Patents by Inventor Stephen M. Trimberger

Stephen M. Trimberger 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: 9483416
    Abstract: A method of processor operation using an integrated circuit (IC) can include loading encrypted program code into the IC through a configuration port of the IC and decrypting the encrypted program code using configuration circuitry of the IC. Decryption of the encrypted program code can result in decrypted program code which can be provided to a target destination.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: November 1, 2016
    Assignee: XILINX, INC.
    Inventors: Ting Lu, Stephen M. Trimberger, Eric E. Edwards, Weiguang Lu, Kam-Wing Li
  • Patent number: 9444618
    Abstract: Circuits and methods are disclosed for defending against attacks on ring oscillator-based physically unclonable functions (RO PUFs). A control circuit that is coupled to the RO PUF is configured to detect out-of-tolerance operation of the RO PUF. In response to detecting out-of-tolerance operation of the RO PUF, the control circuit disables the RO PUF, and in response to detecting in-tolerance operation, the control circuit enables the RO PUF.
    Type: Grant
    Filed: April 22, 2013
    Date of Patent: September 13, 2016
    Assignee: XILINX, INC.
    Inventors: Stephen M. Trimberger, Austin H Lesea
  • Patent number: 9432121
    Abstract: Various apparatuses, circuits, systems, and methods for optical communication are disclosed. In some implementations, an apparatus includes a package substrate and f first interposer mounted on the package substrate. The apparatus also includes a logic circuit and an optical interface circuit connected to the logic circuit via the first interposer. One of the optical interface circuit or the logic circuit is mounted on the first interposer. The optical interface circuit includes a driver circuit configured to receive electronic data signals from the logic circuit. The optical interface circuit also includes an optical transmitter circuit coupled to the driver circuit and configured to output optical data signals encoding the electronic data signals.
    Type: Grant
    Filed: June 5, 2014
    Date of Patent: August 30, 2016
    Assignee: XILINX, INC.
    Inventors: Austin H. Lesea, Stephen M. Trimberger
  • Patent number: 9372956
    Abstract: A method of enabling the use of a programmable device having impaired circuitry includes determining one or more locations of the impaired circuitry of the programmable device; generating a defect map for the programmable device based on the determined locations of the impaired circuitry; generating a plurality of configuration bitstreams to implement a circuit in the programmable device; selecting one of the plurality of configuration bitstreams that does not use the impaired circuitry indicated by the defect map; and programming the programmable device with the selected configuration bitstream.
    Type: Grant
    Filed: November 10, 2014
    Date of Patent: June 21, 2016
    Assignee: XILINX, INC.
    Inventors: Yuezhen Fan, Eric J. Thorne, Xiao-Yu Li, Glenn O'Rourke, Stephen M. Trimberger
  • Patent number: 9270469
    Abstract: One approach for authenticating data includes storing a plurality of combinations of representations of public keys and session key IDs in a non-volatile memory. A payload and accompanying public key, session key ID, and signature of the payload are input. The signature is a function of the payload and a private key of a key pair that includes the accompanying public key and the private key. Authenticity of the payload is determined based on the accompanying public key and session key ID and the combinations stored in the non-volatile memory, and from the signature and the payload. In response to determining that the payload is authentic, the payload is processed, and in response to determining that the payload is not authentic, processing of the payload is disabled.
    Type: Grant
    Filed: February 20, 2014
    Date of Patent: February 23, 2016
    Assignee: XILINX, INC.
    Inventors: Jason J. Moore, Steven E. McNeil, Stephen M. Trimberger
  • Publication number: 20160050017
    Abstract: In an adaptation module relating generally to adaptive optical channel compensation, an analysis module is coupled to receive a first data signal and a second data signal and coupled to provide first information and second information. A comparison module is coupled to compare the first information and the second information to provide third information. An adjustment module is coupled to receive the third information to provide fourth information to compensate for distortion in the second data signal with reference to the first data signal. The second data signal is associated with a conversion of the first data signal to an optical signal for communication via an optical channel.
    Type: Application
    Filed: August 13, 2014
    Publication date: February 18, 2016
    Applicant: Xilinx, Inc.
    Inventors: Austin H. Lesea, Stephen M. Trimberger
  • Patent number: 9225512
    Abstract: Approaches for using a physically unclonable function (PUF) as a key-encrypting key are disclosed. Data is encrypted using a session key, and at least one PUF value is generated from a PUF. The session key and a correctness indicator are encrypted into a corresponding session key pair using the PUF value. Each session key pair is added to the encrypted data. Subsequent decryption, using a subsequently generated PUF value, of the correctness indicator to an expected value indicates a valid decryption. Decryption may be repeated using a different PUF value if the correctness indicator does not match the expected value. In another approach, the session key may be omitted and the payload data may be encrypted with the different PUF values and paired with correctness indicators.
