| 摘要 |
PURPOSE:To increase effective processing speed, by fetching an instruction data from a first memory device directly to an execution device through a bypassing circuit when an instruction prefetching device is vacant, and registering the instruction data passing through the bypassing circuit in a second memory device. CONSTITUTION:In a data processor provided with the prefetching function of data, an instruction queue 1 as the instruction prefetching device, an instruction decoding part 2, an instruction executing part 3 as the execution device, an instruction cache 4 as a second memory device, and the bypassing circuit 5 as the bypassing circuit, are provided. And when the instruction prefetching device 1 becomes vacant, the instruction data is fetched from a main memory directly to the instruction decoding part 2 through the bypassing circuit 5, and the instruction data passed through the bypassing circuit 5 is stored in the second memory device 4. In such way, it is possible to increase the effective processing speed.
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