Patents by Inventor Scott Rixner

Scott Rixner 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: 8984184
    Abstract: A method for communicating data between peripheral devices and an embedded processor that includes receiving, at a data buffer unit of the embedded processor, the data from a peripheral device. The method also includes copying data from the data buffer unit into the bridge buffer of the embedded processor as a bridge buffer message. Additionally, the method includes creating, after storing the data as a bridge buffer message, a peripheral device message comprising the bridge buffer message, and sending the peripheral device message to a thread message queue of a subscriber.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: March 17, 2015
    Assignee: William Marsh Rice University
    Inventors: Thomas William Barr, Scott Rixner
  • Publication number: 20140304440
    Abstract: A method for communicating data between peripheral devices and an embedded processor that includes receiving, at a data buffer unit of the embedded processor, the data from a peripheral device. The method also includes copying data from the data buffer unit into the bridge buffer of the embedded processor as a bridge buffer message. Additionally, the method includes creating, after storing the data as a bridge buffer message, a peripheral device message comprising the bridge buffer message, and sending the peripheral device message to a thread message queue of a subscriber.
    Type: Application
    Filed: April 4, 2014
    Publication date: October 9, 2014
    Applicant: WILLIAM MARSH RICE UNIVERSITY
    Inventors: Thomas William Barr, Scott Rixner
  • Patent number: 8761152
    Abstract: A computer readable medium comprising computer readable code for data transfer. The computer readable code, when executed, performs a method. The method includes receiving, at a first Axon, an ARP request from a source host directed to a target host. The method also includes obtaining a first route from the first Axon to the second Axon, and generating a target identification corresponding to the target host. The method further includes sending an Axon-ARP request to the second Axon using the first route, and receiving an Axon-ARP reply from the second Axon, where the Axon-ARP reply includes a second route. The method further includes storing the first route in storage space on the first Axon, where the storage space is indexed by the target identification, and sending an ARP reply to the first host where the source host is configured to send a packet to the target host.
    Type: Grant
    Filed: October 13, 2009
    Date of Patent: June 24, 2014
    Assignee: William Marsh Rice University
    Inventors: Scott Rixner, Alan L. Cox, Michael Foss, Jeffrey Shafer
  • Patent number: 7979666
    Abstract: A system and method for context-independent coding using frequency-based mapping schemes, sequence-based mapping schemes, memory trace-based mapping schemes, and/or transition statistics-based mapping schemes in order to reduce off-chip interconnect power consumption. State-of-the-art context-dependent, double-ended codes for processor-SDRAM off-chip interfaces require the transmitter and receiver (memory controller and SDRAM) to collaborate using the current and previously transmitted values to encode and decode data. In contrast, the memory controller can use a context-independent code to encode data stored in SDRAM and subsequently decode that data when it is retrieved, allowing the use of commodity memories. A single-ended, context-independent code is realized by assigning limited-weight codes using a frequency-based mapping technique. Experimental results show that such a code can reduce the power consumption of an uncoded off-chip interconnect by an average of 30% with less than a 0.
    Type: Grant
    Filed: December 8, 2007
    Date of Patent: July 12, 2011
    Assignee: William Marsh Rice University
    Inventors: Scott Rixner, Kartik Mohanram, Mihir R. Choudhury
  • Patent number: 7818539
    Abstract: A processor implements conditional vector operations in which, for example, an input vector containing multiple operands to be used in conditional operations is divided into two or more output vectors based on a condition vector. Each output vector can then be processed at full processor efficiency without cycles wasted due to branch latency. Data to be processed are divided into two groups based on whether or not they satisfy a given condition by e.g., steering each to one of the two index vectors. Once the data have been segregated in this way, subsequent processing can be performed without conditional operations, processor cycles wasted due to branch latency, incorrect speculation or execution of unnecessary instructions due to predication. Other examples of conditional operations include combining one or more input vectors into a single output vector based on a condition vector, conditional vector switching, conditional vector combining, and conditional vector load balancing.
    Type: Grant
    Filed: August 28, 2006
    Date of Patent: October 19, 2010
    Assignees: The Board of Trustees of the Leland Stanford Junior University, The Massachusetts Institute of Technology
    Inventors: Scott Rixner, John D. Owens, Ujval J. Kapasi, William J. Dally
  • Publication number: 20100095020
    Abstract: A computer readable medium comprising computer readable code for data transfer. The computer readable code, when executed, performs a method. The method includes receiving, at a first Axon, an ARP request from a source host directed to a target host. The method also includes obtaining a first route from the first Axon to the second Axon, and generating a target identification corresponding to the target host. The method further includes sending an Axon-ARP request to the second Axon using the first route, and receiving an Axon-ARP reply from the second Axon, where the Axon-ARP reply includes a second route. The method further includes storing the first route in storage space on the first Axon, where the storage space is indexed by the target identification, and sending an ARP reply to the first host where the source host is configured to send a packet to the target host.
