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    • 8. 发明授权
    • Data processing apparatus and network relaying apparatus
    • 数据处理装置和网络中继装置
    • US06560233B1
    • 2003-05-06
    • US09266635
    • 1999-03-11
    • Satoshi HatanakaNobuhito MatsuyamaKazuo SugaiYukisada Yamakawa
    • Satoshi HatanakaNobuhito MatsuyamaKazuo SugaiYukisada Yamakawa
    • H04J1226
    • H04L49/3009H04L49/254H04L49/30
    • Each of a plurality of data processing units that form a network relaying apparatus has a memory controller, a network controller, a processor, and independently accessible first and second memories. The memory controller includes a header information register for storing header information such as a header start position in a packet and a header length; a header position detection circuit for detecting a header position in the packet based on the header information contained in the header information register; and an inter-data processing unit transfer circuit for sending and receiving a packet to and from another data processing unit. The data processing unit stores into the first memory a packet received from the network or a packet transferred from another data processing unit, and at the same time stores only a header portion of the packet into the second memory. The processor reads the header portion of the packet from the second memory and analyzes it while at the same time the network controller and the inter-data processing unit transfer circuit write and read another packet to and from the first memory.
    • 形成网络中继装置的多个数据处理单元中的每一个具有存储器控制器,网络控制器,处理器和可独立存取的第一和第二存储器。 存储器控制器包括一个标题信息寄存器,用于存储诸如分组中的报头开始位置和报头长度的报头信息; 标题位置检测电路,用于基于包含在标题信息寄存器中的标题信息来检测分组中的报头位置; 以及用于向和从另一数据处理单元发送和接收分组的数据间处理单元传送电路。 数据处理单元将从网络接收的分组或从另一数据处理单元传送的分组存储到第一存储器中,并且同时仅将分组的报头部分存储到第二存储器中。 处理器从第二存储器读取分组的报头部分并对其进行分析,同时网络控制器和数据间处理单元传送电路向第一存储器写入和读取另一分组。