Patents by Inventor Sheunghee Park

Sheunghee Park 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: 20170148525
    Abstract: The various implementations described herein include systems, methods and/or devices used to enable adaptive verify voltage adjustment in memory devices. The method includes: (1) in conjunction with decoding data read from non-volatile memory in the non-volatile memory system, determining a plurality of error parameters, (2) determining, in accordance with the plurality of error parameters, a verify adjustment signal, (3) determining whether a verify trigger event has occurred, (4) in accordance with a determination that a verify trigger event has occurred, adjusting a verify voltage in accordance with the verify adjustment signal, and (5) performing data write operations to write data to non-volatile memory in the non-volatile memory system using the adjusted verify voltage to verify the data written using the data write operations.
    Type: Application
    Filed: June 17, 2016
    Publication date: May 25, 2017
    Inventors: Gulzar Ahmed Kathawala, Yuan Zhang, Wenzhou Chen, Sheunghee Park
  • Patent number: 9543025
    Abstract: A storage control system, and a method of operation thereof, including: a power-down module for powering off a memory sub-system; a decay estimation module, coupled to the power-down module, for estimating a power-off decay rate upon the memory sub-system powered up, the power-off decay rate is for indicating how much data in the memory sub-system has decayed while the memory sub-system has been powered down; and a recycle module, coupled to the decay estimation module, for recycling an erase block for data retention based on the power-off decay rate.
    Type: Grant
    Filed: April 11, 2013
    Date of Patent: January 10, 2017
    Assignee: SANDISK TECHNOLOGIES LLC
    Inventors: James Fitzpatrick, James M. Higgins, Bernardo Rub, Ryan Jones, Robert W. Ellis, Mark Dancho, Sheunghee Park
  • Publication number: 20150046664
    Abstract: Systems, methods and/or devices are used to enable a settings adjustment mechanism. In one aspect, the method includes (1) accessing characterization information corresponding to how a group of non-volatile memory devices of a storage control system operates as the group wears, (2) determining an estimated age of a non-volatile memory device, of the group of non-volatile memory devices, in accordance with a wear indicator for the non-volatile memory device, and (3) determining one or more settings for the non-volatile memory device in accordance with the estimated age and the characterization information.
    Type: Application
    Filed: July 29, 2014
    Publication date: February 12, 2015
    Inventors: James Fitzpatrick, Sheunghee Park, Bernardo Rub, James M. Higgins
  • Publication number: 20140310445
    Abstract: A storage control system, and a method of operation thereof, including: a power-down module for powering off a memory sub-system; a decay estimation module, coupled to the power-down module, for estimating a power-off decay rate upon the memory sub-system powered up, the power-off decay rate is for indicating how much data in the memory sub-system has decayed while the memory sub-system has been powered down; and a recycle module, coupled to the decay estimation module, for recycling an erase block for data retention based on the power-off decay rate.
    Type: Application
    Filed: April 11, 2013
    Publication date: October 16, 2014
    Applicant: SMART Storage Systems, Inc.
    Inventors: James Fitzpatrick, James M. Higgins, Bernardo Rub, Ryan Jones, Robert W. Ellis, Mark Dancho, Sheunghee Park
  • Publication number: 20130282962
    Abstract: A storage control system and method of operation thereof includes: a memory circuit for accessing a configuration category; a configuration module, coupled to the memory circuit, for configuring the memory circuit with the configuration category; and an operation module, coupled to the configuration module, for controlling a performance characteristic of a memory device based on the configuration category.
    Type: Application
    Filed: April 19, 2013
    Publication date: October 24, 2013
    Applicant: SMART Storage Systems, Inc.
