Patents by Inventor Karthikeyan Ramamurthi

Karthikeyan Ramamurthi 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).

  • Patent number: 11210025
    Abstract: Some embodiments include apparatuses and methods using memory cells and a control unit to suspend an erase operation performed on a first portion of the memory cells and to suspend a program operation performed on a second portion of the memory cells while the erase operation is suspended. The control unit includes register circuitry to store status information indicating that the program operation is suspended while the erase operation is suspended.
    Type: Grant
    Filed: December 23, 2019
    Date of Patent: December 28, 2021
    Assignee: Micron Technology, Inc.
    Inventors: Aliasgar S. Madraswala, Purval S. Sule, Karthikeyan Ramamurthi
  • Publication number: 20200133579
    Abstract: Some embodiments include apparatuses and methods using memory cells and a control unit to suspend an erase operation performed on a first portion of the memory cells and to suspend a program operation performed on a second portion of the memory cells while the erase operation is suspended. The control unit includes register circuitry to store status information indicating that the program operation is suspended while the erase operation is suspended.
    Type: Application
    Filed: December 23, 2019
    Publication date: April 30, 2020
    Inventors: Aliasgar S. Madraswala, Purval S. Sule, Karthikeyan Ramamurthi
  • Publication number: 20200090743
    Abstract: A system for facilitating multiple concurrent page reads in a memory array is provided. Memory cells that have multiple programming states (e.g., store multiple bits per cell) rely on various control gate and wordline voltages levels to read the memory cells. Therefore, to concurrently read multiple pages of memory cells, where each page includes one or more different programming levels, a memory controller includes first wordline control logic that includes a first voltage regulator and includes second wordline control logic that includes a second voltage regulator, according to one embodiment. The two voltage regulators enable the memory controller to concurrently address and access multiple pages of memory at different programming levels, in response to memory read requests, according to one embodiment.
    Type: Application
    Filed: October 4, 2019
    Publication date: March 19, 2020
    Inventors: Aliasgar S. MADRASWALA, Bharat M. PATHAK, Binh N. NGO, Naveen VITTAL PRABHU, Karthikeyan RAMAMURTHI, Pranav KALAVADE
  • Patent number: 10514862
    Abstract: Some embodiments include apparatuses and methods using memory cells and a control unit to suspend an erase operation performed on a first portion of the memory cells and to suspend a program operation performed on a second portion of the memory cells while the erase operation is suspended. The control unit includes register circuitry to store status information indicating that the program operation is suspended while the erase operation is suspended.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: December 24, 2019
    Assignee: Micron Technology, Inc.
    Inventors: Aliasgar S. Madraswala, Purval S. Sule, Karthikeyan Ramamurthi
  • Patent number: 10438656
    Abstract: A system for facilitating multiple concurrent page reads in a memory array is provided. Memory cells that have multiple programming states (e.g., store multiple bits per cell) rely on various control gate and wordline voltages levels to read the memory cells. Therefore, to concurrently read multiple pages of memory cells, where each page includes one or more different programming levels, a memory controller includes first wordline control logic that includes a first voltage regulator and includes second wordline control logic that includes a second voltage regulator, according to one embodiment. The two voltage regulators enable the memory controller to concurrently address and access multiple pages of memory at different programming levels, in response to memory read requests, according to one embodiment.
    Type: Grant
    Filed: December 18, 2017
    Date of Patent: October 8, 2019
    Assignee: Intel Corporation
    Inventors: Aliasgar S. Madraswala, Bharat M. Pathak, Binh N. Ngo, Naveen Vittal Prabhu, Karthikeyan Ramamurthi, Pranav Kalavade
  • Publication number: 20190043564
    Abstract: A system for facilitating multiple concurrent page reads in a memory array is provided. Memory cells that have multiple programming states (e.g., store multiple bits per cell) rely on various control gate and wordline voltages levels to read the memory cells. Therefore, to concurrently read multiple pages of memory cells, where each page includes one or more different programming levels, a memory controller includes first wordline control logic that includes a first voltage regulator and includes second wordline control logic that includes a second voltage regulator, according to one embodiment. The two voltage regulators enable the memory controller to concurrently address and access multiple pages of memory at different programming levels, in response to memory read requests, according to one embodiment.
