WO2002065264A1 - Power managing in a system having internal usb hub - Google Patents

Power managing in a system having internal usb hub Download PDF

Info

Publication number
WO2002065264A1
WO2002065264A1 PCT/US2001/047259 US0147259W WO02065264A1 WO 2002065264 A1 WO2002065264 A1 WO 2002065264A1 US 0147259 W US0147259 W US 0147259W WO 02065264 A1 WO02065264 A1 WO 02065264A1
Authority
WO
WIPO (PCT)
Prior art keywords
usb
connector
hub
host
attach
Prior art date
Application number
PCT/US2001/047259
Other languages
English (en)
French (fr)
Inventor
Mark Evan Cohen
James Christopher Loebach
Carl Joseph Muti, Jr.
Thomas Wayne Studwell
Osamu Yamamoto
Original Assignee
International Business Machines Corporation
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
Priority claimed from US09/802,659 external-priority patent/US6928562B2/en
Application filed by International Business Machines Corporation filed Critical International Business Machines Corporation
Priority to EP01273738A priority Critical patent/EP1360571A4/en
Priority to PL362602A priority patent/PL205182B1/pl
Priority to JP2002564719A priority patent/JP3810368B2/ja
Priority to KR10-2003-7009350A priority patent/KR100523417B1/ko
Priority to HU0302769A priority patent/HUP0302769A3/hu
Publication of WO2002065264A1 publication Critical patent/WO2002065264A1/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
    • G06F13/4081—Live connection to bus, e.g. hot-plugging
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power

