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Method and device for the synchronisation between two networks
| Details |
Inventors: Le Scolan, Lionel; Braneci, Mohamed; Nezou, Patrice; Rousseau, Pascal;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Najjar; Saleh
Assistant Examiner: Won; Michael Y.
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto
The present invention relates to a method of synchronisation between communication networks exchanging information by frame of informations, each communication network having clock and the number of clock pulses is monitored by a counter. The synchronisation is made by reading information representing the counted clock pulses of the clock of the first network at the appearance of a reference event, inserting at least said information or calculated information on the basis of said information into the frame of information as the synchronisation information, transferring said frame of information from the first to the second network, reading information representing the number of counted clock pulse of the clock of the second network at the appearance of reference event, reading synchronisation information inserted in received frame of information from the first network, calculating a difference between information and synchronising the second network. |
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DETAILED DESCRIPTION In general terms, this invention solves the problem of synchronisation between the two synchronisation nodes or "cycle masters" of the serial communication buses under consideration.
The present invention thus aims to remedy this problem by proposing a method of synchronisation between communication networks exchanging information by frame of informations, each communication network having clock and the number of clock pulses is monitored by a counter, the method comprises the following steps: reading information representing the counted clock pulses of the clock of the first network at the appearance of a reference event, inserting at least said information or calculated information on the basis of said information into the frame of information as the synchronisation information, transferring said frame of information from the first to the second network, reading information representing the number of counted clock pulse of the clock of the second network at the appearance of reference event, reading synchronisation information inserted in received frame of information from the first network, calculating a difference between information, synchronising the second network.
Correlatively, the invention proposes an apparatus for synchronisation between communication networks exchanging information by frame of informations, each communication network having clock and the number of clock pulses is monitored by a counter, the apparatus connected to at least two networks comprising: reading means for reading information representing the counted clock pulses of the clock of the first network at the appearance of a reference event, inserting means for inserting at least said information or calculated information on the basis of said information into the frame of information as the synchronisation information, transferring means for transferring said frame of information from the first to the second network, reading means for reading information representing the number of counted clock pulse of the clock of the second network at the appearance of reference event, reading means for reading synchronisation information inserted in received frame of information, calculating means for calculating a difference between information, synchronising means for synchronising the second network
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Multiplexer-related 
