US Patent No: 5,361,005

Number of patents in Portfolio can not be more than 2000

Configurable driver circuit and termination for a computer input/output bus

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ATTORNEY / AGENT: (SPONSORED)
 

Importance

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Abstract

A configurable driver/termination circuit for use in a peripheral device connected to a computer input/output controller bus. The driver/termination circuit has the pull-up current source characteristics of a three-state driver and the pull-down current sink characteristics of a open collector driver. Logic circuit defines the operating mode. In a default mode, the driver/termination circuit can function in either open collector or three-state bus designs. The circuit mode is changed by command from a host computer to explicitly operate as an open collector driver/terminator, as a three-state driver, or as an inactive high impedance. Alternatively, peripheral devices automatically select the mode which minimizes data transmission errors.

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First Claim

Related Publications

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.HOUSTON, TX25733

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Jedrzejewski, Mark J Thornton, CO 5 88
Norton, Terry W Longmont, CO 2 24
Slattery, John W Fort Collins, CO 6 128

Cited Art

Patent Info (Count) # Cites Year
 
AVAGO TECHNOLOGIES GENERAL IP PTE. LTD. (1)
5,136,185 Local tristate control circuit 19 1991
 
ELPIDA MEMORY, INC. (1)
5,151,621 High speed output buffer unit that preliminarily sets the output voltage level 29 1991
 
RENESAS ELECTRONICS CORPORATION (1)
5,285,119 Semiconductor integrated tri-state circuitry with test means 19 1992
 
SUN MICROSYSTEMS, INC. (1)
5,107,142 Apparatus for minimizing the reverse bias breakdown of emitter base junction of an output transistor in a tristate bicmos driver circuit 15 1990
 
WESTERN DIGITAL TECHNOLOGIES, INC. (1)
4,866,309 Multiplexed bus architecture for configuration sensing 9 1988

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
LEXAR MEDIA, INC. (5)
6,182,162 Externally coupled compact flash memory card that configures itself one of a plurality of appropriate operating protocol modes of a host computer 99 1998
6,385,667 System for configuring a flash memory card with enhanced operating mode detection and user-friendly interfacing system 76 1999
6,721,819 Flash memory card with enhanced operating mode detection and user-friendly interfacing system 35 2001
7,174,445 Flash memory card with enhanced operating mode detection and user-friendly interfacing system 4 2002
7,111,085 Flash memory card with enhanced operating mode detection and user-friendly interfacing system 13 2003
 
SANDISK CORPORATION (5)
6,901,457 Multiple mode communications system 46 1998
6,279,114 Voltage negotiation in a single host multiple cards system 127 1998
7,177,975 Card system with erase tagging hierarchy and group based write protection 10 2001
7,360,003 Multiple mode communication system 6 2005
7,374,108 Write protection and use of erase tags in a single host multiple cards system 2 2007
 
MICRON TECHNOLOGY, INC. (4)
7,421,523 Flash memory card with enhanced operating mode detection and user-friendly interfacing system 0 2005
7,721,017 Methods and apparatus for identifying operating modes for peripheral devices 2 2008
8,073,986 Memory devices configured to identify an operating mode 0 2010
8,291,128 Systems configured to identify an operating mode 0 2011
 
QIMONDA AG (3)
6,209,022 Slave station with two output circuits commonly and directly connected to a line for serially transmitting data to a master station in two operational modes 8 1997
6,189,059 Communications system with a master station and at least one slave station 7 1998
6,937,058 Methods and apparatus for active termination of high-frequency signals 1 2003
 
BIMBA MANUFACTURING COMPANY (1)
5,739,704 Logic selection circuit 13 1996
 
BSQUARE CORPORATION (1)
6,477,611 Field-configurable, adaptable and programmable input/output bus interface and method 13 1999
 
ELECTRONIC SOLUTIONS (1)
7,028,105 Apparatus, method and signal set for monoline serial interface 4 2001
 
HGST NETHERLANDS B.V. (1)
7,436,212 Interface circuit power reduction 1 2004
 
INTEL CORPORATION (1)
5,519,345 Reconfigurable interrupt device and method 12 1995
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (1)
6,134,620 Tri-state bus contention circuit preventing false switching caused by poor synchronization 0 1998
 
MAGNACHIP SEMICONDUCTOR, LTD. (1)
5,680,065 Small computer system interface bus driving circuit with unique enable circuitry 11 1995