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    • 7. 发明授权
    • System and method for automatic retry of transmit, independent of a host
processor, after an underrun occurs in a LAN
    • 在LAN发生欠载之后,独立于主处理器的自动重试发送的系统和方法
    • US6137804A
    • 2000-10-24
    • US982726
    • 1997-12-02
    • Samuel Steven AllisonKenneth James BarkerSteven Howard JohnsonJoseph Kinman Lee
    • Samuel Steven AllisonKenneth James BarkerSteven Howard JohnsonJoseph Kinman Lee
    • H04L12/413H04L12/56H04L12/28
    • H04L49/9031H04L49/90H04L49/901H04L12/40032H04L12/40195
    • In a local area network, a system and a method to detect transmit underruns and retransmit frames between a sending station and a receiving station using a Media Access Control (MAC) device in lieu of a sending processor. The MAC device includes a MAC processor for transmitting data in blocks from a host buffer to a storage device, e.g., RAM for retransmission to the network via a Media Independent Interface (MII) unit. The MAC device includes a transmit logic unit which uses a control word set by the MAC processor to transmit data by frames from the storage device to the network. The transmit logic unit includes pointer control logic to identify the start address of the data and to track the data as read from the storage device to the network. When a transmit underrun occurs, the transmit logic recognizes the condition and resets the pointer logic to the start of the first frame for retransmission to the receiving station. During retransmission, the MAC processor continues to transfer data from the sending system to the storage device which eventually provides sufficient data to overcome the underrun condition. A frame is repeated if a underrun condition continues until the frame is transmitted without an underrun condition which eliminates the retransmission request of the receiving station to the sending station. The MAC device enables underruns to be transparent to the sending and receiving station.
    • 在局域网中,使用媒体访问控制(MAC)设备代替发送处理器来检测发送站和接收站之间的发送欠载和重传帧的系统和方法。 MAC设备包括MAC处理器,用于以块的形式从主机缓冲器向存储设备(例如RAM)发送数据,以经由媒体独立接口(MII)单元向网络重传。 MAC设备包括发送逻辑单元,其使用由MAC处理器设置的控制字从存储设备向网络发送数据。 发送逻辑单元包括指示器控制逻辑,用于识别数据的起始地址并且跟踪从存储设备读取到网络的数据。 当发生发生欠载时,发送逻辑识别该条件,并将指针逻辑复位到第一帧的开始,以重传到接收站。 在重传期间,MAC处理器继续将数据从发送系统传送到存储设备,最终提供足够的数据来克服欠载状况。 如果欠载条件持续,直到发送帧而没有欠载条件,则重复帧,消除了发送站的接收站的重传请求。 MAC设备使得欠发送对于发送和接收站是透明的。