CLOCK SUPPLY SYSTEM, CLOCK SUPPLY DEVICE, AND CLOCK SUPPLY METHOD

摘要

PROBLEM TO BE SOLVED: To suppress a phase jump in a clock supply system when performing switching from an act system to a standby system.SOLUTION: Distribution circuits 211 output a 0 system clock and 1 system clock received from an upper rank supply device to respective selectors 212. A synchronization circuit 213 performs phase synchronization between a clock output from each selector 212 and a clock output from a SW 215. An extraction circuit 214A0 and extraction circuit 214A1 extract reference clocks from the 0 system clock and 1 system clock, respectively. A control system makes respective SW 215 perform switching between a reference clock extracted by the extraction circuit 214A0 and a reference clock extracted by the extraction circuit 214A1 of 1 system and switching between a reference clock extracted by the extraction circuit 214A1 and a reference clock extracted by the extraction circuit 214A0 to select a reference clock of 0 system or 1 system for synchronization with a reference clock extracted from each clock.SELECTED DRAWING: Figure 4