公开(公告)号：US5631931A

公开(公告)日：1997-05-20

申请号：US219525

申请日：1994-03-29

申请人： Masataka Takano ,  Toshihide Fujio

发明人： Masataka Takano ,  Toshihide Fujio

IPC分类号： G06F1/12 ,  G06F1/04 ,  H03L7/14 ,  H04J3/06 ,  H04L7/00 ,  H04L7/04 ,  H04B7/12

CPC分类号： H04J3/0688 ,  H03L7/143 ,  H04L7/0008

摘要： A bus type clock supplying system in a communication system with master-slave synchronization includes communication cards connected with transmission lines within a communication system and a clock bus. Each communication card includes a clock supplying section including a frequency divider for extracting a clock from the transmission lines and a tri-state device outputting the clock to the clock bus; a clock receiving section including a clock selector for selecting one clock from a plurality of the bus-type clock lines, and a frequency multiplier for multiplying the frequency of the selected clock; and a monitoring and controlling section having a function of monitoring interruption of clock input, abnormalities in the frequency multiplier, etc., and a function of controlling the tri-state device and the clock selector.

摘要翻译： 在具有主从同步的通信系统中的总线类型时钟供给系统包括与通信系统内的传输线连接的通信卡和时钟总线。 每个通信卡包括时钟提供部分，其包括用于从传输线提取时钟的分频器和将时钟输出到时钟总线的三态装置; 时钟接收部分，包括用于从多个总线类型时钟线选择一个时钟的时钟选择器，以及用于将所选时钟的频率相乘的倍频器; 以及具有监视时钟输入中断，倍频器异常等功能的监视和控制部分，以及控制三态装置和时钟选择器的功能。