    Type: Grant
    Filed: May 1, 2013
    Date of Patent: December 29, 2015
    Assignee: XILINX, INC.
    Inventor: Stephen M. Trimberger
  • Patent number: 9213835
    Abstract: In one embodiment of the present invention, a secure cryptographic circuit arrangement is provided. The secure cryptographic circuit includes a cryptographic processing block, a spreading sequence generator, and a delay control circuit. The cryptographic processing block has a plurality of signal paths. One or more of the plurality of signal paths includes respective adjustable delay circuits. The spreading sequence generator is configured to output a sequence of pseudo-random numbers. The delay control circuit has an input coupled to an output of the spreading sequence number generator and one or more outputs coupled to respective delay adjustment inputs of the adjustable delay circuits. The delay control circuit is configured to adjust the adjustable delay circuits based on the pseudo-random numbers.
    Type: Grant
    Filed: April 7, 2010
    Date of Patent: December 15, 2015
    Assignee: XILINX, INC.
    Inventors: Austin H. Lesea, Stephen M. Trimberger
  • Publication number: 20150358084
    Abstract: Various apparatuses, circuits, systems, and methods for optical communication are disclosed. In some implementations, an apparatus includes a package substrate and f first interposer mounted on the package substrate. The apparatus also includes a logic circuit and an optical interface circuit connected to the logic circuit via the first interposer. One of the optical interface circuit or the logic circuit is mounted on the first interposer. The optical interface circuit includes a driver circuit configured to receive electronic data signals from the logic circuit. The optical interface circuit also includes an optical transmitter circuit coupled to the driver circuit and configured to output optical data signals encoding the electronic data signals.
    Type: Application
    Filed: June 5, 2014
    Publication date: December 10, 2015
    Applicant: Xilinx, Inc.
    Inventors: Austin H. Lesea, Stephen M. Trimberger
  • Publication number: 20150358085
    Abstract: Various apparatuses, circuits, systems, and methods for optical communication are disclosed. In some implementations an optical transmitter includes an optical data port configured to engage an optical fiber. The optical transmitter also includes a plurality of lasers coupled to the optical data port and configured and arranged to transmit respective optical signals over the optical fiber via the optical data port when selected. A control circuit of the optical transmitter is configured to receive an input data signal and encode the input data signal for transmission over the optical fiber by selecting one or more of the plurality of lasers at a time. The control circuit is configured to select one or more of the plurality of lasers at a time according to one of a frequency modulation encoding algorithm or an amplitude modulation encoding algorithm.
    Type: Application
    Filed: June 5, 2014
    Publication date: December 10, 2015
    Applicant: Xilinx, Inc.
    Inventors: Stephen M. Trimberger, Austin H. Lesea
  • Publication number: 20150236856
    Abstract: One approach for authenticating data includes storing a plurality of combinations of representations of public keys and session key IDs in a non-volatile memory. A payload and accompanying public key, session key ID, and signature of the payload are input. The signature is a function of the payload and a private key of a key pair that includes the accompanying public key and the private key. Authenticity of the payload is determined based on the accompanying public key and session key ID and the combinations stored in the non-volatile memory, and from the signature and the payload. In response to determining that the payload is authentic, the payload is processed, and in response to determining that the payload is not authentic, processing of the payload is disabled.
    Type: Application
    Filed: February 20, 2014
    Publication date: August 20, 2015
    Applicant: Xilinx, Inc.
    Inventors: Jason J. Moore, Steven E. McNeil, Stephen M. Trimberger
  • Patent number: 9082514
    Abstract: A method, non-transitory computer readable medium, and apparatus for performing physically unclonable function (PUF) burn-in are disclosed. For example, the method identifies, by a processor, a natural output of an integrated circuit before the integrated circuit is initialized, identifies, by the processor, a physical characteristic of the integrated circuit associated with the physically unclonable function, and ages, by the processor, the physical characteristic of the integrated circuit to burn-in the natural output of the integrated circuit.
    Type: Grant
    Filed: April 22, 2013
    Date of Patent: July 14, 2015
    Assignee: XILINX, INC.
    Inventor: Stephen M. Trimberger
  • Patent number: 8981810
    Abstract: A method, non-transitory computer readable medium, and apparatus for preventing accelerated aging of a physically unclonable function (PUF) circuit are disclosed. For example, the method monitors an environmental condition associated with the physically unclonable function circuit, detects a change in the environmental condition associated with the physically unclonable function circuit, and, in response to the change in the environmental condition, implements a security function for preventing the accelerated aging of the physically unclonable function circuit.
