Patent ID: 7061940

Claim:
A method for synchronizing a plurality of bus systems, said method comprising: transmitting synchronization signals from a transmission unit to an associated reception unit said associated reception unit supplying synchronization signals to a phase regulator in a phase locked loop having a clock transmitter, where each bus system has at least one transmission unit and at least one associated reception unit; said transmission unit using a central clock to generate said synchronization signals autonomously for cyclic transmission to said associated reception unit, wherein said central clock is prescribed for each of said transmission units in a bus system; upon receipt of said synchronization signals, said phase regulator ascertains instantaneous phase errors and readjusts the clock transmitter such that said clock transmitter outputs a nominal number of clock signals between two synchronization signals, wherein said nominal number of clock signals is prescribed as said central clock for a transmission unit in second another bus system; and transmitting data between said synchronized transmission unit and associated reception unit.