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    • 24. 发明授权
    • SOFTWARE REFRESHED MEMORY DEVICE AND METHOD
    • DURCH SOFTWARE AUFGEFRISCHTE SPEICHEREINRICHTUNG UND VERFAHREN
    • EP1540657B1
    • 2011-07-20
    • EP03749204.8
    • 2003-08-28
    • Micron Technology, Inc.
    • GILTON, Terry, L.
    • G11C11/406G11C16/34
    • G11C5/005G11C11/406G11C11/40603G11C11/40622G11C13/0004G11C13/0011G11C13/0033G11C13/0069G11C16/3431
    • A software refreshed memory device comprises a plurality of memory cells that must be periodically refreshed to avoid losing data. Preferably, the memory cells can avoid losing data even though the time interval between successive memory refresh operations is relatively long, as compared to the time interval between successive memory refresh operations in a conventional volatile memory device, such as a DRAM. A processor can perform periodic memory refresh operations by executing a set of memory refresh instructions implemented in software, rather than in hardware. Accordingly, the memory device can advantageously be simplified, because the need for memory refresh circuitry and for a unique refresh control signal are advantageously eliminated. Moreover, the processor executing the memory refresh instructions can typically perform more sophisticated algorithms, as compared to memory refresh circuitry implemented in hardware, for determining when to perform a memory refresh operation. For example, the processor can determine whether each individual memory cell needs to be refreshed, thereby advantageously avoiding performing unnecessary refresh operations on nriemory cells that do not need to be refreshed.
    • 软件刷新存储器件包括必须定期刷新以避免丢失数据的多个存储器单元。 优选地,与常规易失性存储器件(例如DRAM)中的连续存储器刷新操作之间的时间间隔相比,即使连续存储器刷新操作之间的时间间隔相对较长,存储器单元也可避免丢失数据。 处理器可以通过执行以软件实现的一组存储器刷新指令而不是硬件来执行周期性的存储器刷新操作。 因此,有利地可以简化存储器件,因为有利地消除了对存储器刷新电路和唯一刷新控制信号的需要。 此外,与硬件中实现的存储器刷新电路相比,执行存储器刷新指令的处理器通常可以执行更复杂的算法,用于确定何时执行存储器刷新操作。 例如,处理器可以确定每个单独的存储器单元是否需要刷新,从而有利地避免对不需要刷新的存储器单元执行不必要的刷新操作。