Timing control method in a common bus system having delay and phase correcting circuits for transferring data in synchronization and time division slot among a plurality of transferring units

Claim 1

A timing control method in a common bus system in which n units having unit numbers 1 to n are connected through a common-time-division bus, said units being connected in series and in the order of the unit numbers, said common-time-division controlled bus comprising transmission and reception buses providing access to each of said units, said transmission and reception buses being connected together at said unit number 1, and a plurality of phase correcting means corresponding to said units, each of said phase correcting means performing a phase correction of data based on base clock signals generated in the unit number 1 when data are transmitted/received from one of said units to an adjacent unit, said method comprising the steps of: setting a transmission delay information with a specific delay difference which is determined in accordance with the unit number of each of said units, said transmission delay being based on a synchronization frame head signal generated in the unit number 1; and preparing a timing signal which determines a transmission time slot for the data transmission on the common-time-division controlled bus based on the received transmission delay information, said transmission time slot having a timing difference relative to the adjacent unit and being set between reception time slots; said unit number 1 transmitting said first and second fundamental signals which are based on the synchronization frame head signal to said unit with the unit number 2; each of said units having the units number 2 to n sequentially receiving first and second fundamental signals having a fixed delay difference which are prepared in the last unit to transmit delayed first and second fundamental signals being made respectively by adding additional fixed delay differences to the received first and second fundamental signals.