US Patent No: 5,644,515

Number of patents in Portfolio can not be more than 2000

Hardware logic emulation system capable of probing internal nodes in a circuit design undergoing emulation

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Abstract

A system for physical emulation of electronic circuits or systems includes a data entry workstation where a user may input data representing the circuit or system configuration. This data is converted to a form suitable for programming an array of programmable gate elements provided with a richly interconnected architecture. Provision is made for externally connecting VLSI devices or other portions of a user's circuit or system. A network or internal probing interconnections is made available by utilization of unused circuit paths in the programmable gate arrays.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CADENCE DESIGN SYSTEMS, INC.SAN JOSE, CA1294

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
D'Amour, Michael R Los Altos Hills, CA 7 460
Payne, Thomas S Union City, CA 12 495
Sample, Stephen P Mountain View, CA 40 2056

Cited Art

Patent Info (Count) # Cites Year
 
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4,849,904 Macro structural arrangement and method for generating macros for VLSI semiconductor circuit devices 53 1987
5,003,487 Method and apparatus for performing timing correction transformations on a technology-independent logic model during logic synthesis 91 1988
 
NEC CORPORATION (7)
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4,752,887 Routing method for use in wiring design 71 1986
4,747,102 Method of controlling a logical simulation at a high speed 32 1986
4,945,503 Hardware simulator capable of reducing an amount of information 42 1987
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5,041,986 Logic synthesis system comprising a memory for a reduced number of translation rules 32 1989
 
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BELL TELEPHONE LABORATORIES, INCORPORATED (4)
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QUICKTURN DESIGN SYSTEMS, INC. (4)
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ACTEL CORPORATION (3)
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ATMEL CORPORATION (3)
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HITACHI MICROCOMPUTER ENGINEERING LTD. (3)
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LATTICE SEMICONDUCTOR CORPORATION (3)
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FUJITSU LIMITED (2)
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INTEL CORPORATION (2)
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MENTOR GRAPHICS CORPORATION (2)
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MITSUBISHI DENKI KABUSHIKI KAISHA (2)
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AT&T BELL LABORATORIES (1)
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BANK SOUTH, N.A. (1)
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CIRRUS LOGIC INTERNATIONAL LTD. (1)
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COMPUTER NETWORK TECHNOLOGY CORPORATION (1)
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DUKE UNIVERSITY (1)
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FORDAHL S.A.R.L. (1)
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FREESCALE SEMICONDUCTOR, INC. (1)
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HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
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HITACHI SOFTWARE ENGINEERING CO., LTD. (1)
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HITACHI, LTD. (1)
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ITT CORPORATION (1)
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KABUSHIKI KAISHA TOSHIBA (1)
4,823,276 Computer-aided automatic wiring method for semiconductor integrated circuit device 48 1987
 
LOCKHEED MARTIN CORPORATION (1)
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LSI LOGIC CORPORATION (1)
4,901,259 Asic emulator 82 1988
 
MARHOEFER, LAURENCE J. (1)
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MICRON TECHNOLOGY, INC. (1)
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NCR CORPORATION (1)
4,901,260 Bounded lag distributed discrete event simulation method and apparatus 65 1987
 
NIZDORF COMPUTER CORPORATION (1)
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NORTEL NETWORKS LIMITED (1)
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PRINCETON UNIVERSITY, NON-PROFIT ORGANIZATION (1)
4,811,214 Multinode reconfigurable pipeline computer 209 1986
 
RACAL RESEARCH INC. (1)
4,768,196 Programmable logic array 54 1986
 
RCA CORPORATION (1)
4,612,618 Hierarchical, computerized design of integrated circuits 106 1983
 
RICA CORPORATION, A CORP. OF DE (1)
4,815,003 Structured design method for high density standard cell and macrocell layout of VLSI chips 142 1987
 
RICOH COMPANY, LTD. (1)
4,922,432 Knowledge based method and apparatus for designing integrated circuits using functional specifications 169 1988
 
SAMSUNG ELECTRONICS CO., LTD. (1)
4,488,354 Method for simulating and testing an integrated circuit chip 61 1981
 
SGS-THOMSON MICROELECTRONICS S.A. (1)
4,958,324 Method for the testing of electrically programmable memory cells, and corresponding integrated circuit 33 1988
 
SHANE GROUP, INC., THE (1)
4,459,694 Field programmable device with circuitry for detecting poor insulation between adjacent word lines 21 1981
 
SIEMENS AKTIENGESELLSCHAFT (1)
4,951,220 Method and apparatus for manufacturing a test-compatible, largely defect-tolerant configuration of redundantly implemented, systolic VLSI systems 37 1988
 
