| 摘要 |
PURPOSE:To suppress a drop of the transfer efficiency by transferring a data from the head of the data to a transfer section data positioned in the end of a block boundary, and inhibiting the storage to a buffer memory of the data which is read out previously, when the subsequent data transfer is aborted. CONSTITUTION:An operation control unit 3 sends out a block boundary block read request for instructing an abortion of a data transfer in a block boundary, to a memory control unit 2. Its contents are transmitted to a request processing circuit 21, and the circuit 21 reads out a necessary data by referring to a buffer memory 20 by a received memory address, and continuously, a block data is read out successively. In this case, the circuit 21 reads out extending from the head of the necessary data to a transfer section data in the end of a block boundary, in accordance with an instruction of a received request designating part, inhibits read-out of the subsequent transfer section data, and also, inhibits a fact that a block data containing this unnecessary data is written onto the buffer memory.
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