A test simulator for simulating a test of a semiconductor device is disclosed, the test simulator including: a test pattern holding unit for holding an existing test pattern to be supplied to the semiconductor device; a device output holding unit for preliminarily holding an output to be obtained from the semiconductor device when the existing test pattern is supplied; a test pattern generating unit for generating a new test pattern to be supplied to the semiconductor device; a test pattern deci...

A solution for analyzing a circuit using initial charge information is provided. In particular, one or more nodes in a design for the circuit is initialized with an initial charge. The charge can comprise a non-equilibrium charge, thereby simulating the history effect, the impact of a charged particle, electro-static discharge (ESD), and/or the like. Operation of the circuit is then simulated over the set of input cycles based on the initial charge(s). To this extent, the non-equilibrium initial...

A solution of a first set of equations of the time-varying electrical response of a circuit is determined between pairs of adjacent time points t.sub.i and t.sub.i+1 based on predicted electrical responses of the devices at time point t.sub.i+1 and as a function of the initial temperatures of the circuit devices at time point t.sub.i. A solution of a second set of equations of the time-varying temperature responses of devices of the circuit is determined (1) after each iteration of the first set...

A method and system for analyzing transaction level simulation data of an integrated circuit design. In an embodiment, a transaction fiber is plotted. The transaction fiber comprises a transaction block. A compact representation of a child block of the transaction block is provided when the transaction fiber is in a collapsed state. In one embodiment, the compact representation of the child block is provided by drawing a line segment below the transaction fiber.

A system for providing a runnable computer simulation model comprises a design automation software product for enabling a designer to create a simulation model including interconnected component and/or subsystem models. The system also comprises a simulation content file creation means for creating a simulation content file that includes information describing the simulation model; and a simulation player software product including means for reading the simulation content file. The simulation pl...

A logic simulation processor stores in a shift register intermediate values generated during the logic simulation. The simulation processor includes multiple processor units and an interconnect system that communicatively couples the processor units to each other. Each of the processor units includes a processor element configurable to simulate at least a logic gate, and a shift register associated with the processor element. The shift register includes multiple entries to store the intermediate...

A system for communicating simulation solutions between circuit components in a hierarchical data structure includes a simulator module having one or more computer programs for representing the circuit as a hierarchically arranged set of branches, which includes a root branch and a plurality of other branches logically organized in a graph. The hierarchically arranged set of branches includes a first branch that contains one or more driver leaf circuits and a second branch that also contains one...

A technique for performing signal integrity analysis of a system includes providing a stimulus pattern and a model of the system and performing analog simulation of the model utilizing the stimulus pattern. The stimulus pattern includes sequences of signal transitions with associated transition times and the sequences of signal transitions conform to a bus protocol and the associated transition times are according to characteristics of the system. The stimulus pattern is generated by initializin...

From the data of diffusion-length-dependent parameters extracted from the parameters of the transistor model of MOS transistors and from the parameters of transistors having various diffusion lengths, a diffusion-length-dependent parameter correcting unit creates approximate expressions of the diffusion length dependence of these parameters, and calculates parameter correction values to be used instead of original parameter values by using the created approximate expressions. Hence, the correcti...

The invention relates to a method for eliminating routing congestion in an integrated circuit (IC) layout defined by a placement plan indicating a position within the layout of each cell forming the IC and routing plan describing routes followed by nets interconnecting the cells. Routing congestion is eliminated by estimating routing congestion in various areas of the layout and relocating each cell to least routing congested areas of the layout for which cell relocation results in a reduction i...