| 摘要 |
On transferring transfer data between a peripheral controller (11) and an input-output channel unit (12), an overrun predicting circuit (45) of the input-output channel unit predicts the occurrence of an overrun with reference to an amount of transfer data stored or memorized in a buffer memory (39) and produces an overrun prediction signal (46). The overrun prediction signal is delivered to the peripheral controller by a start informing acknowledgement signal line (15) which is used in transferring a start informing acknowledgement signal from the input-output channel unit to the peripheral controller before the transfer data is transferred between the peripheral controller and the input-output channel unit. Responsive to the overrun prediction signal, a strobe inhibiting circuit (21) of the peripheral controller inhibits delivery of a strobe pulse signal from the peripheral controller to the input-output channel unit during a predetermined time interval.
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