further, each memory cell plane comprises a plurality of sense amplifier regions arranged along the axis in an alternating pattern with the sub-planes such that adjacent to each sub-plane is a sense amplifier region and each sense amplifier region is operable with respect to at least a fraction of the bit lines of the two sub-planes immediately adjacent the sense amplifier region.
    Type: Grant
    Filed: October 30, 2019
    Date of Patent: August 3, 2021
    Assignee: SanDiskTechnologies LLC
    Inventors: Hiroki Yabe, Koichiro Hayashi, Takuya Ariki, Yuki Fujita, Naoki Ookuma, Kazuki Yamauchi, Masahito Takehara, Toru Miwa
  • Publication number: 20210233589
    Abstract: Apparatuses, systems, and methods are disclosed for concurrently programming non-volatile storage cells, such as those of an SLC NAND array. The non-volatile storage cells may be arranged into a first block comprising a first string of storage cells that intersects with a first word line at a first storage cell, a second block comprising a second string of storage cells that intersects with a second word line at a second storage cell, a bit line electrically connectable to the first string and the second string, and controller configured to apply a programming pulse, at an elevated voltage, to the first word line and second word line to concurrently program the first and second storage cells.
    Type: Application
    Filed: April 12, 2021
    Publication date: July 29, 2021
    Applicant: SanDisk Technologies LLC
    Inventors: Xiang Yang, Aaron Lee, Gerrit Jan Hemink, Ken Oowada, Toru Miwa
  • Publication number: 20210142858
    Abstract: A random access memory is provided including a plane structure comprising a plurality of sense amplifiers, each including a local data latch, a pair of local busses connected to each of the data latches, a differential data bus, and a pair of redrivers connected between the pair of local busses and the differential data bus.
    Type: Application
    Filed: November 13, 2019
    Publication date: May 13, 2021
    Applicant: SanDisk Technologies LLC
    Inventors: Hiroki Yabe, Koichiro Hayashi, Takuya Ariki, Naoki Ookuma, Toru Miwa
  • Publication number: 20210134375
    Abstract: A non-volatile memory device comprising a memory cell region having a plurality of co-planar memory cell planes arranged in a plane parallel to a semiconductor substrate, with each memory cell plane comprising a plurality of sub-planes disposed adjacent one another along an axis that is parallel to the substrate. Further, each memory cell plane comprises a plurality of sense amplifier regions arranged along the axis in an alternating pattern with the sub-planes such that adjacent to each sub-plane is a sense amplifier region and each sense amplifier region is operable with respect to at least a fraction of the bit lines of the two sub-planes immediately adjacent the sense amplifier region.
    Type: Application
    Filed: October 30, 2019
    Publication date: May 6, 2021
    Applicant: SanDisk Technologies LLC
    Inventors: Hiroki Yabe, Koichiro Hayashi, Takuya Ariki, Yuki Fujita, Naoki Ookuma, Kazuki Yamauchi, Masahito Takehara, Toru Miwa
  • Publication number: 20210134828
    Abstract: A non-volatile memory apparatus is provided and includes a substrate having a major surface extending longitudinally. A stack of first and second sets of word lines and insulating layers extends along and over the major surface longitudinally and alternating with and overlying one another vertically to define a device region. The first and second sets of word lines each respectively extends longitudinally beyond a first and second side of the device region a decreasing longitudinal distance from the device region as a vertical distance from the major surface increases to define first and second stepped contact regions. Word line contacts extend vertically in the first and second stepped contact regions. The second set of word lines in the first stepped contact region do not contact the word line contacts and the first set of word lines in the second stepped contact region do not contact the word line contacts.
    Type: Application
    Filed: November 6, 2019
    Publication date: May 6, 2021
    Applicant: SanDisk Technologies LLC
    Inventors: Naoki Ookuma, Hiroki Yabe, Koichiro Hayashi, Takuya Ariki, Toru Miwa
  • Patent number: 10984874
    Abstract: A random access memory is provided including a plane structure comprising a plurality of sense amplifiers, each including a local data latch, a pair of local busses connected to each of the data latches, a differential data bus, and a pair of redrivers connected between the pair of local busses and the differential data bus.
    Type: Grant
    Filed: November 13, 2019
    Date of Patent: April 20, 2021
    Assignee: SanDisk Technologies LLC
    Inventors: Hiroki Yabe, Koichiro Hayashi, Takuya Ariki, Naoki Ookuma, Toru Miwa