    Type: Grant
    Filed: April 22, 2013
    Date of Patent: March 17, 2015
    Assignee: Xilinx, Inc.
    Inventors: Stephen M. Trimberger, Austin H. Lesea
  • Patent number: 8972744
    Abstract: A method and system of preventing data imprinting. The data includes a payload and a token that may be stored in a memory. The token provides information about the payload format and determines how that payload may be interpreted. The data field may be corrected and read into a device or may be converted and then written back to the memory.
    Type: Grant
    Filed: February 14, 2008
    Date of Patent: March 3, 2015
    Assignee: Xilinx, Inc.
    Inventor: Stephen M. Trimberger
  • Patent number: 8966253
    Abstract: A method and apparatus for authenticating a bitstream used to configure programmable devices are described. In an example, the bitstream is received via a configuration port of the programmable device, the bitstream including instructions for programming configuration registers of the programmable device and at least one embedded message authentication code (MAC). At least a portion of the instructions is initially stored in a memory of the programmable device without programming the configuration registers. At least one actual MAC is computed based on the bitstream using a hash algorithm. The at least one actual MAC is compared with the at least one embedded MAC, respectively. Each instruction stored in the memory is executed to program the configuration registers until any one of the at least one actual MAC is not the same as a corresponding one of the at least one embedded MAC, after which any remaining instructions in the memory are not executed.
    Type: Grant
    Filed: June 1, 2010
    Date of Patent: February 24, 2015
    Assignee: Xilinx, Inc.
    Inventor: Stephen M. Trimberger
  • Patent number: 8909941
    Abstract: A method of enabling detection of tampering with data provided to a programmable integrated circuit is described. The method comprises modifying a portion of the data to establish randomness in the data; and inserting, by a computer, a redundancy check value in the portion, wherein the redundancy check value is based upon the modified portion of the data. A programmable integrated circuit is also described.
    Type: Grant
    Filed: March 31, 2011
    Date of Patent: December 9, 2014
    Assignee: Xilinx, Inc.
    Inventor: Stephen M. Trimberger
  • Patent number: 8892903
    Abstract: A circuit for detecting power analysis attacks includes at least one load circuit, a power supply line, and a switch coupled to the load circuit and to the power supply line. The switch is configured to enable and disable the at least one load circuit, and a voltage monitor is configured to sample voltage levels of the supply voltage. A detection circuit is coupled to the switch and to the voltage monitor. The detection circuit is configured to generate control signals for enabling and disabling the at least one load circuit, compare a first voltage level sampled when the at least one load circuit is disabled to a second voltage level sampled when the at least one load circuit is enabled, and generate an attack-detection signal in response to a difference between the sampled first voltage level and the sampled second voltage level being greater than a threshold voltage level.
    Type: Grant
    Filed: December 6, 2012
    Date of Patent: November 18, 2014
    Assignee: Xilinx, Inc.
    Inventor: Stephen M. Trimberger
  • Patent number: 8872536
    Abstract: An embodiment of a method to characterize a die is disclosed. The embodiment of the method includes measuring a quality metric of the die, and determining, prior to a final test stage, whether the quality metric of the die satisfies a first constraint, where the first constraint is more stringent than a second constraint at the final test stage for the quality metric of the die.
    Type: Grant
    Filed: March 22, 2011
    Date of Patent: October 28, 2014
    Assignee: Xilinx, Inc.
    Inventors: Stephen M. Trimberger, Babak Ehteshami
  • Patent number: 8832462
    Abstract: An embodiment of a method is disclosed for protecting sensitive data from discovery during an operation performed on input data with the sensitive data. This embodiment of the method includes performing the operation on a first quantity of random data with the sensitive data using a circuit arrangement before performing the operation with the sensitive data on the input data using the circuit arrangement. After performing the operation with the sensitive data on the first quantity of the random data, the operation is performed with the sensitive data on the input data using the circuit arrangement. After performing the operation with the sensitive data on the input data, the operation is performed with the sensitive data on a second quantity of random data using the circuit arrangement.
    Type: Grant
    Filed: September 8, 2010
    Date of Patent: September 9, 2014
    Assignee: Xilinx, Inc.
    Inventor: Stephen M. Trimberger
  • Patent number: 8823405
    Abstract: An integrated circuit has a first independent power domain having a first power domain bus electrically connected to first functional blocks and a first power pad electrically connected to the first power domain bus and a second independent power domain having a second power domain bus electrically connected to second functional blocks and a second power pad electrically connected to the second power domain bus. A test element is between the first power domain bus and the second power domain bus.
    Type: Grant
    Filed: September 10, 2010
    Date of Patent: September 2, 2014
    Assignee: Xilinx, Inc.
    Inventor: Stephen M. Trimberger