Definitions

  • the present invention relates to computer systems, and more particularly to a method and system for managing power in a system having an internal USB hub.
  • FIG. 1 depicts a conventional computer system 10 that has USB connectors.
  • the conventional computer system 10 could be a number of computer systems, including for example, a notebook computer or desk top computer.
  • the conventional computer system 10 includes a host 12, a first USB connector 14, a USB hub 16, USB connectors 18 and 20 and a power supply 22.
  • the host 12 includes the integrated circuits and, therefore, the processor (not explicitly shown) that operate the operating system (not explicitly shown) for the computer system 10.
  • the host 12 might include four INTELTM integrated circuits.
  • the host 12 might include
  • the conventional computer system 10 also includes the USB connector 14.
  • the conventional computer system 10 could include another USB connector (not explicitly shown) and operate as desired. Due to the popularity of USB connectivity, the conventional computer system 10 is desired to have a larger number of USB connectors. Consequently, the USB hub
  • USB hub 16 that connects the host 12 to USB connectors 18 and 20 is provided.
  • the USB hub 16 allows additional USB connectors 18 and 20 to be integrated into the computer system 10.
  • the USB hub may connected to and be supplied with power from the power supply 22.
  • the conventional computer system 10 includes the components 12, 14, 16, 18, 20 and 22 integrated into a housing.
  • the conventional computer system 10 functions, one of ordinary skill in the art will readily realize the conventional computer system 10 may use a higher amount of power than desired.
  • a USB device attached to a USB connector precludes the processor from entering a lowest power state, known as a C3 state.
  • the operating system for the host 12 detects the presence of a USB device then the processor cannot enter its lowest power state.
  • the operating system in the host 12 considers the USB hub 16, which is integrated into the conventional computer system 10, to be a USB device.
  • the conventional computer system 10 may, therefore, consume more power than is desirable.
  • the conventional computer system 10 is a computer system, such as a notebook, that has a mobile mode.
  • the power supply 22 includes a battery for supplying power to the conventional computer system 10 when in mobile mode.
  • the battery When in the mobile mode, it is desirable to allow the host 12 to enter a lowest power state in order to conserve battery power, for example when the host 12 is not actively being used. Because the processors in the host 12 cannot enter the lowest power state, the battery will discharge more rapidly. The battery may lose its charge, preventing the user from utilizing the conventional computer system 10 when desired.
  • the present invention provides a method and system for managing power in a computer system.
  • the computer system includes a host.
  • the method and system comprise providing a Universal Serial Bus (USB) hub, at least one USB connector and attach/removal detection logic.
  • the at least one USB connector is coupled with the USB hub.
  • the attach/removal detection logic is coupled with the USB hub.
  • the attach/removal detection logic determines whether a USB device is connected to the at least one USB connector, logically decouples the USB hub from the host if the USB device is not connected to the at least one USB connector and logically couples the USB hub to the host if the USB device is connected to the at least one USB connector.
  • the present invention allows power to be managed in the computer system by allowing processors in the host to go to a lower power state.
  • FIG. 1 is a block diagram of a conventional computer system having a USB hub.
  • Figure 2 is a block diagram of one embodiment of a computer system in accordance with the present invention having a USB hub.
  • Figure 3 is a block diagram of a second embodiment of a computer system in accordance with the present invention having a USB hub.
  • FIG. 4 is a more detailed block diagram of the second embodiment of a computer system in accordance with the present invention having a USB hub.
  • the present invention relates to an improvement in computer systems.
  • the following description is presented to enable one of ordinary skill in the art to make and use the invention and is provided in the context of a patent application and its requirements.
  • Various modifications to the preferred embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments.
  • the present invention is not intended to be limited to the embodiment shown, but is to be accorded the widest scope consistent with the principles and features described herein.
  • a conventional computer system may include a host, a USB hub and multiple USB connectors integrated into a single unit.
  • the host typically includes one or more integrated circuits, including at least one processor, that run an operating system
  • USB hub is coupled with the host. Coupled to the USB hub are multiple USB connectors that allow USB devices to be coupled to the conventional computer system. Although such a conventional computer system allows a larger number of USB devices to be used with the conventional computer system, one of ordinary skill in the art will realize that the conventional computer system may not be able to adequately manage power. In particular, the conventional computer system, as required by USB specifications, considers the USB hub to be a USB device connected to the conventional computer system. Consequently, processors in the host of the conventional computer system cannot enter certain power states. As a result, the conventional computer system may consume more power than is desired.
  • the present invention provides a method and system for managing power in a computer system.
  • the computer system includes a host.
  • the method and system comprise providing a Universal Serial Bus (USB) hub, at least one USB connector and attach/removal detection logic.
  • the at least one USB connector is coupled with the USB hub.
  • the attach/removal detection logic is coupled with the USB hub.
  • the attach/removal detection logic determines whether a USB device is connected to the at least one USB connector, logically decouples the USB hub from the host if the USB device is not connected to the at least one USB connector and logically couples the
  • USB hub to the host if the USB device is connected to the at least one USB connector.
  • FIG. 2 is a high-level block diagram that depicts one embodiment of a computer system 100 in accordance with the present invention.
  • the computer system 100 includes a host 102, a first USB connector 104, a USB hub 106, USB connectors 108 and 110 connected to the USB hub 106, a power supply 112 coupled with the USB hub 106, attach/removal detection logic 120 and connector 122.
  • the host 102, the first USB connector 104, the USB hub 106, the USB connectors 108 and 110 and the power supply 112 are preferably substantially the same as the host 12, the first USB connector 14, the USB hub 16, the USB connectors 18 and 20 and the power supply 22 of the conventional system 10 depicted in Figure 1.
  • the attach/removal detection logic 120 is coupled with the USB connectors 108 and 110 and with the power supply 112 and USB hub 108 through the connector 122.
  • the attach/removal detection logic 120 detects whether a USB device (not shown) is plugged into either of the USB connectors 108 and 110.
  • the attach/removal detection logic 120 functions to logically decouple the USB hub 106 from the host 102 if a USB device is not connected any of the USB connectors 108 and 110.
