Patents by Inventor Alon Eyal
Alon Eyal 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).
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Patent number: 11194523Abstract: A data storage device includes a non-volatile memory and a controller coupled to the non-volatile memory. The controller is operable to measure a first threshold voltage (VT) of a memory cell under a first parameter at a read temperature and measure a second VT of the memory cell under a second parameter at the read temperature in which the first parameter is different from the second parameter. A VT correction term for the memory cell is determined based upon the first VT measurement and the second VT measurement. A read VT of the memory cell is adjusted by using the VT correction term.Type: GrantFiled: January 24, 2020Date of Patent: December 7, 2021Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Stella Achtenberg, Eran Sharon, David Rozman, Alon Eyal, Idan Alrod, Dana Lee
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Patent number: 11043266Abstract: Technology is disclosed herein for operating a non-volatile memory system following a heating event such as an Infrared (IR) reflow process. The memory system is pre-loaded with data that is stored at multiple bits per memory cell. After the heating event, the memory system calibrates the read reference levels for reading the memory cells at multiple bits per memory cell. However, prior to calibrating the read reference levels, the memory system stabilizes one or more conditions in the memory system, which allows the new read reference levels to be accurately calibrated. The memory system may stabilizes threshold voltage of memory cells and/or word line voltages, for example. In one aspect, a dummy read is performed to stabilize one or more conditions of the memory system. Hence, the read reference levels may be accurately calibrated.Type: GrantFiled: June 15, 2020Date of Patent: June 22, 2021Assignee: Western Digital Technologies, Inc.Inventors: Hadar Tagar, Alon Eyal, David Rozman
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Publication number: 20200159465Abstract: A data storage device includes a non-volatile memory and a controller coupled to the non-volatile memory. The controller is operable to measure a first threshold voltage (Vt) of a memory cell under a first parameter at a read temperature and measure a second Vt of the memory cell under a second parameter at the read temperature in which the first parameter is different from the second parameter. A Vt correction term for the memory cell is determined based upon the first Vt measurement and the second Vt measurement. A read Vt of the memory cell is adjusted by using the Vt correction term.Type: ApplicationFiled: January 24, 2020Publication date: May 21, 2020Inventors: Stella ACHTENBERG, Eran SHARON, David ROZMAN, Alon EYAL, Idan ALROD, Dana LEE
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Patent number: 10564900Abstract: A data storage device includes a non-volatile memory and a controller coupled to the non-volatile memory. The controller is operable to measure a first threshold voltage (Vt) of a memory cell under a first parameter at a read temperature and measure a second Vt of the memory cell under a second parameter at the read temperature in which the first parameter is different from the second parameter. A Vt correction term for the memory cell is determined based upon the first Vt measurement and the second Vt measurement. A read Vt of the memory cell is adjusted by using the Vt correction term.Type: GrantFiled: June 11, 2018Date of Patent: February 18, 2020Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Stella Achtenberg, Eran Sharon, David Rozman, Alon Eyal, Idan Alrod, Dana Lee
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Patent number: 10446242Abstract: A device includes a memory and a controller coupled to the memory. The controller is configured to determine a temperature-based value of a search parameter in response to detecting that an error rate of a codeword read from the memory exceeds a threshold error rate. The controller is further configured to iteratively modify one or more memory access parameters associated with reducing temperature-dependent threshold voltage variation and to re-read the codeword using the modified one or more memory access parameters.Type: GrantFiled: June 9, 2017Date of Patent: October 15, 2019Assignee: WESTERN DIGITAL TECHNOLOGIES, INC.Inventors: Stella Achtenberg, Eran Sharon, David Rozman, Alon Eyal, Idan Alrod, Dana Lee
