Clock supply apparatus indicating and transmitting preciseness of generated clock signal
AssigneeFujitsu Limited
InventorsToshio Iyota, Takeo Kato
Life of this patent
Estimating the term…
Abstract
A clock supply apparatus contains: a clock generating unit for generating a clock signal; a phase comparing unit for inputting a reference clock signal, and obtaining a phase difference between the reference clock signal and the clock signal generated by the clock generating unit; a frequency control unit for generating a control signal for controlling the frequency of the clock signal generated by the clock generating unit, based on the phase difference; a clock preciseness monitoring unit for monitoring preciseness of the clock signal, based on the phase difference; and a clock preciseness output unit for outputting information indicating the preciseness of the clock signal, based on the phase difference.
Claims7
A clock supply apparatus comprising:
- clock generating means for generating a clock signal having a frequency;
- phase comparing means for inputting a reference clock signal, and for obtaining a phase difference between the reference clock signal and the clock signal generated by the clock generating means;
- frequency control means for generating a control signal for controlling said frequency of the clock signal generated by the clock generating means, based on the phase difference;
- a clock preciseness monitoring means, coupled to said phase comparing means, for monitoring preciseness of the clock signal, based on the phase difference;
- a clock preciseness output means for outputting information indicating the preciseness of the clock signal, based on the phase difference;
- and
- a command receiving means for receiving a command from outside said clock supply apparatus, said command requesting at least one of switching transmission lines, switching said reference clock signal, rewriting a program in a memory, rewriting control data in a memory, transmission of said information indicating preciseness of the clock signal, transmission of alarm information, transmission of log data, transmission of information on the switching of the transmission lines, and transmission of information on the switching of the reference clock signal.
Dependencies are inferred from the claim text.