Patents by Inventor Devadas Varma

Devadas Varma 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: 9846660
    Abstract: An integrated circuit (IC) includes a first region being static and providing an interface between the IC and a host processor. The first region includes a first interconnect circuit block having a first master interface and a second interconnect circuit block having a first slave interface. The IC includes a second region coupled to the first region. The second region implements a kernel of a heterogeneous, multiprocessor design and includes a slave interface coupled to the first master interface of the first interconnect circuit block and configured to receive commands from the host processor. The second region also includes a master interface coupled the first slave interface of the second interconnect circuit block, wherein the master interface of the second region is a master for a memory controller.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: December 19, 2017
    Assignee: XILINX, INC.
    Inventors: Henry E. Styles, Jeffrey M. Fifield, Ralph D. Wittig, Philip B. James-Roxby, Sonal Santan, Devadas Varma, Fernando J. Martinez Vallina, Sheng Zhou, Charles Kwok-Wah Lo
  • Publication number: 20160132441
    Abstract: An integrated circuit (IC) includes a first region being static and providing an interface between the IC and a host processor. The first region includes a first interconnect circuit block having a first master interface and a second interconnect circuit block having a first slave interface. The IC includes a second region coupled to the first region. The second region implements a kernel of a heterogeneous, multiprocessor design and includes a slave interface coupled to the first master interface of the first interconnect circuit block and configured to receive commands from the host processor. The second region also includes a master interface coupled the first slave interface of the second interconnect circuit block, wherein the master interface of the second region is a master for a memory controller.
    Type: Application
    Filed: November 12, 2014
    Publication date: May 12, 2016
    Inventors: Henry E. Styles, Jeffrey M. Fifield, Ralph D. Wittig, Philip B. James-Roxby, Sonal Santan, Devadas Varma, Fernando J. Martinez Vallina, Sheng Zhou, Charles Kwok-Wah Lo
  • Patent number: 9218443
    Abstract: OpenCL program compilation may include generating, using a processor, a register transfer level (RTL) description of a first kernel of a heterogeneous, multiprocessor design and integrating the RTL description of the first kernel with a base platform circuit design. The base platform circuit design provides a static interface within a programmable integrated circuit to a host of the heterogeneous, multiprocessor design. A first configuration bitstream may be generated from the RTL description of the first kernel using the processor. The first configuration bitstream specifies a hardware implementation of the first kernel and supporting data for the configuration bitstream. The first configuration bitstream and the supporting data may be included within a binary container.
    Type: Grant
    Filed: November 12, 2014
    Date of Patent: December 22, 2015
    Assignee: XILINX, INC.
    Inventors: Henry E. Styles, Jeffrey M. Fifield, Ralph D. Wittig, Philip B. James-Roxby, Sonal Santan, Devadas Varma, Fernando J. Martinez Vallina, Sheng Zhou, Charles Kwah-Wah Lo
  • Patent number: 6672776
    Abstract: Provided are a method, article of manufacture, and apparatus for estimating delays of networks. An automated design system comprises a computer configured to identify a critical path in a network, calculate a delay for the technology-mapped version of the network, calculate a delay for the technology-independent version of the network, calculate a scale factor from the technology-mapped and technology-independent delays, and apply the scale factor to all the delays in the technology-independent network.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: January 6, 2004
    Assignee: Cadence Design Systems
    Inventors: Johnson Chan Limqueco, Hong Li, Krishna Belkhale, Devadas Varma
  • Patent number: 6543037
    Abstract: Provided are a method, article of manufacture, and apparatus for estimating delays of networks. An automated design system comprises a computer configured to identify a critical path in a network, calculate a delay for the technology-mapped version of the network, calculate a delay for the technology-independent version of the network, calculate a scale factor from the technology-mapped and technology-independent delays, and apply the scale factor to all the delays in the technology-independent network.
    Type: Grant
    Filed: December 16, 1999
    Date of Patent: April 1, 2003
    Assignee: Cadence Design Systems, Inc.
    Inventors: Johnson Chan Limqueco, Hong Li, Krishna Belkhale, Devadas Varma
  • Patent number: 6023566
    Abstract: Provided are a method, article of manufacture, and apparatus for matching candidate clusters to cells in a technology library. An automated design system comprises a computer configured to use second order signatures in generating candidate permutations of each permutation group in a canonical form of the candidate function. The system selects first and second symmetric subgroups, determines a second order signature for the candidate function and the first and second symmetric subgroups, and compares the second order signature to a corresponding second order signature for a library cell function. If the signatures match, the permutation is continued with the first and second symmetric subgroups being included in an intermediate permutation. If not, the system produces no more intermediate permutations beginning with the first and second symmetric subgroups. Further symmetric subgroups are added to the intermediate permutation.
    Type: Grant
    Filed: April 14, 1997
    Date of Patent: February 8, 2000
    Assignee: Cadence Design Systems
    Inventors: Krishna Belkhale, Sumit Roy, Devadas Varma
  • Patent number: 5991524
    Abstract: Provided are a method, article of manufacture, and apparatus for identifying candidate clusters for matching to cells in a technology library. An automated design system comprises a computer configured to extract a portion of a circuit, levelize it, select a first node, identify the realizable clusters at the inputs of the first node, and combine the first node with realizable clusters at the inputs to produce candidate clusters. A dummy cluster is used at each input to represent using the input as a fanin. The system takes the cross product of the sets, and the first node is merged with each element of the cross product to produce a set of candidate clusters. The candidate clusters are then checked for realizability by comparing them to cells in the technology library, which includes dummy cells to facilitate mapping to large cells in the technology library. A set of realizable clusters is produced for the first node.
    Type: Grant
    Filed: April 14, 1997
    Date of Patent: November 23, 1999
    Assignee: Cadence Design Systems
    Inventors: Krishna Belkhale, Sumit Roy, Devadas Varma