    Type: Application
    Filed: December 18, 2017
    Publication date: February 7, 2019
    Applicant: Intel Corporation
    Inventors: ALIASGAR S. MADRASWALA, BHARAT M. PATHAK, BINH N. NGO, NAVEEN VITTAL PRABHU, KARTHIKEYAN RAMAMURTHI, PRANAV KALAVADE
  • Publication number: 20180024772
    Abstract: Some embodiments include apparatuses and methods using memory cells and a control unit to suspend an erase operation performed on a first portion of the memory cells and to suspend a program operation performed on a second portion of the memory cells while the erase operation is suspended. The control unit includes register circuitry to store status information indicating that the program operation is suspended while the erase operation is suspended.
    Type: Application
    Filed: July 21, 2016
    Publication date: January 25, 2018
    Inventors: Aliasgar S. Madraswala, Purval S. Sule, Karthikeyan Ramamurthi
  • Patent number: 8069403
    Abstract: A circuit is presented for determining whether or not to invert a bus, for example a data bus that is operable having multiple widths. The circuit includes comparison circuitry that can receive both the current and next values for the bus and individually compare the current and next values of the bits on the bus to determine whether these have changed. A voting circuit receives the result of these determinations and also receives an indication of width with which the bus is being operated. The voting circuit then determines a bus inversion values based upon whether the number of bits on the data that have changed exceed a value that depends upon the indication of bus width.
    Type: Grant
    Filed: July 1, 2008
    Date of Patent: November 29, 2011
    Assignee: SanDisk Technologies Inc.
    Inventors: Omprakash Bisen, Karthikeyan Ramamurthi, Hima Bindu
  • Publication number: 20100005373
    Abstract: A circuit is presented for determining whether or not to invert a bus, for example a data bus that is operable having multiple widths. The circuit includes comparison circuitry that can receive both the current and next values for the bus and individually compare the current and next values of the bits on the bus to determine whether these have changed. A voting circuit receives the result of these determinations and also receives an indication of width with which the bus is being operated. The voting circuit then determines a bus inversion values based upon whether the number of bits on the data that have changed exceed a value that depends upon the indication of bus width.
    Type: Application
    Filed: July 1, 2008
    Publication date: January 7, 2010
    Inventors: Omprakash Bisen, Karthikeyan Ramamurthi, Hima Bindu
  • Patent number: 7327605
    Abstract: An apparatus and technique for testing of multi-level cells (MLC) in a memory storage device using a high bandwidth data path architecture. The technique includes hardware for obtaining a first data and a second data from a multilevel cell memory. The first data is different from the second data. The first data and second data are compared and, based at least in part on this comparison, the multilevel cell memory is programmed. Programming the multilevel cell memory includes accessing memory cells in the multilevel cell memory and determining the number of bits per memory cell of the first data that need programming.
    Type: Grant
    Filed: December 28, 2006
    Date of Patent: February 5, 2008
    Assignee: Intel Corporation
    Inventors: Daniel R. Elmhurst, Karthikeyan Ramamurthi, Quan H. Ngo, Robert L. Melcher
  • Publication number: 20080008010
    Abstract: An apparatus and technique for testing of multi-level cells (MLC) in a memory storage device using a high bandwidth data path architecture. The technique includes hardware for obtaining a first data and a second data from a multilevel cell memory. The first data is different from the second data. The first data and second data are compared and, based at least in part on this comparison, the multilevel cell memory is programmed. Programming the multilevel cell memory includes accessing memory cells in the multilevel cell memory and determining the number of bits per memory cell of the first data that need programming.
