Texas Instruments Corporation

Xilinx, Inc.

Usha Narasimha

Nagaraj Narasimh Savithri

Anthony Martin Hill

Palkesh Jain

John Chrysostom Apostol

Atul Srinivasan

Generating delays for a clock circuit includes, determining, using a processor, groups of contexts for exit points of the clock circuit based upon a plurality of characteristics and a type selected from a plurality of different types for each characteristic, forming, using the processor, sub-groups of the exit points based upon delay values for the exit points, and determining, using the processor, a mean delay value for each sub-group.

Generating delays of exit points for a clock circuit

Disclosed approaches for processing a circuit design targeted to a programmable integrated circuit (IC) include inputting the circuit design to a programmed processor. Each path of the circuit design specifies a plurality of circuit elements of the programmable IC. For each circuit element specified in a path of the plurality of paths the processor looks up in a memory a mean delay associated with the circuit element, looks up a sigma factor associated with the circuit element, and looks up a delta factor associated with the circuit element. The processor determines a delay of the path as a function of the mean delay, sigma factor, and delta factor of each circuit element in the path.

Timing verification in a programmable circuit design using variation factors

Multi-mode circuit (the circuit) and a method for preventing degradation in the circuit. The circuit includes a first transistor that enables functioning of the circuit in a first mode. The first transistor is responsive to a first signal to become inactive when the circuit enters into a second mode, thereby preventing degradation of the first transistor when the circuit enters into the second mode. A second transistor is coupled to the first transistor. The second transistor is responsive to a second signal to generate a third signal. A third transistor is coupled to the second transistor. The third transistor is responsive to the third signal to become inactive when the circuit enters into the second mode, thereby preventing degradation of the third transistor when the circuit enters into the second mode.

Multi-mode circuit and a method for preventing degradation in the multi-mode circuit

A novel approach to cross-talk analysis takes effective account of the nature of cross-talk interference. This approach employs conservative assumptions regarding (1) the equivalent output resistance, and (2) the definition of noise immunity for the victim gate. Also, this approach uses signal and noise current metrics in modeling the parameters of the active device elements. This approach provides an expectation of detection and elimination of noise hazards that might otherwise not be undetected.

Accurate noise modeling in digital designs

The method of this invention determines the timing of an integrated circuit design. At each node, the method determines if the timing of signal propagation at that node is critical. If this timing is critical, method calculates the capacitance at said current node using a highly accurate but computationally intensive model. If this timing is not critical, the method uses a less accurate but less computationally intensive model. The method calculates a signal delay for each node from the drive strength, calculated capacitance and fan-out. This signal delay is compared to a design goal. This method achieves a better trade-off between timing determination run-time and accuracy. Timing criticality can be determined from one or more of conductor length/area, fan-out, logic depth and timing slack.

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Plano, TX, United States of America

Usha Narasimha