| 摘要 |
When each access apparatus is to update its own data written in a common memory device, the transmitting unit of each access apparatus transmits the previous data previously written in the memory device and new data to be newly written in the memory device as a pair of data via a bus. Upon receiving the pair of data from the access apparatus, a determination unit in the common memory device determines whether the data stored in a memory coincides with the previous data received from the access apparatus. If these two data coincide with each other, the data in the memory is rewritten into the new data; otherwise, a data update in the memory is rejected.
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