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| Number | Title | Issue Date |
| 5325309 | Method and apparatus for integrated circuit diagnosis A technique for pinpointing and analyzing failures in complex integrated circuits is disclosed. A tester stimulates the a device (DUT) with input patterns. DUT output patterns are communicated back to the tester, and are compared to simulation results. Fa... | 06/28/1994 |
| 5263149 | Integrated circuit logic functions simulator for selectively connected series of preprogrammed PLA devices using generated sequence of address signals being provided between simulated clock cycles A hardware simulator comprises a plurality of interconnected programmable logic devices (20) which are connected via a data bus (22) and a control bus (24). Address signals on control bus (24) are read by an interconnect logic block (18) associated with e... | 11/16/1993 |
| 5258932 | PLA simulation method In logical simulation, required data amounts to a large volume when PLAs are used for circuit design. The present invention compresses PLA data for use in logical simulation and reduce necessary data volume. According to the PLA simulation method, PLA dat... | 11/02/1993 |
| 5245549 | Gate addressing system for logic simulation machine A gate addressing system of a logic simulation machine performs translation from data of a circuit design data base to circuit data for the logic simulation machine. The system numbers each input terminal of a circuit and each gate of said circuit without... | 09/14/1993 |
| 5222030 | Methodology for deriving executable low-level structural descriptions and valid physical implementations of circuits and systems from high-level semantic specifications and descriptions thereof A methodology for generating structural descriptions of complex digital devices from high-level descriptions and specifications is disclosed. The methodology uses a systematic technique to map and enforce consistency of the semantics imbedded in the inten... | 06/22/1993 |
| 5193068 | Method of inducing off-circuit behavior in a physical model A simulation model is provided which comprises a combination of software models and a hardware model. Induced off-circuit behavior of the hardware model during simulation is achieved by presenting it with off-circuit input patterns and sampling the result... | 03/09/1993 |
| 5184308 | Fault simulation method A logic circuit to be an object for fault simulation is logically modified into a logic circuit configuration using logic gates of a predetermined basic gate form. Pin management data indicative of a correspondence of pins of the logic gates to a position... | 02/02/1993 |
| 5142469 | Method for converting a programmable logic controller hardware configuration and corresponding control program for use on a first programmable logic controller to use on a second programmable logic controller A method is provided for converting a hardware configuration and corresponding control logic program for use on a first programmable logic controller (PLC) to an equivalent hardware configuration and control logic program for use on a second PLC. A graphi... | 08/25/1992 |
| 5051941 | Method and apparatus for logical simulation A method of logic simulation for simulating operation of a logic circuit by using basic signal values corresponding to states of output signals of elements of the logic circuit to be simulated and expanded signal values including the basic signal values. ... | 09/24/1991 |
| 5051911 | Apparatus for effecting simulation of a logic circuit and method for producing a semiconductor device using the simulation approach An apparatus for effecting a logic circuit simulation based on logic circuit information concerning the logic circuit and input signal information concerning each of circuit elements constituting the logic circuit according to simulation control informati... | 09/24/1991 |
| 5051938 | Simulation of selected logic circuit designs A system and method for selectively simulating logic circuit designs in which a data tables generator receives information from a schematic entry program or netlist entry file and produces data tables for use by a simulator. A designer provides inputs to ... | 09/24/1991 |
| 5018089 | Logic simulation method and apparatus Determining the operation of a logic circuit through calculation is generally called logic simulation. Especially, in event driven type logic simulation, signal status changes at input and output terminals of an element of the logic circuit are deemed as ... | 05/21/1991 |
| 4982361 | Multiple loop parallel pipelined logic simulation system The present invention is capable of registering and reading out a logical element for which the state of the output pin changes. The system includes an input side reading out circuit for reading out the kind of logical element and the states of all the in... | 01/01/1991 |
| 4961156 | Simulation capable of simultaneously simulating a logic circuit model in response to a plurality of input logic signals In a logic simulator for simulating a logic circuit model which is operable in response to first through k-th input logic signals where k is a natural number greater than unity, the first through k-th input logic signals are read out of a memory to simult... | 10/02/1990 |
| 4951221 | Cell stack for variable digit width serial architecture A design methodology for digit serial architecture, especially for use in digital signal processing circuitry, includes a cell stack configuration incorporating a variable number of individual operation cells in conjunction with cap and control cells to p... | 08/21/1990 |
| 4945503 | Hardware simulator capable of reducing an amount of information In a hardware simulator for use in successively carrying out simulations of gates arranged in a logic circuit, a plurality of connection data signals are stored in a connection memory to specify connections among the gates while a plurality of gate specie... | 07/31/1990 |
| 4937755 | Production system for an expert system A production system for an expert system comprising: a production rule memory unit storing circuit conversion rules, each having a condition part describing circuit connection and an execution part describing a conversion of the condition part to an equiv... | 06/26/1990 |
| 4924429 | Hardware logic simulator A hardware logic simulator includes a first memory, having memory locations respectively corresponding to a plurality of signals in a logic circuit to be simulated, for storing data representing states of the plurality of signals, and a second memory havi... | 05/08/1990 |
| 4922445 | Logic circuit simulation method A logic circuit simulation method for simulating a logic circuit including a plurality of logic blocks, in which after having simulated the whole simulation object logic circuit, signal variation information of an arbitrary logic block is taken out from t... | 05/01/1990 |
