| 摘要 |
PROBLEM TO BE SOLVED: To enhance efficiency and cost effectiveness by indicating storage or refusal of data in a main memory and transferring the data between a slave device and a processor interface bus. SOLUTION: When requested data is changed by a local bus slave device, transaction is requested by asserting a first signal by the local bus slave device. In addition, a second signal is also asserted and write of changed data value in the main memory 36 is forced by the local bus slave device. And in this case, the data to be transferred by using the processor interface bus 34 is indicated whether it is stored in the main memory 36 or not by a main memory controller to be communicated with the processor interface bus 34. next, the data are transferred between the slave device 20 and the processor interface bus 34.
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