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    • 2. 发明授权
    • Universal serial bus peripheral bridge with sequencer
    • 通用串行总线外围桥与定序器
    • US06505267B2
    • 2003-01-07
    • US09812475
    • 2001-03-19
    • David D. LukeDavid C. Gilbert
    • David D. LukeDavid C. Gilbert
    • G06F1300
    • G06F13/385G06F13/4018
    • A Universal Serial Bus to parallel bus bridge includes a Universal Serial Bus port that receives a serial bit stream of data and commands in a Universal Serial Bus protocol from a USB host computer. A parallel bus port on the bridge includes parallel port registers and state machines coupled to a peripheral device. A USB controller core is coupled between the Universal Serial Bus port and the parallel bus port and converts data and commands between the Universal Serial Bus protocol and the parallel bus protocol. A sequencer is coupled between the USB controller core and the parallel bus port. A sequence of sequencer commands is loaded into memory in the USB bridge and used by the sequencer to perform a sequence of parallel port operations. The sequencer performs the commands autonomously without intervention from the USB host computer. Because the host computer does not have to initiate a USB transaction for each individual parallel port operation, the sequence of operations is completed in a shorter amount of time.
    • 通用串行总线到并行总线桥接器包括通用串行总线端口,其通过USB主机从通用串行总线协议接收数据和命令的串行比特流。 桥上的并行总线端口包括并行端口寄存器和耦合到外围设备的状态机。 USB控制器核心耦合在通用串行总线端口和并行总线端口之间,并在通用串行总线协议和并行总线协议之间转换数据和命令。 定序器耦合在USB控制器核心和并行总线端口之间。 定序器命令序列被加载到USB桥中的存储器中,并由定序器用于执行并行端口操作的顺序。 定序器自动执行命令,无需USB主机的干预。 由于主计算机不必为每个单独的并行端口操作启动USB事务,所以操作顺序在较短的时间内完成。
    • 4. 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
    • Universal serial bus peripheral bridge with sequencer
    • 通用串行总线外围桥与定序器
    • US06233640B1
    • 2001-05-15
    • US09273310
    • 1999-03-19
    • David D. LukeDavid C. Gilbert
    • David D. LukeDavid C. Gilbert
    • G06F1300
    • G06F13/385G06F13/4018
    • A Universal Serial Bus to parallel bus bridge includes a Universal Serial Bus port that receives a serial bit stream of data and commands in a Universal Serial Bus protocol from a USB host computer. A parallel bus port on the bridge includes parallel port registers and state machines coupled to a peripheral device. A USB controller core is coupled between the Universal Serial Bus port and the parallel bus port and converts data and commands between the Universal Serial Bus protocol and the parallel bus protocol. A sequencer is coupled between the USB controller core and the parallel bus port. A sequence of sequencer commands is loaded into memory in the USB bridge and used by the sequencer to perform a sequence of parallel port operations. The sequencer performs the commands autonomously without intervention from the USB host computer. Because the host computer does not have to initiate a USB transaction for each individual parallel port operation, the sequence of operations is completed in a shorter amount of time.
    • 通用串行总线到并行总线桥接器包括通用串行总线端口,其通过USB主机从通用串行总线协议接收数据和命令的串行比特流。 桥上的并行总线端口包括并行端口寄存器和耦合到外围设备的状态机。 USB控制器核心耦合在通用串行总线端口和并行总线端口之间,并在通用串行总线协议和并行总线协议之间转换数据和命令。 定序器耦合在USB控制器核心和并行总线端口之间。 定序器命令序列被加载到USB桥中的存储器中,并由定序器用于执行并行端口操作的顺序。 定序器自动执行命令,无需USB主机的干预。 由于主计算机不必为每个单独的并行端口操作启动USB事务,所以操作顺序在较短的时间内完成。