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Patent number: 10394649Abstract: Techniques are provided for improving the accuracy of read operations of memory cells, where the threshold voltage of a memory cell can shift depending on when the read operation occurs. A memory cell is sensed by discharging a sense node into a bit line and detecting an amount of discharge at two sense times relative to a trip voltage. A bit of data is stored in first and second latches based on the two sense times, to provide first and second pages of data. The pages are evaluated using parity check equations and one of the pages which satisfies the most equations is selected. In another option, word line voltages are grounded and then floated to prevent coupling up of the word line. A weak pulldown to ground can gradually discharge a coupled up voltage of the word lines.Type: GrantFiled: March 14, 2018Date of Patent: August 27, 2019Assignee: SanDisk Technologies LLCInventors: Idan Alrod, Eran Sharon, Alon Eyal, Liang Pang, Evgeny Mekhanik
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Patent number: 10372536Abstract: Techniques are provided for improving the accuracy of read operations of memory cells, where the threshold voltage of a memory cell can shift depending on when the read operation occurs. A memory cell is sensed by discharging a sense node into a bit line and detecting an amount of discharge at two sense times relative to a trip voltage. A bit of data is stored in first and second latches based on the two sense times, to provide first and second pages of data. The pages are evaluated using parity check equations and one of the pages which satisfies the most equations is selected. In another option, word line voltages are grounded and then floated to prevent coupling up of the word line. A weak pulldown to ground can gradually discharge a coupled up voltage of the word lines.Type: GrantFiled: March 14, 2018Date of Patent: August 6, 2019Assignee: SanDisk Technologies LLCInventors: Idan Alrod, Eran Sharon, Alon Eyal, Liang Pang, Evgeny Mekhanik
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Patent number: 10262743Abstract: Techniques are provided for improving the accuracy of read operations of memory cells, where the threshold voltage of a memory cell can shift depending on when the read operation occurs. A command is issued for performing a conditioning operation which helps to transition the memory cells so that their threshold voltages are at predictable levels. In one approach, the conditioning operation is performed by applying a voltage pulse to one or more word lines in response to a trigger, such as detecting that a duration since a last sensing operation exceeds a threshold, detecting that a duration since a last performance of the conditioning operation exceeds a threshold, or a detecting that a read command has been issued. Moreover, the peak power consumption required to perform the conditioning operation can be reduced for various configurations of a memory device on one or more die.Type: GrantFiled: February 23, 2017Date of Patent: April 16, 2019Assignee: SanDisk Technologies LLCInventors: Idan Alrod, Eran Sharon, Alon Eyal, Liang Pang, Evgeny Mekhanik
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Publication number: 20180293029Abstract: A data storage device includes a non-volatile memory and a controller coupled to the non-volatile memory. The controller is operable to measure a first threshold voltage (Vt) of a memory cell under a first parameter at a read temperature and measure a second Vt of the memory cell under a second parameter at the read temperature in which the first parameter is different from the second parameter. A Vt correction term for the memory cell is determined based upon the first Vt measurement and the second Vt measurement. A read Vt of the memory cell is adjusted by using the Vt correction term.Type: ApplicationFiled: June 11, 2018Publication date: October 11, 2018Inventors: Stella Achtenberg, Eran Sharon, David Rozman, Alon Eyal, Idan Alrod, Dana Lee
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Patent number: 10090044Abstract: A memory system can program data in different modes, such as normal mode programming and burst mode programming. Burst mode programming programs data into the memory device faster than normal mode programming. MLC Blocks for burst mode programming are selected based on one or more criteria, such as block age, block programming speed, or the like. Further, one or more burst mode TRIM settings, which include one or more of a program voltage TRIM setting, a step-up voltage TRIM setting, skip verify level, and a program pulse width, are used to program the blocks selected for burst mode programming. In this regard, burst mode programming is performed more quickly than normal mode programming.Type: GrantFiled: July 21, 2016Date of Patent: October 2, 2018Assignee: SanDisk Technologies LLCInventors: Stella Achtenberg, Alon Eyal, Eran Sharon
