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AU2002239499A1 - Method and apparatus for communicating with a host - Google Patents

Method and apparatus for communicating with a host

Info

Publication number
AU2002239499A1
AU2002239499A1 AU2002239499A AU3949902A AU2002239499A1 AU 2002239499 A1 AU2002239499 A1 AU 2002239499A1 AU 2002239499 A AU2002239499 A AU 2002239499A AU 3949902 A AU3949902 A AU 3949902A AU 2002239499 A1 AU2002239499 A1 AU 2002239499A1
Authority
AU
Australia
Prior art keywords
resistor
smart card
pull
voltage
host
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
AU2002239499A
Inventor
Given Not
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STMicroelectronics lnc USA
Original Assignee
STMicroelectronics lnc USA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by STMicroelectronics lnc USA filed Critical STMicroelectronics lnc USA
Publication of AU2002239499A1 publication Critical patent/AU2002239499A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/40—Bus structure
    • G06F13/4063—Device-to-bus coupling
    • G06F13/4068—Electrical coupling
    • G06F13/4086—Bus impedance matching, e.g. termination

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Information Transfer Systems (AREA)
  • Small-Scale Networks (AREA)
  • Logic Circuits (AREA)
  • Credit Cards Or The Like (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Selective Calling Equipment (AREA)
  • Power Sources (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Abstract

A method and apparatus is disclosed for communicating with a host. In one embodiment, a smart card has an IC with voltage conditioning circuitry and a pull-up resistor. The smart card, when inserted in a smart card reader coupled to the host, is capable of signaling the host over a bus using the pull-up resistor selectively coupled to a voltage output of the voltage conditioning circuitry and a first output of the smart card. The voltage conditioning circuitry output is selectively coupled to the first output through the resistor, responsive to the device being powered by the bus but not transmitting. This tends to pull up the first output to the voltage level of the voltage source, which makes the smart card capable of being properly detected by the host upon the bus being driven by a host. Selectively disconnecting the pull-up resistor while the smart card is transmitting or receiving results in a more balanced differential output signal. Since the pull-up resistor and voltage conditioning circuitry supplying the proper voltage to the pull-up resistor are an integrated part of the IC, no separate contact is required to supply voltage to the resistor. This permits the smart card to be compatible with the contact configuration of certain existing smart cards, and eliminates a need for the pull-up resistor or voltage conditioning circuitry to be included in the smart card reader.
AU2002239499A 2000-12-04 2001-12-03 Method and apparatus for communicating with a host Abandoned AU2002239499A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/729,113 2000-12-04
US09/729,113 US6543690B2 (en) 2000-12-04 2000-12-04 Method and apparatus for communicating with a host
PCT/US2001/046289 WO2002046936A2 (en) 2000-12-04 2001-12-03 Method and apparatus for communicating with a host

Publications (1)

Publication Number Publication Date
AU2002239499A1 true AU2002239499A1 (en) 2002-06-18

Family

ID=24929641

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2002239499A Abandoned AU2002239499A1 (en) 2000-12-04 2001-12-03 Method and apparatus for communicating with a host

Country Status (10)

Country Link
US (1) US6543690B2 (en)
EP (1) EP1342163B1 (en)
JP (1) JP3988931B2 (en)
KR (1) KR100798496B1 (en)
CN (1) CN100483379C (en)
AT (1) ATE472137T1 (en)
AU (1) AU2002239499A1 (en)
DE (1) DE60142447D1 (en)
ES (1) ES2350392T3 (en)
WO (1) WO2002046936A2 (en)

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Also Published As

Publication number Publication date
ATE472137T1 (en) 2010-07-15
WO2002046936A3 (en) 2003-02-27
EP1342163B1 (en) 2010-06-23
EP1342163A2 (en) 2003-09-10
CN1486464A (en) 2004-03-31
KR20030078060A (en) 2003-10-04
US20020066791A1 (en) 2002-06-06
ES2350392T3 (en) 2011-01-21
DE60142447D1 (en) 2010-08-05
WO2002046936A8 (en) 2003-09-04
WO2002046936A2 (en) 2002-06-13
JP3988931B2 (en) 2007-10-10
JP2004515858A (en) 2004-05-27
US6543690B2 (en) 2003-04-08
KR100798496B1 (en) 2008-01-28
CN100483379C (en) 2009-04-29

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