  • the attach removal detection logic 120 also logically couples the USB hub 106 to the host 102 if a USB device is coupled to any of the USB connectors 108 and 110.
  • the attach/removal detection logic 120 does this by controlling the connector 122.
  • the attach/removal detection logic 120 controls the connector 122 so that the connector 122 couples the USB hub 106 to the power supply 112 when a USB device is coupled to either of the USB connectors 108 and 110 and so that the connector 122 does not couple the USB hub 106 to the power supply 112 when the USB device is not coupled to either of the USB connectors 108 and 110.
  • power is only supplied to the USB hub 106 when one or more of the USB connectors 108 and 110 provided through the USB hub 106 is in use.
  • the computer system 100 can better manage power.
  • the operating system of the host 102 can only recognize the USB hub 106 if power is supplied to the USB hub 106. Because the attach/removal detection logic 120 and the connector 122 ensure that the power supply 112 is connected to the USB hub 106 only when one or more of the USB connectors 108 and 110, the operating system can only recognize the USB hub 106 when a USB device is connected to one or more of the USB connectors 108 and 110. In other words, the USB hub 106 is logically decoupled from the host 102 when a USB device is not coupled to either of the USB connectors 108 and 110.
  • the USB hub 106 is logically coupled to the host when a USB device is connected to one or more of the USB connectors 108 and 1 10. This is true even though the USB hub 106 remains physically connected to the host 102 at all times.
  • the operating system for the host 102 only considers the USB hub 106 to be a USB device coupled to the host 102 when one or more of the USB connectors 108 and 110 are in use. When these connectors are not in use, therefore, the processors for the host 102 can enter a lowest power state. Thus, power will not be utilized unnecessarily due to the presence of the USB hub 106. Therefore, power for the computer system 100 can be better managed.
  • FIG. 3 is a block diagram of a second embodiment of a computer system 100' in accordance with the present invention having a USB hub.
  • the computer system 100' includes analogous components to those in the computer system 100. Consequently, these items are labeled similarly. However, for clarity, certain components are not depicted.
  • the computer system 100' includes a host 102', a USB connector 104' connected to the host 102', a USB hub 106', and USB connectors 108' and 110' coupled to the USB hub 106'.
  • the computer system 100' also includes attach/removal detection logic 120' and connector 122'. However, in the computer system 100', the connector 122' is coupled between the host 102' and the USB hub 106'.
  • the attach/removal detection logic 120' still logically decouples the USB hub 106' from the host 102' if a USB device is not connected any of the USB connectors 108' and 110'.
  • the attach/removal detection logic 120' also logically couples the
  • the attach/removal detection logic 120' performs these functions by controlling the connector 122'.
  • the attach/removal detection logic 120' controls the connector 122' so that the connector 122' couples the USB hub 106' to the host 102' when a USB device is coupled to either of the USB connectors 108' and 110'.
  • the attach/removal detection logic 120' controls the 122' so that the connector 122' does not couple the USB hub 106' to the host 102' when the USB device is not coupled to either of the USB connectors 108' and 110'.
  • the computer system 100' can better manage power.
  • the operating system of the host 102' can only recognize the USB hub 106' if the host 102' is coupled to the USB hub 106'. Because the attach/removal detection logic 120' and the connector 122' couples the USB hub 106' to the host 102' only when one or more of the USB connectors 108' and 110', the operating system can only recognize the USB hub 106 when a USB device is connected to one or more of the USB connectors 108' and 110'. In other words, the USB hub 106' is logically decoupled from the host when a USB device is not coupled to either of the USB connectors 108' and 110'.
  • the USB hub 106' is logically coupled to the host when a USB device is connected to one or more of the USB connectors 108' and 110'.
  • the operating system for the host 102' only considers the USB hub 106' to be a USB device coupled to the host 102' when one or more of the USB connectors 108' and 110' are in use.
  • the processors for the host 102' can enter a lowest power state.
  • power will not be utilized unnecessarily due to the presence of the USB hub 106'. Therefore, power for the computer system 100' can be better managed.
  • FIG 4 is a more detailed block diagram of the second embodiment of a computer system 100" in accordance with the present invention having a USB hub 106".
  • the computer system 100" includes analogous components to those in the computer system 100. Consequently, these items are labeled similarly. However, for clarity, certain components are not depicted.
  • the computer system 100" includes processors 102' ' which would reside in a host for the computer system 100", a USB hub 106", USB connectors 108" and 110".
  • the computer system 100" also includes attach/removal detection logic 120" and connector 122".
  • the computer system 100" includes a transient suppressor 124.
  • the transient suppressor 124 is used to prevent damage due to electrostatic discharge when a USB device (not shown) is hot attached to one of the connectors 106' ' and 108" .
  • the attach removal detection logic includes integrated circuits 126 and 128 and logic gates 130, 132 and 134.
  • the connector 122" is a FET.
  • the connector 122" is not a connector in the traditional sense of the word in that the connector 122" does not physically decouple the USB hub 106" from the processors 102".
  • the connector 122" is a connector in the sense that it allows the USB hub 106" to be logically coupled or decoupled from the processor 102".
  • the attach/removal detection logic 120" When a USB device is connected to a USB connector 108" or 110", the attach/removal detection logic 120" provides a signal (H8USBON) that is on. When this signal is on, the FET 122" is turned on. Thus, the line 121 between the processors 102" and the USB hub 106" is driven high when a USB device is connected to one of the connectors 108 " or 110" . As a result, the USB hub 106" is connected to the processors 102" only when the USB connector 108" or 110" is in use. Thus, the processors 102" only recognize the USB hub 106" as a USB device when the USB connector 108" or 110" is being used.
  • the processors 102" behave as though the USB hub 106" is not present in the computer system 100". Therefore, the processors 102" can enter a lowest power state when the USB connectors 108' ' and 110" are not in use. Thus, power can be better managed in the computer system 100".
  • the invention has an application to managing the requirement for power in an electrical system of communication.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Power Sources (AREA)
PCT/US2001/047259 2001-01-18 2001-12-11 Power managing in a system having internal usb hub WO2002065264A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP01273738A EP1360571A4 (en) 2001-01-18 2001-12-11 POWER MANAGEMENT IN A SYSTEM WITH INTERNAL USB DISTRIBUTOR
PL362602A PL205182B1 (pl) 2001-01-18 2001-12-11 Układ do zarządzania mocą zasilania w systemie z wewnętrznym koncentratorem USB
JP2002564719A JP3810368B2 (ja) 2001-01-18 2001-12-11 内部ｕｓｂハブを有するシステムで電力を管理する方法およびシステム
KR10-2003-7009350A KR100523417B1 (ko) 2001-01-18 2001-12-11 내장형 ｕｓｂ 허브를 구비한 시스템의 전력 관리
HU0302769A HUP0302769A3 (en) 2001-01-18 2001-12-11 Method and system for managing power in a computer system

