| 摘要 |
PURPOSE:To prevent the competition of read-out data of own or other memory devices by installing a communication means receiving and reporting an access request and a means holding information concerned between memory controllers acting in parallel. CONSTITUTION:The memory controllers 1-0 and 1-1 provided in parallel read data out of the memory devices 2-0, 2-1 or those 2-2 and 2-3 according to the access request from respective access originating devices 3-0, 3-1 and 4-0 those 3-2, 3-3 and 4-1. When the access request with respect to the memory device under other memory controllers' control from each access originating device is received, it is transmitted through the communications means 12-0 and 12-1 and held by timing control register stages 10-0 and 10-1, whereby data read out of its own memory device will not collide with the data read out of other memory devices.
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