US Patent No: 5,734,581

Number of patents in Portfolio can not be more than 2000

Method for implementing tri-state nets in a logic emulation system

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Abstract

A plurality of electronically reconfigurable gate array (ERCGA) logic chips are interconnected via a reconfigurable interconnect, and electronic representations of large digital networks are converted to take temporary actual operating hardware form on the interconnected chips. The reconfigurable interconnect permits the digital network realized on the interconnected chips to be changed at will, making the system well suited for a variety of purposes including simulation, prototyping, execution and computing. The reconfigurable interconnect may comprise a partial crossbar that is formed of ERCGA chips dedicated to interconnection functions, wherein each such interconnect ERQGA is connected to at least one, but not all of the pins of a plurality of the logic chips. Other reconfigurable interconnect topologies are also detailed.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
QUICKTURN DESIGN SYSTEMS, INC.SAN JOSE, CA15

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Batcheller, Jon A Newberg, OR 10 750
Butts, Michael R Portland, OR 44 1675

Cited Art

Patent Info (Count) # Cites Year
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (10)
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4,695,999 Cross-point switch of multiple autonomous planes 64 1986
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NEC CORPORATION (6)
4,541,071 Dynamic gate array whereby an assembly of gates is simulated by logic operations on variables selected according to the gates 41 1983
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
4,924,429 Hardware logic simulator 50 1988
5,041,986 Logic synthesis system comprising a memory for a reduced number of translation rules 32 1989
 
XILINX, INC. (6)
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MENTOR GRAPHICS CORPORATION (4)
4,787,061 Dual delay mode pipelined logic simulator 55 1986
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5,377,124 Field programmable printed circuit board 45 1989
 
Bell Telephone Laboratories, Incorporated (3)
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4,577,276 Placement of components on circuit substrates 118 1983
4,908,772 Integrated circuits with component placement by rectilinear partitioning 135 1987
 
Hitachi Microcomputer Engineering Ltd. (3)
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LATTICE SEMICONDUCTOR CORPORATION (3)
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5,260,881 Programmable gate array with improved configurable logic block 73 1989
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QUICKTURN DESIGN SYSTEMS, INC. (3)
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ATMEL CORPORATION (2)
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FUJITSU LIMITED (2)
4,942,615 Gate processor arrangement for simulation processor system 38 1988
5,258,932 PLA simulation method 24 1991
 
HITACHI, LTD. (2)
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5,231,589 Input/output pin assignment method 34 1990
 
MITSUBISHI DENKI KABUSHIKI KAISHA (2)
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AMP Incorporated (1)
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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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DUKE UNIVERSITY (1)
4,621,339 SIMD machine using cube connected cycles network architecture for vector processing 157 1983
 
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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INTEL CORPORATION (1)
5,023,775 Software programmable logic array utilizing "and" and "or" gates 105 1990
 
ITT CORPORATION (1)
4,722,084 Array reconfiguration apparatus and methods particularly adapted for use with very large scale integrated circuits 61 1985
 
KABUSHIKI KAISHA TOSHIBA (1)
4,823,276 Computer-aided automatic wiring method for semiconductor integrated circuit device 48 1987
 
KAWASAKI MICROELECTRONICS, INC. (1)
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LSI LOGIC CORPORATION (1)
4,901,259 Asic emulator 82 1988
 
MARHOEFER, LAURENCE J. (1)
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MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
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NATIONAL SEMICONDUCTOR CORPORATION (1)
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NCR CORPORATION (1)
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NORTEL NETWORKS LIMITED (1)
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NORTHROP GRUMMAN CORPORATION (1)
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PRINCETON UNIVERSITY, NON-PROFIT ORGANIZATION (1)
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RACAL RESEARCH INC. (1)
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RCA Corporation (1)
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RICA CORPORATION, A CORP. OF DE (1)
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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
 
SIEMENS AKTIENGESELLSCHAFT (1)
4,951,220 Method and apparatus for manufacturing a test-compatible, largely defect-tolerant configuration of redundantly implemented, systolic VLSI systems 38 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 76 1989
 
ZORAN CORPORATION (1)
4,786,904 Electronically programmable gate array having programmable interconnect lines 166 1986
 
Other [Check patent profile for assignment information] (4)
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
 
XILINX, INC. (4)
7,024,651 Partial reconfiguration of a programmable gate array using a bus macro 7 2002
7,669,163 Partial configuration of a programmable gate array using a bus macro and coupling the third design 0 2006
7,478,357 Versatile bus interface macro for dynamically reconfigurable designs 4 2006
7,619,442 Versatile bus interface macro for dynamically reconfigurable designs 0 2008
 
CADENCE DESIGN SYSTEMS, INC. (3)
6,618,698 Clustered processors in an emulation engine 35 1999
7,739,097 Emulation system with time-multiplexed interconnect 4 2002
7,047,179 Clustered processors in an emulation engine 0 2003
 
INTELLECTUAL VENTURES I LLC (2)
7,161,385 Circuit elements and parallel computational networks with logically entangled terminals 1 2004
RE43514 Circuit elements and parallel computational networks with logically entangled terminals 0 2009
 
SRC COMPUTERS, INC. (2)
7,155,602 Interface for integrating reconfigurable processors into a general purpose computing system 10 2001
7,167,976 Interface for integrating reconfigurable processors into a general purpose computing system 1 2005
 
GOOGLE INC. (1)
7,337,103 Method and apparatus for the automatic correction of faulty wires in a logic simulation hardware emulator / accelerator 0 2004
 
INTEL CORPORATION (1)
7,130,784 Logic simulation 0 2001
 
LIGA SYSTEMS, INC. (1)
7,444,276 Hardware acceleration system for logic simulation using shift register as local cache 2 2005
 
MENTOR GRAPHICS CORPORATION (1)
6,920,597 Uniform testing of tristate nets in logic BIST 3 2002
 
NUMERATE, INC. (1)
7,577,553 Method and apparatus for molecular mechanics analysis of molecular systems 0 2003
 
SYNOPSYS, INC. (1)
6,051,031 Module-based logic architecture and design flow for VLSI implementation 17 1997
 
TEXAS INSTRUMENTS INCORPORATED (1)
6,928,403 Automatic detection of connectivity between an emulator and a target device 2 2001
 
Other [Check patent profile for assignment information] (1)
6,263,484 Prototyping system and a method of operating the same 46 1998