| 摘要 |
PURPOSE:To prevent the reduction of transfer capacity and the generation of a transfer stop state or the like by restricting the sending of a data packet when the difference between the count values of counting means indicates a value smaller than the contents of a block residual limiting register. CONSTITUTION:The titled system is provided with a counting means 17 for counting the number of data packets accumulated in the storage block of an input/output buffer 12 in a transfer control circuit (TC) 5 in each unit processor (UP) and waiting for being sent in each input/output terminal to be sent and a counting means 16 for counting the number of unused idle storage blocks. In addition, a block number ratio limiting register 18 or a block residual limiting number register 19 to be set up by a CP (processor for executing random processing under control based upon a program) 4 is prepared and always monitored by the CP 4 and an input/output control circuit 11. When the using rate of the input/output buffer 12 is increased, the sending of data packets is restricted. Consequently, excess data sending can be suppressed.
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