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Publication number: 20180203763Abstract: Techniques are provided for improving the accuracy of read operations of memory cells, where the threshold voltage of a memory cell can shift depending on when the read operation occurs. A memory cell is sensed by discharging a sense node into a bit line and detecting an amount of discharge at two sense times relative to a trip voltage. A bit of data is stored in first and second latches based on the two sense times, to provide first and second pages of data. The pages are evaluated using parity check equations and one of the pages which satisfies the most equations is selected. In another option, word line voltages are grounded and then floated to prevent coupling up of the word line. A weak pulldown to ground can gradually discharge a coupled up voltage of the word lines.Type: ApplicationFiled: March 14, 2018Publication date: July 19, 2018Applicant: SanDisk Technologies LLCInventors: Idan Alrod, Eran Sharon, Alon Eyal, Liang Pang, Evgeny Mekhanik
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Publication number: 20180203762Abstract: Techniques are provided for improving the accuracy of read operations of memory cells, where the threshold voltage of a memory cell can shift depending on when the read operation occurs. A memory cell is sensed by discharging a sense node into a bit line and detecting an amount of discharge at two sense times relative to a trip voltage. A bit of data is stored in first and second latches based on the two sense times, to provide first and second pages of data. The pages are evaluated using parity check equations and one of the pages which satisfies the most equations is selected. In another option, word line voltages are grounded and then floated to prevent coupling up of the word line. A weak pulldown to ground can gradually discharge a coupled up voltage of the word lines.Type: ApplicationFiled: March 14, 2018Publication date: July 19, 2018Applicant: SanDisk Technologies LLCInventors: Idan Alrod, Eran Sharon, Alon Eyal, Liang Pang, Evgeny Mekhanik
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Publication number: 20180114580Abstract: Techniques are provided for improving the accuracy of read operations of memory cells, where the threshold voltage of a memory cell can shift depending on when the read operation occurs. A command is issued for performing a conditioning operation which helps to transition the memory cells so that their threshold voltages are at predictable levels. In one approach, the conditioning operation is performed by applying a voltage pulse to one or more word lines in response to a trigger, such as detecting that a duration since a last sensing operation exceeds a threshold, detecting that a duration since a last performance of the conditioning operation exceeds a threshold, or a detecting that a read command has been issued. Moreover, the peak power consumption required to perform the conditioning operation can be reduced for various configurations of a memory device on one or more die.Type: ApplicationFiled: February 23, 2017Publication date: April 26, 2018Applicant: SanDisk Technologies LLCInventors: Idan Alrod, Eran Sharon, Alon Eyal, Liang Pang, Evgeny Mekhanik
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Publication number: 20180113759Abstract: Techniques are provided for improving the accuracy of read operations of memory cells, where the threshold voltage of a memory cell can shift depending on when the read operation occurs. A memory cell is sensed by discharging a sense node into a bit line and detecting an amount of discharge at two sense times relative to a trip voltage. A bit of data is stored in first and second latches based on the two sense times, to provide first and second pages of data. The pages are evaluated using parity check equations and one of the pages which satisfies the most equations is selected. In another option, word line voltages are grounded and then floated to prevent coupling up of the word line. A weak pulldown to ground can gradually discharge a coupled up voltage of the word lines.Type: ApplicationFiled: October 25, 2016Publication date: April 26, 2018Applicant: SanDisk Technologies LLCInventors: Idan Alrod, Eran Sharon, Alon Eyal, Liang Pang, Evgeny Mekhanik
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Patent number: 9952944Abstract: Techniques are provided for improving the accuracy of read operations of memory cells, where the threshold voltage of a memory cell can shift depending on when the read operation occurs. A memory cell is sensed by discharging a sense node into a bit line and detecting an amount of discharge at two sense times relative to a trip voltage. A bit of data is stored in first and second latches based on the two sense times, to provide first and second pages of data. The pages are evaluated using parity check equations and one of the pages which satisfies the most equations is selected. In another option, word line voltages are grounded and then floated to prevent coupling up of the word line. A weak pulldown to ground can gradually discharge a coupled up voltage of the word lines.Type: GrantFiled: October 25, 2016Date of Patent: April 24, 2018Assignee: SanDisk Technologies LLCInventors: Idan Alrod, Eran Sharon, Alon Eyal, Liang Pang, Evgeny Mekhanik
