SYNCHRONIZATION ESTABLISHMENT SYSTEM AND SYNCHRONIZATION ESTABLISHMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide a synchronization establishment system capable of minimizing data error, without increasing the control load or circuit scale, even if the system of a main device circuit is switched at a desired timing, in a synchronization establishment system where the main device circuit is duplicated.SOLUTION: In a synchronization establishment system 10, control circuits 20, 30 include clock generation means 21, 31, frame head generation means 22, 32 for generating frame heads, and adjustment signal generation means 23, 33 for generating adjustment signals, at predetermined intervals, by using a reference clock, and outputting the adjustment signals while inserting to predetermined positions of the frame head, respectively. A plurality of interface circuits 40 synchronize with the control circuits connected therewith, by using a bit counter that is counted up every time when a reference clock is inputted and cleared when the adjustment signal is inputted, and a ch counter that is counted up every time when the adjustment signal is inputted and cleared when the frame head is inputted.SELECTED DRAWING: Figure 1