Digital video network interface
    4.
    发明授权
    Digital video network interface 失效
    数字视频网络接口

    公开(公告)号:US06438604B1

    公开(公告)日:2002-08-20

    申请号:US09166487

    申请日:1998-10-05

    IPC分类号: G06F1300

    摘要: A digital video network interface for transferring isochronous video data over an asynchronous local area network, including an isochronous interface for transmitting digital video data isochronously, a memory comprising first and second buffers for storing the isochronous video data, a network interface for transmitting video data from either the first or second buffers over the asynchronous local area network, and a memory buffer manager for controlling the output of the video data over the asynchronous local area network and for controlling the input/output of video data into/from the first or second buffers, wherein, when either the first or second buffers is filled with video data, the memory buffer manager shifts the input of data into an empty buffer and begins outputting video data to the asynchronous local area network from a filled buffer, upon receiving access to the local area network. Complementary ones of such video network interfaces may be provided on a network so as to permit one-way video streaming (to one or more receiving sites) or two-way video conferencing with network interfaces operating in full-duplex mode.

    摘要翻译: 一种用于通过异步局域网传输同步视频数据的数字视频网络接口,包括用于同步地传输数字视频数据的同步接口,包括用于存储同步视频数据的第一和第二缓冲器的存储器,用于从 无论是在异步局域网上的第一或第二缓冲器,以及存储器缓冲管理器,用于控制异步局域网上的视频数据的输出,并用于控制视频数据输入/输出到第一或第二缓冲器 ,其中当所述第一或第二缓冲器中的任何一个被视频数据填充时,所述存储器缓冲器管理器将所述数据的输入移动到空的缓冲器中,并且当接收到所述第一或第二缓冲器的访问时,开始从填充的缓冲器向所述异步局域网输出视频数据 局域网。 可以在网络上提供这些视频网络接口的补充,以允许以全双工模式操作的网络接口进行单向视频流(到一个或多个接收站点)或双向视频会议。

    In an interactive network board, a method and apparatus for preventing
inadvertent loading of a programmable read only memory
    5.
    发明授权
    In an interactive network board, a method and apparatus for preventing inadvertent loading of a programmable read only memory 失效
    一种交互式网络板,用于防止无意中加载可编程只读存储器的方法和装置

    公开(公告)号:US5550997A

    公开(公告)日:1996-08-27

    申请号:US978491

    申请日:1992-11-18

    摘要: Method and apparatus for loading a ROM image into PROM comprises loading a ROM image into a dynamic random access memory, verifying the accuracy of the ROM image in the dynamic random access memory, and receiving a command to flash EPROM with the stored ROM image. A hardware interlock mechanism is deactivated by a two-step command procedure so as to enable flashing the EPROM. Specifically, a predetermined bit pattern is written to a first predetermined address on an address bus, one bit being latched to cause a flash signal to be output to a transistor switch and to be pre-loaded at a flip flop. A second predetermined address is read from so as to clock the flip flop. The output of the flip flop closes the transistor switch allowing the flash enable signal to reach the EPROM. The EPROM is erased, after which the ROM image is loaded into the PROM.

    摘要翻译: 将ROM图像加载到PROM中的方法和装置包括将ROM图像加载到动态随机存取存储器中,验证动态随机存取存储器中的ROM图像的精度,以及接收用存储的ROM图像闪存EPROM的命令。 通过两步命令程序禁用硬件互锁机制,以使EPROM闪烁。 具体地,将预定位模式写入地址总线上的第一预定地址,一位被锁存以使闪光信号输出到晶体管开关并在触发器中预加载。 读取第二预定地址以便对触发器进行时钟。 触发器的输出闭合晶体管开关,允许闪光使能信号到达EPROM。 擦除EPROM,然后将ROM映像加载到PROM中。

    Method and apparatus for interfacing a peripheral to a local area network
    6.
    发明授权
    Method and apparatus for interfacing a peripheral to a local area network 失效
    用于将外围设备连接到局域网的方法和装置

    公开(公告)号:US5611046A

    公开(公告)日:1997-03-11

    申请号:US978369

    申请日:1992-11-18

    摘要: Method and apparatus for interfacing a printer to a local area network includes the use of an interactive network board coupling the printer to the LAN. A bi-directional printer interface is disposed on the board and transmits print data to the printer, and receives printer status data from the printer. ALAN interface is disposed on the board for receiving print job information and printer status requests from the LAN, and for transmitting printer status information to the LAN. A ROM is disposed on the board and stores (i) application programs which receive the print job information and transmit the print data to the printer, and (ii) status and control programs which receive the printer status requests from the LAN, receive printer status data from the printer, transmit the printer status information to the LAN, and receive control information from the LAN and transmit it to the printer. A processor disposed on the board executes both the application programs and the status and control programs. Preferably, the application programs are selectively capable of placing the network board into a plurality of different printer configurations.

    摘要翻译: 将打印机连接到局域网的方法和装置包括使用将打印机耦合到LAN的交互网板。 双面打印机接口设置在板上,并将打印数据传送到打印机,并从打印机接收打印机状态数据。 ALAN接口设置在板上用于从LAN接收打印作业信息和打印机状态请求,并将打印机状态信息发送到LAN。 一个ROM被放置在电路板上并存储(i)接收打印作业信息并将打印数据发送到打印机的应用程序,以及(ii)从LAN接收打印机状态请求的状态和控制程序,接收打印机状态 来自打印机的数据,将打印机状态信息发送到LAN,并从LAN接收控制信息并将其传送到打印机。 布置在板上的处理器执行应用程序和状态和控制程序。 优选地,应用程序选择性地能够将网络板放置在多个不同的打印机配置中。