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US26300701P 2001-01-18 2001-01-18
US60/263,007 2001-01-18
US09/802,659 2001-03-09
US09/802,659 US6928562B2 (en) 2001-03-09 2001-03-09 Method and system for managing power in a system having an internal USB HUB

Publications (1)

Publication Number Publication Date
WO2002065264A1 true WO2002065264A1 (en) 2002-08-22

Family

ID=26949608

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/047259 WO2002065264A1 (en) 2001-01-18 2001-12-11 Power managing in a system having internal usb hub

Country Status (9)

Country Link
EP (1) EP1360571A4 (pl)
JP (1) JP3810368B2 (pl)
KR (1) KR100523417B1 (pl)
CN (1) CN1256643C (pl)
CZ (1) CZ20031965A3 (pl)
HU (1) HUP0302769A3 (pl)
PL (1) PL205182B1 (pl)
TW (1) TWI222553B (pl)
WO (1) WO2002065264A1 (pl)

Cited By (8)

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WO2005062157A1 (ja) * 2003-12-19 2005-07-07 Kabushiki Kaisha Toshiba 電子機器、ユニット駆動装置およびユニット駆動装置のインタフェース制御方法
GB2425861A (en) * 2005-04-29 2006-11-08 Sigmatel Inc Changing the power configuration of a USB device
GB2414093B (en) * 2004-05-10 2007-01-17 Sony Computer Entertainment Inc Portable terminal and usb device
US7200744B2 (en) 2002-11-14 2007-04-03 Lg Electronics Inc. Apparatus and method for controlling device operation in computer
KR100787886B1 (ko) * 2003-03-24 2007-12-27 후지필름 가부시키가이샤 호스트/펑션장치
US7779195B2 (en) 2005-06-10 2010-08-17 Kabushiki Kaisha Toshiba Communication control apparatus for common bus connection devices
US8941361B2 (en) 2010-05-25 2015-01-27 Samsung Electronics Co., Ltd. Computer system and control method thereof
CN104881082A (zh) * 2014-02-27 2015-09-02 起源技术美国股份有限公司 具有移动usb端口的平板电脑壳

