US Patent No: 4,855,619

Number of patents in Portfolio can not be more than 2000

Buffered routing element for a user programmable logic device

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Abstract

A programmable interconnect for programmably connecting transmission lines which are part of a configurable logic array is combined with a buffer at locations within the logic array where a signal will travel from a low capacitance line to a higher capacitance line. Use of a buffer in this arrangement allows for programmable interconnects controlling the configuration of the logic array to be smaller; consuming less power and providing for faster rise and fall of an output signal even when propagating through a long series of programmable interconnects. Several arrangements for programmably controlling the interconnect are taught. Also taught is a means of achieving a very wide AND gate without the need for cascading smaller devices.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
XILINX, INC.SAN JOSE, CA3059

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Carter, William S Santa Clara, CA 16 1516
Hsieh, Hung-Cheng Sunnyvale, CA 15 963

Cited Art

Patent Info (Count) # Cites Year
 
ACTEL CORPORATION (1)
4,758,745 User programmable integrated circuit interconnect architecture and test method 440 1986
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1)
4,709,173 Integrated circuit having latch circuit with multiplexer selection function 20 1986
 
MOTOROLA, INC. (1)
4,544,854 Analog switch structure having low leakage current 14 1983
 
ROBERT BOSCH GMBH (1)
4,371,797 Circuit for decreasing the effect of parasitic capacitances in field effect transistors used in coupling networks 12 1980
 
XILINX, INC. (1)
4,642,487 Special interconnect for configurable logic array 396 1984

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
XILINX, INC. (12)
5,504,440 High speed programmable logic architecture 64 1994
5,581,199 Interconnect architecture for field programmable gate array using variable length conductors 117 1995
5,614,844 High speed programmable logic architecture 16 1995
5,742,179 High speed programmable logic architecture 46 1995
5,760,604 Interconnect architecture for field programmable gate array 28 1996
5,801,546 Interconnect architecture for field programmable gate array using variable length conductors 52 1996
6,218,856 High speed programmable logic architecture 4 1996
5,808,479 High speed programmable logic architecture 14 1997
5,844,424 Programmably bidirectional buffered interconnect circuit 11 1997
5,898,320 Programmable interconnect point having reduced crowbar current 4 1997
6,369,608 Conditioning semiconductor-on-insulator transistors for programmable logic devices 2 2001
6,664,807 Repeater for buffering a signal on a long data line of a programmable logic device 18 2002
 
ACTEL CORPORATION (9)
5,537,056 Antifuse-based FPGA architecture without high-voltage isolation transistors 28 1994
5,594,698 Random access memory (RAM) based configurable arrays 10 1994
6,160,420 Programmable interconnect architecture 35 1996
7,382,156 Method and apparatus for universal program controlled bus architecture 26 2005
7,409,664 Architecture and interconnect scheme for programmable logic circuits 2 2005
7,646,218 Architecture and interconnect scheme for programmable logic circuits 1 2008
7,830,173 Method and apparatus for universal program controlled bus architecture 2 2009
7,915,918 Method and apparatus for universal program controlled bus architecture 0 2010
8,289,047 Architecture and interconnect scheme for programmable logic circuits 0 2010
 
ALTERA CORPORATION (9)
5,260,610 Programmable logic element interconnections for programmable logic array integrated circuits 389 1991
5,260,611 Programmable logic array having local and long distance conductors 410 1992
5,376,844 Programmable logic device with multiplexer-based programmable interconnections 46 1993
5,371,422 Programmable logic device having multiplexers and demultiplexers randomly connected to global conductors for interconnections between logic elements 205 1993
5,436,575 Programmable logic array integrated circuits 63 1993
5,483,178 Programmable logic device with logic block outputs coupled to adjacent logic block output multiplexers 146 1994
5,485,103 Programmable logic array with local and global conductors 167 1994
5,883,850 Programmable logic array integrated circuits 52 1996
6,759,870 Programmable logic array integrated circuits 2 2003
 
QUICKLOGIC CORPORATION (7)
5,294,846 Method and apparatus for programming anti-fuse devices 32 1992
5,424,655 Programmable application specific integrated circuit employing antifuses and methods therefor 45 1994
5,477,167 Programmable application specific integrated circuit using logic circuits to program antifuses therein 31 1995
5,469,109 Method and apparatus for programming anti-fuse devices 15 1995
5,654,649 Programmable application specific integrated circuit employing antifuses and methods therefor 22 1995
5,682,106 Logic module for field programmable gate array 17 1996
5,892,684 Programmable application specific integrated circuit employing antifuses and methods therefor 5 1997
 
ATMEL CORPORATION (2)
5,218,240 Programmable logic cell and array with bus repeaters 83 1992
5,594,366 Programmable logic device with regional and universal signal routing 60 1995
 
CROSSPOINT SOLUTIONS, INC. (2)
5,527,745 Method of fabricating antifuses in an integrated circuit device and resulting structure 15 1993
5,629,636 Ram-logic tile for field programmable gate arrays 4 1995
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
5,717,346 Low skew multiplexer network and programmable array clock/reset application thereof 3 1996
5,703,498 Programmable array clock/reset resource 9 1996
 
LATTICE SEMICONDUCTOR CORPORATION (2)
5,384,497 Low-skew signal routing in a programmable array 23 1992
5,528,170 Low-skew signal routing in a programmable array 8 1995
 
ALCATEL ESPACE (1)
5,410,731 Satellite telecommunications facility capable of covering a plurality of coverage areas 21 1994
 
ITT MANUFACTURING ENTERPRISES, INC. (1)
7,292,067 Method and apparatus for buffering bi-directional open drain signal lines 6 2005
 
MICRON TECHNOLOGY, INC. (1)
7,567,107 Reduction of the time for executing an externally commanded transfer of data in an integrated device 0 2007
 
STOVOKOR TECHNOLOGY LLC (1)
5,438,166 Customizable circuitry 50 1992
 
THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (1)
5,596,743 Field programmable logic device with dynamic interconnections to a dynamic logic core 69 1995
 
WISTRON CORPORATION (1)
5,498,976 Parallel buffer/driver configuration between data sending terminal and data receiving terminal 8 1994