The subject innovation is so as to select the most favorable clock of, more particularly, four clock of the circuit for selecting a clock from a number of clocks generated to match the synchronization of all the circuit operations around the electronic exchange, the whole system operation so as to optimize It relates to a clock four neutralizing device.; Object of the present invention is to provide a device for this to occur so to select the most favorable clock from the system by operation in a most preferred stable clock selection by creating four different clock.; In this way, more variety became more preferred clock supplied by the clock generator is enabled it is possible to provide the system stability and reliability.
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