    Inventors: Bernardo Rub, James Fitzpatrick, Sheunghee Park, Yi-Ching Wu, Robert W. Ellis
  • Patent number: 7079424
    Abstract: A method is provided for erasing a memory cell having a substrate, a control gate, a floating gate, a source region and a drain region. The method includes pre-programming the memory cell to raise a threshold voltage of the memory cell to a first predetermined level, wherein pre-programming the memory cell does not include a verification process for ensuring that the threshold voltage of the memory cell has been raised to the first predetermined level. The memory cell may be erased to lower the threshold voltage of the memory cell to a second predetermined level.
    Type: Grant
    Filed: September 22, 2004
    Date of Patent: July 18, 2006
    Assignee: Spansion L.L.C.
    Inventors: Sungchul Lee, Sheunghee Park, Yue-Song He, Ming Sang Kwan
  • Patent number: 6996004
    Abstract: Multiple passes of the loop of program verify and programming steps are performed for minimizing the effects of FG—FG coupling during programming a flash memory device. In one embodiment of the present invention, for programming a group of at least one flash memory cell of an array, a first pass of program verify and programming steps is performed until each flash memory cell of the group attains a threshold voltage that is at least X % of a program verify level but less than the program verify level. Then, a second pass of program verify and programming steps are performed until each flash memory cell of the group attains substantially the program verify level for the threshold voltage.
    Type: Grant
    Filed: November 4, 2003
    Date of Patent: February 7, 2006
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Richard Fastow, Sheunghee Park
  • Patent number: 6894925
    Abstract: A flash memory cell programming system and method that facilitate efficient and quick operation of a flash memory cell by providing a biasable well (e.g., substrate) is presented. The biasable well flash memory cell enables increases in electrical field strengths in a manner that eases resistance to charge penetration of a dielectric barrier (e.g., oxide) around a charge trapping region (e.g., a floating gate). The present biasable well system and method also create a self convergence point that increase control during programming operations and reduces the chances of excessive correction for over erased memory cells. The biasing can assist hard programming to store information and/or soft programming to correct the effects of over-erasing. The biasing can also reduce stress on a drain voltage pump, reduce leakage current and reduce programming durations. Some implementations also include a biasable control gate component, biasable source component and biasable drain component.
    Type: Grant
    Filed: January 14, 2003
    Date of Patent: May 17, 2005
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Sheunghee Park, Sameer S. Haddad, Chi Chang, Richard M. Fastow, Ming Sang Kwan, Zhigang Wang
  • Patent number: 6747900
    Abstract: A memory circuit for programming a target cell is disclosed. According to one embodiment, the memory circuit comprises the target cell having a drain terminal connected to a bit line. A drain voltage is coupled to the bit line and supplies a voltage greater than a ground voltage, while a gate voltage is coupled to a gate terminal of the target cell and supplies a voltage greater the ground voltage. A source voltage is coupled to a source terminal of the target cell and supplies a voltage less than the ground voltage, and a substrate voltage is coupled to a substrate of the target cell and supplies a voltage less than the ground voltage.
    Type: Grant
    Filed: January 21, 2003
    Date of Patent: June 8, 2004
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Sheunghee Park, Ming Sang Kwan
  • Patent number: 6510085
    Abstract: Methods of programming and soft programming short channel NOR flash memory cells that reduce the programming currents and column leakages during both programming and soft programming while maintaining fast programming speeds. During programming, a voltage of between 7 and 10 volts is applied to the control gate, a voltage of between 4 and 6 volts; is applied to the drain, a voltage of between 0.5 and 2.0 volts is applied to the source and a voltage of between minus 2 and minus 0.5 volts is applied to the substrate of the selected cell to be programmed. During soft programming, a voltage of between 0.5 and 4.5 volts is applied to the control gates, between 4 and 5.5 volts is applied to the drains, between 0.5 and 2 volts is applied to the sources and between minus 2.0 and minus 0.5 volts is applied to the substrates of the memory cells.
    Type: Grant
    Filed: May 18, 2001
    Date of Patent: January 21, 2003
    Assignee: Advanced Micro Devices, Inc.
    Inventors: Richard Fastow, Sheunghee Park, Zhigang Wang, Sameer Haddad, Chi Chang