    Type: Application
    Filed: December 28, 2006
    Publication date: January 10, 2008
    Inventors: Daniel Elmhurst, Karthikeyan Ramamurthi, Quan Ngo, Robert Melcher
  • Patent number: 7177186
    Abstract: An apparatus and technique for testing of multi-level cells (MLC) in a memory storage device using a high bandwidth data path architecture. The technique includes hardware for obtaining a first data and a second data from a multilevel cell memory. The first data is different from the second data. The first data and second data are compared and, based at least in part on this comparison, the multilevel cell memory is programmed. Programming the multilevel cell memory includes accessing memory cells in the multilevel cell memory and determining the number of bits per memory cell of the first data that need programming.
    Type: Grant
    Filed: March 28, 2006
    Date of Patent: February 13, 2007
    Assignee: Intel Corporation
    Inventors: Daniel R. Elmhurst, Karthikeyan Ramamurthi, Quan H. Ngo, Robert L. Melcher
  • Publication number: 20060193172
    Abstract: An apparatus and technique for testing of multi-level cells (MLC) in a memory storage device using a high bandwidth data path architecture. The technique includes hardware for obtaining a first data and a second data from a multilevel cell memory. The first data is different from the second data. The first data and second data are compared and, based at least in part on this comparison, the multilevel cell memory is programmed. Programming the multilevel cell memory includes accessing memory cells in the multilevel cell memory and determining the number of bits per memory cell of the first data that need programming.
    Type: Application
    Filed: March 28, 2006
    Publication date: August 31, 2006
    Inventors: Daniel Elmhurst, Karthikeyan Ramamurthi, Quan Ngo, Robert Melcher
  • Patent number: 7075822
    Abstract: An apparatus and technique for testing of multi-level cells (MLC) in a memory storage device using a high bandwidth data path architecture. The technique includes hardware for obtaining a first data and a second data from a multilevel cell memory. The first data is different from the second data. The first data and second data are compared and, based at least in part on this comparison, the multilevel cell memory is programmed. Programming the multilevel cell memory includes accessing memory cells in the multilevel cell memory and determining the number of bits per memory cell of the first data that need programming.
    Type: Grant
    Filed: December 31, 2002
    Date of Patent: July 11, 2006
    Assignee: Intel Corporation
    Inventors: Daniel R. Elmhurst, Karthikeyan Ramamurthi, Quan H. Ngo, Robert L. Melcher
  • Patent number: 7057934
    Abstract: A flash memory includes multi-level cells (MLC) that are programmed with a combination of coarse gate voltage steps and fine gate voltage steps. The multi-level cells include floating gate transistors that are programmed by modifying the threshold voltages of the floating gate transistors. Coarse gate voltage steps are used until the threshold voltage any of the transistors being programmed reaches a reference value, and fine steps are used thereafter.
    Type: Grant
    Filed: June 29, 2004
    Date of Patent: June 6, 2006
    Assignee: Intel Corporation
    Inventors: Sreeram Krishnamachari, Karthikeyan Ramamurthi
  • Publication number: 20050286304
    Abstract: A flash memory is programmed with a combination of coarse gate voltage steps and fine gate voltage steps.
    Type: Application
    Filed: June 29, 2004
    Publication date: December 29, 2005
    Inventors: Sreeram Krishnamachari, Karthikeyan Ramamurthi
  • Publication number: 20040128594
    Abstract: An apparatus and technique for testing of multi-level cells (MLC) in a memory storage device using a high bandwidth data path architecture. The technique includes hardware for obtaining a first data and a second data from a multilevel cell memory. The first data is different from the second data. The first data and second data are compared and, based at least in part on this comparison, the multilevel cell memory is programmed. Programming the multilevel cell memory includes accessing memory cells in the multilevel cell memory and determining the number of bits per memory cell of the first data that need programming.
    Type: Application
    Filed: December 31, 2002
    Publication date: July 1, 2004
    Inventors: Daniel R. Elmhurst, Karthikeyan Ramamurthi, Quan H. Ngo, Robert L. Melcher