Bus type clock supplying system for providing a clock in a communication system with a plurality of clock bus lines
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United States of America Patent
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May 20, 1997
Grant Date -
N/A
app pub date -
Mar 29, 1994
filing date -
Mar 29, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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.
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