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JP5016783B2 (ja) 2004-08-11 2012-09-05 株式会社東芝 情報処理装置およびその電源制御方法
KR101145542B1 (ko) 2004-10-27 2012-05-15 엘지전자 주식회사 전원관리 장치 및 방법
KR100763948B1 (ko) * 2005-07-12 2007-10-05 삼성전자주식회사 Ｕｓｂ허브를 갖는 디스플레이장치
JP2007156921A (ja) * 2005-12-06 2007-06-21 Y E Data Inc Ｕｓｂデバイス装置の異常検出・回復システム、異常検出・回復プログラム、異常検出・回復プログラムを記録した記録媒体及び異常検出・回復方法。
US7849334B2 (en) * 2006-09-29 2010-12-07 Intel Coporation Transitioning a computing platform to a low power system state
JP2009009337A (ja) * 2007-06-27 2009-01-15 Sharp Corp 信号処理装置、および、信号処理装置における省電力化方法
TW201015286A (en) * 2008-10-02 2010-04-16 Alcor Micro Corp Bridging device with power-saving function
KR100932481B1 (ko) * 2009-04-24 2009-12-17 손청하 유에스비 전원 공급 장치 및 그 방법
CN102193613A (zh) * 2010-03-09 2011-09-21 张乃千 电子装置的节能省电控制方法
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TW201329731A (zh) * 2012-01-06 2013-07-16 Ite Tech Inc 用於識別通用串列匯流排（ｕｓｂ）和移動高解析度鏈接（ｍｈｌ）設備的一種裝置和其方法
CN104461992B (zh) * 2014-10-31 2018-07-06 苏州达方电子有限公司 电子装置
IT201900005822A1 (it) 2019-04-15 2020-10-15 Phoenix Ict S R L S Adattore di periferiche general purpose per computer
CN111309660B (zh) * 2020-02-17 2021-07-09 深圳市普威技术有限公司 主机设备、终端设备及数据交互系统

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Cited By (12)

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US7200744B2 (en) 2002-11-14 2007-04-03 Lg Electronics Inc. Apparatus and method for controlling device operation in computer
KR100787886B1 (ko) * 2003-03-24 2007-12-27 후지필름 가부시키가이샤 호스트/펑션장치
WO2005062157A1 (ja) * 2003-12-19 2005-07-07 Kabushiki Kaisha Toshiba 電子機器、ユニット駆動装置およびユニット駆動装置のインタフェース制御方法
GB2414093B (en) * 2004-05-10 2007-01-17 Sony Computer Entertainment Inc Portable terminal and usb device
US7895384B2 (en) 2004-05-10 2011-02-22 Sony Computer Entertainment Inc. Portable terminal and USB device
US8250274B2 (en) 2004-05-10 2012-08-21 Sony Computer Enterainment Inc. Portable terminal and USB device
GB2425861A (en) * 2005-04-29 2006-11-08 Sigmatel Inc Changing the power configuration of a USB device
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GB2425861B (en) * 2005-04-29 2009-08-12 Sigmatel Inc System and method for accessing universal serial bus networks
US7779195B2 (en) 2005-06-10 2010-08-17 Kabushiki Kaisha Toshiba Communication control apparatus for common bus connection devices
US8941361B2 (en) 2010-05-25 2015-01-27 Samsung Electronics Co., Ltd. Computer system and control method thereof
CN104881082A (zh) * 2014-02-27 2015-09-02 起源技术美国股份有限公司 具有移动usb端口的平板电脑壳

Also Published As

Publication number Publication date
JP2004521419A (ja) 2004-07-15
TWI222553B (en) 2004-10-21
KR100523417B1 (ko) 2005-10-25
CN1578941A (zh) 2005-02-09
HUP0302769A2 (hu) 2003-11-28
JP3810368B2 (ja) 2006-08-16
CN1256643C (zh) 2006-05-17
CZ20031965A3 (cs) 2003-11-12
EP1360571A4 (en) 2009-03-04
PL362602A1 (pl) 2004-11-02
EP1360571A1 (en) 2003-11-12
KR20030070915A (ko) 2003-09-02
HUP0302769A3 (en) 2005-08-29
PL205182B1 (pl) 2010-03-31

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