| 摘要 |
PURPOSE:To execute simultaneously a read-out operation and a write operation in the same machine cycle by constituting so that an address of read-out access and an address of write access can be selected at every way. CONSTITUTION:A selector (SEL) 28 for constituting a selecting circuit of a buffer storage device HSB2 is controlled by an output signal of a way number register (WNR) 25. That is to say, a write operation to the HSB2 is controlled so that only one way of a data part 22 of the HSB2 designated by the way number register (WNR) 25 is accessed by bits 20-25 of an operand address port (OPAP) 4, and a read-out operation processed at the same time is controlled so that a tag part 21 of a the HSB2 and the data part 22 except the way designated by the way number register (WNR) 25 are accessed by the bits 20-25 of an effective address register (EAR) 1. In this way, the read-out operation to other way except said write way, and this write operation are executed in the same machine cycle.
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