| 4918594 | Method and system for logical simulation of information processing system including logic circuit model and logic function model A logical simulation system for a data processor includes a logic circuit model constituting a part of logic of the data processor to be tested with basic logic elements capable of calculating operation processes in detail, a logic function model describi... | 04/17/1990 |
| 4914612 | Massively distributed simulation engine A simulation engine for logically simulating a logic network, which is divided into several levels of hierarchy. At the lowest level is a logic chip which has stored in an instruction memory a sequentially executed program of logical operators and operand... | 04/03/1990 |
| 4891773 | Logic simulation In a logic simulation method for performing logic simulation of a logic circuit including a circuit with unknown internal logic, the circuit itself with the unknown internal logic is used. The internal status of the circuit is set at an objective status u... | 01/02/1990 |
| 4862347 | System for simulating memory arrays in a logic simulation machine A method and apparatus for simulating memory devices in a logic simulation machine include a finite state machine (FSM) having input/output (I/O) sources, instruction storage resources, a real memory resource, and instruction execution resources. A plural... | 08/29/1989 |
| 4821173 | Wired "OR" bus evaluator for logic simulation The present invention consists of a hardware simulator with bus evaluator logic for use in simulating and fault grading of very large scale digital circuits containing buses. In this invention the status of a bus is continously upgraded each time a primit... | 04/11/1989 |
| 4815016 | High speed logical circuit simulator An apparatus and method are provided for automatically converting a bottom-up software representation of a logical circuit design, such as created by a computer aided design (CAD) system, into a behavioral software representation which can be simulated at... | 03/21/1989 |
| 4787062 | Glitch detection by forcing the output of a simulated logic device to an undefined state Races and hazards in simulated logic designs are more easily detected if the logic simualtor is able to warn the designer of the presence of glitches. A glitch wall occur at the output of a logic device if an input condition causes the output to begin to ... | 11/22/1988 |
| 4782440 | Logic simulator using small capacity memories for storing logic states, connection patterns, and logic functions A logic simulator for simulating operation of a logic circuit is provided with gates divisible into successive levels according to a connection pattern between the gates. A pattern memory (16) memorizes the connection pattern as a bit sequence representat... | 11/01/1988 |
| 4777616 | Increased resolution logic analyzer using asynchronous sampling Techniques for a logic analyzer instrument that permit the acquisition of digital samples from a plurality of logic signals in a large mainframe computer, or other system under test, in a manner that the signals can be reconstructed for viewing and analys... | 10/11/1988 |
| 4775950 | Logic simulation system A simulation method and a computer therefor, i.e., a simulator, for simulating operation of a circuit employing logic gates. The simulation method is to be called the event drive method, in which the output processing is executed only when an input to cau... | 10/04/1988 |
| 4736338 | Programmable look up system A simulation technique for modeling the function of logic elements containing memory is disclosed. The technique uses a table to represent the logical function of the devices that are being simulated.... | 04/05/1988 |
| 4725975 | Logic simulator operable on level basis and on logic block basis on each level A logic device, which may be a digital computer, is simulated by dividing the device into logic blocks and classifying the blocks by levels according to flow of signals in the device. A state memory simulates input and output logic states of the respectiv... | 02/16/1988 |
| 4715035 | Method for the simulation of an error in a logic circuit and a circuit arrangement for implementation of the method A method for the simulation of an error in a logic circuit which comprises a bus optionally connectible to different logic levels, utilizes the assistance of input bit patterns from which output bit patterns are derived via a simulation model containing t... | 12/22/1987 |
| 4713606 | System for testing the failure or satisfactory operation of a circuit having logic components The invention relates to a system for testing the failure or satisfactory operation of a logic component circuit. The system comprises a generator, whose outputs are respectively connected to the simulation inputs of the components, in order to apply thereto ... | 12/15/1987 |
| 4697241 | Hardware logic simulator Apparatus for verifying the design of a logic circuit composed of a plurality of interconnected logic elements comprises a plurality of hardware gates, each of which is programmable so as to correspond to and emulate an element in said logic circuit. Each... | 09/29/1987 |
| 4675832 | Visual display logic simulation system An improved logic simulation system including a logic simulator which provides the logic states of elements within an electronic circuit being analyzed, means for associating the logic states with a schematic image of the electronic circuitry for display ... | 06/23/1987 |
| 4669083 | Apparatus for the simulation of the failure or satisfactory operation of a logic system An apparatus for simulating the failure or satisfactory operation of a system having a plurality of interconnected components. These components are subject to events, such as failures or repairs appearing in a sequentially combined manner. The apparatus c... | 05/26/1987 |
| 4594677 | System for detecting and diagnosing noise caused by simultaneous current switching A system for detecting and diagnosing noise caused by current switching in a computerized simulation model for analyzing composite logic circuits. The system includes a logic simulator for simulating logic experiments, a noise contributor information file... | 06/10/1986 |
| 4584642 | Logic simulation apparatus A logic simulation apparatus has a data memory for storing node level data of a logic circuit, a command memory for storing interconnection data which comprises an input data address, an output data address, a fan-out address and a function of module, and... | 04/22/1986 |
| 4527249 | Simulator system for logic design validation A hardware network or system is disclosed for testing LSI and VLSI logic device design and system design by simulation utilizing individual gate functions. The simulator system uses switching logic, random access memory, and a state table device to simula... | 07/02/1985 |
| 4306286 | Logic simulation machine A hardware logic simulation machine comprised of an array of specially designed parallel processors, with there being no theoretical limit to the number of processors which may be assembled into the array. Each processor executes a logic simulation functi... | 12/15/1981 |
