JPS56159727A - Data transfer system - Google Patents

Abstract

PURPOSE:To facilitate the design and manufacture of a transfer controlling circuit by simplifying the circuit by transferring processing data from a data carrying circuit, by transmitting and receiving a transfer controlling signal between a data judging and controlling circuit and a device at a data transfer destination. CONSTITUTION:A register 1i in a data carrying circuit 1 receives a clock signal C1 from a data processor and a data unit A transferred at the reception time is held. A register I0 in the circuit 1 holds data to be outputted to another processor and an output branched from the register 1i is received by the decoder circuit 5 of a data judging and controlling circuit 2 to judge whether it is printing data or control data, thereby applying the result to a register 6. Witch clock signals C2 and C3, the data of register 6 is inputted to a data selecting circuit 8 and comparing circuit 10. Then, the 1st control signal generating circuit 12 and the 2nd control signal generating circuit 11 perform the transmission and reception of a transfer control signal to and from the processor at a transfer destination through a control signal transmitting-receiving line 4, transferring processing data from the register I0.