| 摘要 |
<p>PURPOSE:To realize a necessary control function with simple control circuit constitution by controlling data transfer between a register and equipments which transfer data through the register by a controller which is positioned between the equipments. CONSTITUTION:The register 2 is interposed between the equipments A and B and when data is transferred from the equipment A to the device B, a signal for storing transfer data is ouptutted from the equipment A to the register 2 as a 1st signal and the device B when finishing reading the transfer data out of the register 2 outputs a signal indicating that as a 2nd signal. At this time, the 1st and 2nd signals are branched and inputted to a data transfer controller 1 and a flip-flop 11 is preset with one of the two signal and cleared with the other. Consequently, a means which indicates the state of the register need not be provided in each equipment and any interruption function from an opposite equipment is not required.</p> |
