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    • 2. 发明授权
    • Universal serial bus peripheral bridge simulates a device disconnect condition to a host when the device is in a not-ready condition to avoid wasting bus resources
    • 当设备处于未就绪状态时,通用串行总线外围桥模拟主机的设备断开状态,以避免浪费总线资源
    • US06279060B1
    • 2001-08-21
    • US09205558
    • 1998-12-04
    • David D. LukeEric J. LuttmannRonald J. RichterDavid C. Gilbert
    • David D. LukeEric J. LuttmannRonald J. RichterDavid C. Gilbert
    • G06F1310
    • G06F13/385G06F2213/4002
    • A Universal Serial Bus (USB) peripheral bridge and method for operation are disclosed. The bridge simulates a device disconnect condition to its upstream USB hub or host, even though it remains connected and powered, when its associated peripheral is not ready to communicate, powered off, or physically disconnected. For an IEEE-1284-1994 peripheral connection, the bridge senses the condition of the PLH peripheral line. If the PLH line is deasserted or floating, the bridge simulates a device disconnect condition by either allowing its upstream hub or host to take the D+ data line low, or taking the line low itself. By not allowing itself to be enumerated on the USB unless its associated peripheral is ready, the bridge avoids confusion at the host and wasted bus resources. At the same time, the bridge may remain physically connected to the host regardless of the state of the peripheral, even if the bridge is powered from the host.
    • 公开了一种通用串行总线(USB)外围桥及其操作方法。 即使连接和供电,当其相关的外围设备尚未准备好进行通信,断电或物理断开连接时,该桥接模拟其上游USB集线器或主机的设备断开连接状态。 对于IEEE-1284-1994外设连接,桥接器检测PLH外设线的状态。 如果PLH线路断开或浮动,桥接器可以通过允许其上游集线器或主机将D +数据线置于低电平或使线路自身低电平来模拟设备断开连接状态。 通过不允许自己在USB上枚举,除非其相关的外围设备已经准备就绪,桥接器可以避免主机混淆,浪费总线资源。 同时,即使桥接从主机供电,桥接器也可以保持与主机的物理连接,而不管外设的状态如何。
    • 5. 发明授权
    • USB device communication
    • USB设备通讯
    • US07080189B1
    • 2006-07-18
    • US10160442
    • 2002-05-31
    • Eric J. Luttmann
    • Eric J. Luttmann
    • G06F13/20
    • G06F13/385G06F13/426
    • A method of communicating between a host and a USB-connected device is provided, in which a first and second phase of a communications protocol are asynchronously transmitted between the host and the device. A third phase of the communications protocol can also be asynchronously transmitted with the first and second phases. The USB-connected device can be a mass storage device and the communications protocol can be a bulk-only transport protocol having a command phase, a data phase, and a status phase.
    • 提供了一种在主机和USB连接设备之间通信的方法,其中在主机和设备之间异步地传送通信协议的第一和第二阶段。 通信协议的第三阶段也可以与第一阶段和第二阶段异步传输。 USB连接设备可以是大容量存储设备,并且通信协议可以是具有命令阶段,数据阶段和状态阶段的仅批量传输协议。