TEXAS INSTRUMENTS INCORPORATED (1)
4,740,919 Electrically programmable logic array 35 1986
 
U.S. PHILIPS CORPORATION (1)
4,656,592 Very large scale integrated circuit subdivided into isochronous regions, method for the machine-aided design of such a circuit, and method for the machine-aided testing of such a circuit 101 1984
 
UNITED KINGDOM AND BRITISH TELECOMMUNICATIONS (1)
4,675,832 Visual display logic simulation system 75 1984
 
VLSI TECHNOLOGY, INC. (1)
4,965,739 Machine process for routing interconnections from one module to another module and for positioning said two modules after said modules are interconnected 75 1989
 
ZOATRAM MGMT. LIMITED LIABILITY COMPANY (1)
5,253,363 Method and apparatus for compiling and implementing state-machine states and outputs for a universal cellular sequential local array 29 1990
 
ZORAN CORPORATION (1)
4,786,904 Electronically programmable gate array having programmable interconnect lines 166 1986
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (5)
4,539,564 Electronically controlled interconnection system 28 1982
4,682,440 Animal trap 28 1986
4,849,928 Logic array programmer 41 1987
4,827,427 Instantaneous incremental compiler for producing logic circuit designs 101 1987
5,051,938 Simulation of selected logic circuit designs 118 1989

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
SYNOPSYS, INC. (11)
7,072,818 Method and system for debugging an electronic system 19 2000
6,581,191 Hardware debugging in a hardware description language 102 2000
7,065,481 Method and system for debugging an electronic system using instrumentation circuitry and a logic analyzer 21 2002
6,823,497 Method and user interface for debugging an electronic system 82 2002
7,222,315 Hardware-based HDL code coverage and design analysis 11 2003
6,904,577 Hardware debugging in a hardware description language 17 2003
7,356,786 Method and user interface for debugging an electronic system 7 2004
7,069,526 Hardware debugging in a hardware description language 10 2004
8,099,271 Design instrumentation circuitry 1 2004
7,506,286 Method and system for debugging an electronic system 5 2006
7,836,416 Hardware-based HDL code coverage and design analysis 4 2007
 
CADENCE DESIGN SYSTEMS, INC. (6)
5,821,773 Look-up table based logic element with complete permutability of the inputs to the secondary signals 44 1995
6,141,636 Logic analysis subsystem in a time-sliced emulator 14 1997
6,618,698 Clustered processors in an emulation engine 34 1999
7,107,203 High speed software driven emulator comprised of a plurality of emulation processors with improved board-to-board interconnection cable length identification system 1 2000
7,047,179 Clustered processors in an emulation engine 0 2003
7,739,093 Method of visualization in processor based emulation system 1 2005
 
ALTERA CORPORATION (5)
6,294,928 Programmable logic device with highly routable interconnect 24 1997
6,184,706 Logic device architecture and method of operation 5 1998
6,181,162 Programmable logic device with highly routable interconnect 32 1998
6,414,514 Logic device architecture and method of operation 5 2000
6,492,834 Programmable logic device with highly routable interconnect 38 2001
 
VERISITY DESIGN, INC. (4)
6,421,251 Array board interconnect system and method 26 1998
6,134,516 Simulation server system and method 84 1998
6,026,230 Memory simulation system and method 72 1998
6,389,379 Converification system and method 120 1998
 
NVIDIA CORPORATION (2)
6,502,221 Prototype development system 4 1999
6,618,842 Prototype development system and method 0 2001
 
QUICKTURN DESIGN SYSTEMS, INC. (2)
5,963,735 Hardware logic emulation system 27 1997
6,184,707 Look-up table based logic element with complete permutability of the inputs to the secondary signals 144 1998
 
VERSITY DESIGN, INC. (2)
6,009,256 Simulation/emulation system and method 101 1997
6,321,366 Timing-insensitive glitch-free logic system and method 102 1998
 
AZIMUTH SYSTEMS, INC. (1)
7,349,670 Modular wireless test architecture and method 7 2005
 
LOGIC EXPRESS SYSTEMS (1)
5,903,744 Logic emulator using a disposable wire-wrap interconnect board with an FPGA emulation board 16 1997
 
LUCENT TECHNOLOGIES INC. (1)
6,442,732 Virtual logic system for solving satisfiability problems using reconfigurable hardware 21 1999
 
RAVESIM, INC. (1)
6,279,146 Apparatus and method for verifying a multi-component electronic design 46 1999
 
S2C INC. (1)
7,353,162 Scalable reconfigurable prototyping system and method 14 2005
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
6,016,563 Method and apparatus for testing a logic design of a programmable logic device 58 1997