| 摘要 |
<p>The present invention operates within a data processing system which utilizes dynamic memory requiring periodic refreshment. The data processing system includes a processor coupled to a memory controller which is in turn coupled to the dynamic memory. The memory controller includes a memory operation command queue for sequentially receiving memory operation commands from the processor and a refresh module for initiating refresh operations. The refresh module includes circuitry for initiating either a mandatory refresh operation or an optional refresh operation. Mandatory refresh operations are initiated at the conclusion of periodic intervals, unless an optional refresh operation has been initiated within the particular interval. An optional refresh operation is initiated within a particular interval if the memory operation command queue is empty. Optional refresh operations thereby serve to substitute for mandatory refresh operations, minimizing the system time lost to refresh operations. <IMAGE></p> |