    Type: Application
    Filed: October 13, 2009
    Publication date: April 15, 2010
    Applicant: WILLIAM MARSH RICE UNIVERSITY
    Inventors: Scott Rixner, Alan L. Cox, Michael Foss, Jeffrey Shafer
  • Publication number: 20080140987
    Abstract: A system and method for context-independent coding using frequency-based mapping schemes, sequence-based mapping schemes, memory trace-based mapping schemes, and/or transition statistics-based mapping schemes in order to reduce off-chip interconnect power consumption. State-of-the-art context-dependent, double-ended codes for processor-SDRAM off-chip interfaces require the transmitter and receiver (memory controller and SDRAM) to collaborate using the current and previously transmitted values to encode and decode data. In contrast, the memory controller can use a context-independent code to encode data stored in SDRAM and subsequently decode that data when it is retrieved, allowing the use of commodity memories. A single-ended, context-independent code is realized by assigning limited-weight codes using a frequency-based mapping technique. Experimental results show that such a code can reduce the power consumption of an uncoded off-chip interconnect by an average of 30% with less than a 0.
    Type: Application
    Filed: December 8, 2007
    Publication date: June 12, 2008
    Inventors: Scott Rixner, Kartik Mohanram, Mihir R. Choudhury
  • Publication number: 20070150700
    Abstract: A processor implements conditional vector operations in which, for example, an input vector containing multiple operands to be used in conditional operations is divided into two or more output vectors based on a condition vector. Each output vector can then be processed at full processor efficiency without cycles wasted due to branch latency. Data to be processed are divided into two groups based on whether or not they satisfy a given condition by e.g., steering each to one of the two index vectors. Once the data have been segregated in this way, subsequent processing can be performed without conditional operations, processor cycles wasted due to branch latency, incorrect speculation or execution of unnecessary instructions due to predication. Other examples of conditional operations include combining one or more input vectors into a single output vector based on a condition vector, conditional vector switching, conditional vector combining, and conditional vector load balancing.
    Type: Application
    Filed: August 28, 2006
    Publication date: June 28, 2007
    Applicants: The Board of Trustees of the Leland Stanford Junior University, The Massachusetts Institute of Technology
    Inventors: William Dally, Scott Rixner, John Owens, Ujval Kapasi
  • Publication number: 20060215481
    Abstract: A memory processing approach involves implementation of memory status-driven access. According to an example embodiment, addresses received at an address buffer are processed for access to a memory relative to an active location in the memory. Addresses corresponding to an active location in the memory array are processed prior to addresses that do not correspond to an active location. Data is read from the memory to a read buffer and ordered in a manner commensurate with the order of received addresses at the address buffer (e.g., thus facilitating access to the memory in an order different from that received at the address buffer while maintaining the order from the read buffer).
    Type: Application
    Filed: May 15, 2006
    Publication date: September 28, 2006
    Inventors: William Dally, Scott Rixner
  • Patent number: 7100026
    Abstract: A processor implements conditional vector operations in which, for example, an input vector containing multiple operands to be used in conditional operations is divided into two or more output vectors based on a condition vector. Each output vector can then be processed at full processor efficiency without cycles wasted due to branch latency. Data to be processed are divided into two groups based on whether or not they satisfy a given condition by, e.g., steering each to one of two index vectors. Once the data have been segregated in this way, subsequent processing can be performed without conditional operations, processor cycles wasted due to branch latency, incorrect speculation or execution of unnecessary instructions due to predication. Other examples of conditional operations include combining one or more input vectors into a single output vector based on a condition vector, conditional vector switching, conditional vector combining, and conditional vector load balancing.
    Type: Grant
    Filed: May 30, 2001
    Date of Patent: August 29, 2006
    Assignees: The Massachusetts Institute of Technology, The Board of Trustees of the Leland Stanford Junior University
    Inventors: William J. Dally, Scott Rixner, John D. Owens, Ujval J. Kapasi
  • Publication number: 20050105381
    Abstract: A memory processing approach involves implementation of memory status-driven access. According to an example embodiment, addresses received at an address buffer are processed for access to a memory relative to an active location in the memory. Addresses corresponding to an active location in the memory array are processed prior to addresses that do not correspond to an active location. Data is read from the memory to a read buffer and ordered in a manner commensurate with the order of received addresses at the address buffer (e.g., thus facilitating access to the memory in an order different from that received at the address buffer while maintaining the order from the read buffer).
    Type: Application
    Filed: December 21, 2004
    Publication date: May 19, 2005
    Applicants: The Massachusetts Institute of Technology University, The Board of Trustees of the Leland Stanford Junior University
    Inventors: William Dally, Scott Rixner
  • Publication number: 20030070059
    Abstract: A processor implements conditional vector operations in which, for example, an input vector containing multiple operands to be used in conditional operations is divided into two or more output vectors based on a condition vector. Each output vector can then be processed at full processor efficiency without cycles wasted due to branch latency. Data to be processed are divided into two groups based on whether or not they satisfy a given condition by, e.g., steering each to one of two index vectors. Once the data have been segregated in this way, subsequent processing can be performed without conditional operations, processor cycles wasted due to branch latency, incorrect speculation or execution of unnecessary instructions due to predication. Other examples of conditional operations include combining one or more input vectors into a single output vector based on a condition vector, conditional vector switching, conditional vector combining, and conditional vector load balancing.
    Type: Application
    Filed: May 30, 2001
    Publication date: April 10, 2003
    Inventors: William J. Dally, Scott Rixner, John Owens, Ujval J. Kapasi