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    CONSTANT PHASE CROSSBAR SWITCH
    6.
    发明公开
    CONSTANT PHASE CROSSBAR SWITCH 审中-公开
    常闭相序开关

    公开(公告)号：EP1016233A1

    公开(公告)日：2000-07-05

    申请号：EP98947153.7

    申请日：1998-09-18

    申请人： Fujitsu Network Communications, Inc. ,  FUJITSU LIMITED

    发明人： CALDARA, Stephen, A. ,  SLUYSKI, Michael, A.

    IPC分类号： H04J3/06

    CPC分类号： H04L49/1576 ,  H04J3/0608 ,  H04J3/0685 ,  H04L7/0337 ,  H04L7/046 ,  H04Q3/54583 ,  H04Q2213/1302 ,  H04Q2213/1304 ,  H04Q2213/13056 ,  H04Q2213/13214 ,  H04Q2213/1332 ,  H04Q2213/13322 ,  H04Q2213/1336

    摘要： A constant phase crossbar switch system (50) which avoids phase discontinuities at the outputs of the crossbar switch. The crossbar switch system includes input logic (56a---56n), a crossbar switch (58), output logic (60a---60n) and a phase locked loop (68). The phase locked loop is used to generate a high speed internal clock from a system clock. High speed serial data streams transmitted at the internal clock frequency are received from corresponding transmitters and are coupled to the input logic. The input logic generates multiple versions of each serial data stream, one of the versions being undelayed and the other versions delayed by some fraction of a bit time. State machines are employed to select the version of the serial data stream which results in the data stream data window being generally centered with respect to the high speed internal clock. The selected version of the data stream is employed as the active input to the crossbar switch. The selected version of the data stream is clocked into an output register which is clocked by the internal clock. The selection of the phase delayed version of the serial data stream in the described manner avoids phase discontinuities upon switching of sourcing transmitters.

    摘要翻译： 一种恒定相横杆开关系统（50），其避免交叉开关输出处的相位不连续性。 交叉开关系统包括输入逻辑（56a-56n），纵横制开关（58），输出逻辑（60a-60n）和锁相环（68）。 锁相环用于从系统时钟产生高速内部时钟。 以内部时钟频率发送的高速串行数据流从相应的发送器接收并耦合到输入逻辑。 输入逻辑为每个串行数据流生成多个版本，其中一个版本未延迟，其他版本延迟一段时间。 采用状态机来选择串行数据流的版本，这导致数据流数据窗口通常相对于高速内部时钟居中。 所选版本的数据流被用作交叉开关的有效输入。 所选版本的数据流被输入到由内部时钟计时的输出寄存器中。 以所描述的方式选择串行数据流的相位延迟版本避免了切换源发射器时的相位不连续性。