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    • 22. 发明授权
    • Information processing apparatus and method and storage medium
    • 信息处理装置及方法及存储介质
    • US06771668B2
    • 2004-08-03
    • US09062503
    • 1998-04-20
    • Koji FukunagaKiyoshi Katano
    • Koji FukunagaKiyoshi Katano
    • G06F1336
    • H04L12/40058H04L12/40117H04L12/6418
    • A host device logs in a printer as a print data transfer destination to acquire type information of the printer and issues SB_CONT.req to determine whether a cycle master necessary for isochronous transfer is present on a serial bus. The print data transfer mode and transfer parameter are set in accordance with the presence/absence of the cycle master and the acquired type information. If the cycle master is present on the serial bus, isochronous transfer is set as the transfer mode; otherwise, asynchronous transfer is set as the transfer mode. Therefore, even when devices without any cycle master function are connected, or no cycle master is present on the bus, print data can be transferred from the host device to the printer.
    • 主机设备登录打印机作为打印数据传输目的地以获取打印机的类型信息,并发出SB_CONT.req以确定串行总线上是否存在等时传输所需的循环主机。 打印数据传送模式和传送参数根据循环主控器的存在/不存在以及所获取的类型信息来设置。 如果串行总线上存在循环主机,则将同步传输设置为传输模式; 否则,将异步传​​输设置为传输模式。 因此,即使连接了没有任何循环主站功能的设备,或者总线上没有循环主站,打印数据可以从主机设备传输到打印机。
    • 23. 发明授权
    • Data transmission apparatus, system and method, and recording medium
    • 数据传输装置,系统和方法以及记录介质
    • US06717694B1
    • 2004-04-06
    • US09362892
    • 1999-07-29
    • Koji FukunagaMakoto Kobayashi
    • Koji FukunagaMakoto Kobayashi
    • G06F1500
    • H04N1/00278G06F3/1205G06F3/1236G06F3/128H04N1/32448H04N2201/0015H04N2201/0041H04N2201/0049H04N2201/0084
    • In data transmission between a host device and a target device connected by a serial bus, when commands and data use the same register area, and only the transmission result of the data is to be returned, any command other than a data transmission command cannot be transmitted for a certain period because the receiving-side register becomes full. In this invention, when a response to a data transmission command from the host device is to be returned from the target device, the host device is notified of the situation of the data receiving buffer. The host device transmits a DUMMY command to the target device in accordance with the free buffer situation and transmits another command to the target device in accordance with the response from the target device. The target device sends a data retransmission request to the host device in accordance with the free buffer situation. The host device retransmits a data transmission command in accordance with the retransmission request and transmits another command to the target device in accordance with the response from the target device.
    • 在通过串行总线连接的主机设备和目标设备之间的数据传输中,当命令和数据使用相同的寄存器区域时,只返回数据的传输结果,除数据传输命令之外的任何命令都不能 由于接收端寄存器已满,因此发送一段时间。 在本发明中,当从目标设备返回对来自主机设备的数据传输命令的响应时,向主机设备通知数据接收缓冲器的状况。 主机设备根据空闲缓冲器情况向目标设备发送DUMMY命令,并根据来自目标设备的响应向目标设备发送另一命令。 目标设备根据自由缓冲区情况向主机设备发送数据重发请求。 主机设备根据重传请求重传数据传输命令,并根据目标设备的响应向目标设备发送另一命令。