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Patent number: 9947401Abstract: Technology is described for keeping current (e.g., peak power supply current or ICC) in a non-volatile memory system within a target while maintaining high throughput. Programming conditions are adaptively changed at the sub-codeword level in order to keep power supply current of the memory system within a target. In one embodiment, a chunk of data that corresponds to a sub-codeword is written while consuming lower than normal programming current in order to keep power supply current within a target. The relatively low programming current may increase the expected raw BER. However, other portions of the codeword can be written with a higher than normal programming current, which results in a lower expected bit raw error rate for the memory cells that store that portion.Type: GrantFiled: December 22, 2016Date of Patent: April 17, 2018Assignee: SanDisk Technologies LLCInventors: Ariel Navon, Tz-Yi Liu, Eran Sharon, Alexander Bazarsky, Judah Hahn, Alon Eyal, Omer Fainzilber
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Publication number: 20180025776Abstract: Apparatus and method for performing burst mode programming in a memory system are disclosed. A memory system may program data in different modes, such as normal mode programming and burst mode programming. Burst mode programming programs data into the memory device faster than normal mode programming. MLC Blocks for burst mode programming may be selected based on one or more criteria, such as block age, block programming speed, or the like. Further, one or more burst mode TRIM settings, which may include a program voltage TRIM setting, a step-up voltage TRIM setting, skip verify level, and a program pulse width, may be used to program the blocks selected for burst mode programming. In this regard, burst mode programming may be performed more quickly than normal mode programming.Type: ApplicationFiled: July 21, 2016Publication date: January 25, 2018Applicant: SanDisk Technologies LLCInventors: Stella Achtenberg, Alon Eyal, Eran Sharon
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Patent number: 9865360Abstract: A method performed by a controller includes initiating a first data write operation and an erase operation on a portion of a non-volatile memory. The first data write operation corresponds to a first write resolution. The method includes initiating a second data write operation to write test data to the portion of the non-volatile memory. The second data write operation corresponds to a second write resolution that is greater than the first write resolution. The method also includes reading a representation of the test data from the portion of the non-volatile memory.Type: GrantFiled: October 22, 2015Date of Patent: January 9, 2018Assignee: SanDisk Technologies LLCInventors: Eran Sharon, Alexander Bazarsky, Ariel Navon, Alon Eyal, Idan Alrod, Ofer Shapira
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Publication number: 20170345510Abstract: A device includes a memory and a controller coupled to the memory. The controller is configured to determine a temperature-based value of a search parameter in response to detecting that an error rate of a codeword read from the memory exceeds a threshold error rate. The controller is further configured to iteratively modify one or more memory access parameters associated with reducing temperature-dependent threshold voltage variation and to re-read the codeword using the modified one or more memory access parameters.Type: ApplicationFiled: June 9, 2017Publication date: November 30, 2017Inventors: Stella Achtenberg, Eran Sharon, David Rozman, Alon Eyal, Idan Alrod, Dana Lee
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Patent number: 9704595Abstract: Techniques are provided for non-volatile storage self-detecting that a heating event has occurred to the non-volatile storage. One example of the heating event is an Infrared (IR) reflow process. In one aspect, a block of memory cells in a memory device are put through a number of program/erase cycles. A group of the memory cells in the cycled block are programmed to a reference threshold voltage distribution. Some time may pass after programming the cycled block. The memory device self-detects that there has been a heating event in response to a shift in the reference VT distribution being more than an allowed amount. The memory device may switch from a first programming mode to a second programming mode in response to detecting that the heating event has occurred.Type: GrantFiled: March 31, 2016Date of Patent: July 11, 2017Assignee: SanDisk Technologies LLCInventors: Alon Eyal, Idan Alrod, Eran Sharon, Ishai Ilani, Mark Murin, David Rozman, Wei-Cheng Lien, Deepanshu Dutta, Changyuan Chen