| 摘要 |
PURPOSE:To execute a linkage at a high speed by outputting the control signal of the time when inputting a data to a co-processor from a main processor, in a bus cycle for reading out an operation operand onto a data bus from a storage device. CONSTITUTION:When a main processor 1 starts a co-processor 2, in case when an operand data of its operation is in a storage device 3, in a bus cycle for reading out the operand data onto a data bus 6 from the storage device 3 by addressing of the main processor 1, a control signal DT to the co-processor from the main processor is made active, and the operand data on its data bus 6 is inputted directly to the co-processor 2. Also, even when storing an operation result operand into the storage device 3, it is written directly in the storage device 3 from the co-processor 2 by the control signal DT.
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