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12. 发明申请

WO0186409A3 SYSTEM AND METHOD FOR CONTROLLING READOUT OF FRAME DATA FROM BUFFER 审中-公开
标题翻译：用于控制从缓冲器读取帧数据的系统和方法
公开(公告)号：WO0186409A3
公开(公告)日：2002-05-23
申请号：PCT/US0114607
申请日：2001-05-07
申请人： CROSSROADS SYS INC , NELSON MICHAEL A
发明人： NELSON MICHAEL A
IPC分类号： H04L12/56 , G06F5/06 , H04L29/06
CPC分类号： H04L49/9042 , H04L49/90
摘要： In one embodiment, the system comprises a receive buffer which is coupled to associated write logic and read logic. A data stream is delivered to the system, wherein the data stream comprises a plurality of frames. Each frame comprises a plurality of words, wherein a first word is identified by a SOF flag and a last word is identified by an EOF flag. The buffer is configured to be accessed in a first-in-first-out fashion. The write logic includes two serial pipeline stages through which received words pass. The word in the first stage is examined to determine whether the corresponding EOF flag is set. If the EOF flag is set, the write logic sets an early-EOF flag in the word which is in the second pipeline stage. As a result, the early-EOF flag is set in the next-to-last word in each frame. When it is desired to read the next frame out of the buffer, the read logic is configured to start reading words out of the buffer. As each word is read out, it is examined by the read logic to determine whether the corresponding early-EOF flag is set. If this flag is not set, the read logic does not anticipate the end of the frame and continues to read successive words out of the buffer. When the read logic reads a word out of the buffer in which the early-EOF flag is set, the read logic anticipates the end of the frame and prepares to stop reading after the next word (which is the last word in the frame.) The system thereby provides sufficient setup time for the read logic to stop reading words out of the buffer before reaching the next frame.
摘要翻译：在一个实施例中，系统包括耦合到相关联的写入逻辑和读取逻辑的接收缓冲器。数据流被传送到系统，其中数据流包括多个帧。每个帧包括多个单词，其中第一个单词由一个SOF标志识别，最后一个单词由一个EOF标志识别。缓冲区被配置为以先入先出的方式访问。写入逻辑包括两个串行流水线阶段，接收的单词通过该阶段。检查第一阶段中的字以确定是否设置相应的EOF标志。如果设置了EOF标志，则写入逻辑在第二个流水线阶段的字中设置一个早期EOF标志。结果，早期EOF标志被设置在每帧中的下一个最后一个字。当希望从缓冲器中读出下一帧时，读取逻辑被配置为开始从缓冲器读出单词。当每个字被读出时，它被读取的逻辑检查以确定相应的早期EOF标志是否被设置。如果该标志未被设置，则读取逻辑不会预期帧的结束并且继续读取缓冲器中的连续字。当读取逻辑从设置早期EOF标志的缓冲器中读出一个字时，读取逻辑预期帧的结束并准备在下一个字（这是帧中的最后一个字）之后停止读取。因此，该系统为读逻辑提供足够的建立时间，以便在到达下一帧之前停止从缓冲器中读出单词。

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