WO2001048613A3 - Emulation of a disconnect of a device - Google Patents

Emulation of a disconnect of a device Download PDF

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Publication number
WO2001048613A3
WO2001048613A3 PCT/EP2000/012619 EP0012619W WO0148613A3 WO 2001048613 A3 WO2001048613 A3 WO 2001048613A3 EP 0012619 W EP0012619 W EP 0012619W WO 0148613 A3 WO0148613 A3 WO 0148613A3
Authority
WO
WIPO (PCT)
Prior art keywords
disconnect
resistor
pull
speed
speed mode
Prior art date
Application number
PCT/EP2000/012619
Other languages
French (fr)
Other versions
WO2001048613A2 (en
Inventor
Zong L Wu
Original Assignee
Koninkl Philips Electronics Nv
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 Koninkl Philips Electronics Nv filed Critical Koninkl Philips Electronics Nv
Priority to EP00990726A priority Critical patent/EP1183611B1/en
Priority to JP2001549199A priority patent/JP2003518892A/en
Priority to DE60033930T priority patent/DE60033930T2/en
Publication of WO2001048613A2 publication Critical patent/WO2001048613A2/en
Publication of WO2001048613A3 publication Critical patent/WO2001048613A3/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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

Abstract

USB 2.0 supports communication in low-speed (LS), full speed (FS) and high speed (HS). In the full speed mode, the wire segment between a hub and a device is terminated via a pull-up resistor (480) on the D+ data line on the downstream end of the segment. In the high-speed mode, both signal wires are terminated by the LS/FS driver (420) generating a single-ended zero via resistors (490). The device emulates a disconnect, while it operates in the high-speed mode, by activating the pull-up resistor (480). Including the D+ pull-up resistor is practically equivalent to an open end, enabling a reliable disconnect detection in the hub using the disconnection envelop detector (460). Detection of an (emulated) disconnect, triggers the reset en enumeration process. This allows the device to report a change in functionality without the user having to physically remove the device from the bus.
PCT/EP2000/012619 1999-12-24 2000-12-13 Emulation of a disconnect of a device WO2001048613A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP00990726A EP1183611B1 (en) 1999-12-24 2000-12-13 Emulation of a disconnect of a device
JP2001549199A JP2003518892A (en) 1999-12-24 2000-12-13 Emulation of device disconnection
DE60033930T DE60033930T2 (en) 1999-12-24 2000-12-13 EMULATION OF A DEVICE SHUTDOWN

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP99204536.9 1999-12-24
EP99204536 1999-12-24

Publications (2)

Publication Number Publication Date
WO2001048613A2 WO2001048613A2 (en) 2001-07-05
WO2001048613A3 true WO2001048613A3 (en) 2001-12-13

Family

ID=8241093

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/012619 WO2001048613A2 (en) 1999-12-24 2000-12-13 Emulation of a disconnect of a device

Country Status (7)

Country Link
US (2) US6791950B2 (en)
EP (1) EP1183611B1 (en)
JP (1) JP2003518892A (en)
CN (1) CN1222891C (en)
DE (1) DE60033930T2 (en)
ES (1) ES2283345T3 (en)
WO (1) WO2001048613A2 (en)

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Also Published As

Publication number Publication date
WO2001048613A2 (en) 2001-07-05
EP1183611B1 (en) 2007-03-14
US20010017846A1 (en) 2001-08-30
JP2003518892A (en) 2003-06-10
CN1364265A (en) 2002-08-14
US7500027B2 (en) 2009-03-03
US20050066087A1 (en) 2005-03-24
DE60033930D1 (en) 2007-04-26
EP1183611A2 (en) 2002-03-06
ES2283345T3 (en) 2007-11-01
US6791950B2 (en) 2004-09-14
DE60033930T2 (en) 2008-01-24
CN1222891C (en) 2005-10-12

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