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    • 3. 发明授权
    • Flow control for universal serial bus (USB)
    • 通用串行总线(USB)流量控制
    • US08200856B2
    • 2012-06-12
    • US11753473
    • 2007-05-24
    • Hongshi GuoJeffrey Alan Dyck
    • Hongshi GuoJeffrey Alan Dyck
    • G06F3/00G06F15/16
    • G06F13/426Y02D10/14Y02D10/151
    • Techniques for performing flow control in Universal Serial Bus (USB) are described. In one design, a USB host sends token packets to a USB device to initiate data exchanges with the USB device. The USB device determines that it is incapable of exchanging data with the USB host, e.g., because there is no data to send or because its buffer is full or near full. The USB device then sends a “flow off” notification to the USB host to suspend data exchanges. The USB host receives the flow off notification and suspends sending token packets to the USB device. Thereafter, the USB device determines that it is capable of exchanging data with the USB host. The USB device then sends a “flow on” notification to the USB host to resume data exchanges. The USB host receives the flow on notification and resumes sending token packets to the USB device.
    • 描述了在通用串行总线(USB)中进行流量控制的技术。 在一种设计中,USB主机向USB设备发送令牌包以发起与USB设备的数据交换。 USB设备确定它不能与USB主机交换数据,例如,因为没有要发送的数据或因为其缓冲器已满或接近满。 然后,USB设备向USB主机发送“流量关闭”通知,以暂停数据交换。 USB主机接收到流量关闭通知,并暂停向USB设备发送令牌数据包。 此后,USB设备确定它能够与USB主机交换数据。 然后,USB设备向USB主机发送“流通”通知,以恢复数据交换。 USB主机通过通知接收流程,并恢复向USB设备发送令牌数据包。
    • 8. 发明授权
    • USB interrupt endpoint sharing
    • USB中断端点共享
    • US07657684B2
    • 2010-02-02
    • US11677845
    • 2007-02-22
    • Hongshi GuoUppinder Singh BabbarJeffrey Alan Dyck
    • Hongshi GuoUppinder Singh BabbarJeffrey Alan Dyck
    • G06F13/24
    • G06F13/426
    • A single USB interrupt endpoint is usable by two different active logical devices in a USB device. If a first logical device is to interrupt a USB host, then the first logical device writes a notification into the endpoint. The notification carries a number that identifies a first device object. If, however, a second logical device is to interrupt the host, then the second logical device writes a notification into the endpoint, but the notification carries a number that identifies a second device object. The USB host reads the notification. In one example, if the number and a Device ID indicate that the notification is for the first object, then the first object processes the notification. If the number and Device ID indicate that the notification is for the second object, then the first object notifies the second object so that the second object processes the notification.
    • 单个USB中断端点可由USB设备中的两个不同的活动逻辑设备使用。 如果第一个逻辑设备要中断一个USB主机,那么第一个逻辑设备将一个通知写入端点。 通知包含识别第一个设备对象的数字。 然而,如果第二逻辑设备要中断主机,则第二逻辑设备将一个通知写入端点,但通知中携带一个识别第二个设备对象的数字。 USB主机读取通知。 在一个示例中,如果号码和设备ID指示该通知是针对第一个对象,则第一个对象处理该通知。 如果号码和设备ID指示通知是针对第二个对象,则第一个对象通知第二个对象,以便第二个对象处理该通知。