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    • 15. 发明申请
    • DYNAMIC ERASE DEPTH FOR IMPROVED ENDURANCE OF NON-VOLATILE MEMORY
    • 用于改善非易失性存储器耐久性的动态擦除深度
    • WO2014137928A2
    • 2014-09-12
    • PCT/US2014019995
    • 2014-03-03
    • SANDISK TECHNOLOGIES INC
    • DUTTA DEEPANSHULAI CHUN-HUNGLEE SHIH-CHUNGOOWADA KENHIGASHITANI MASAAKI
    • G11C16/34
    • G11C16/14G11C11/5628G11C11/5635G11C16/16G11C16/3427G11C16/3445G11C16/349
    • Improving endurance for non-volatile memory by dynamic erase depth is disclosed. A group of memory cells are erased. Then, at least some of the erased memory cells are programmed. Programming the memory cells typically impacts the erase threshold distribution of those memory cells that were intended to stay erased. The erase depth of the next erase can be adjusted based on how the program operation affects the erase threshold distribution. As one example, the upper tail of the erase distribution is measured after programming. The higher the upper tail, the shallower the next erase, in one embodiment. This helps to improve endurance. In one embodiment, the erase depth is adjusted by determining a suitable erase verify level. Rather than (or in addition to) adjusting the erase verify level, the number of erase pulses that are performed after erase verify passes can be adjusted to adjust the erase depth.
    • 公开了通过动态擦除深度改进非易失性存储器的耐久性。 一组存储器单元被擦除。 然后,至少一些擦除的存储单元被编程。 对存储器单元进行编程通常会影响想要保持擦除的那些存储器单元的擦除阈值分布。 可以根据编程操作如何影响擦除阈值分布来调整下一次擦除的擦除深度。 作为一个例子,擦除分布的上部尾部在编程之后被测量。 在一个实施例中,上尾越高,下次擦除越浅。 这有助于提高耐力。 在一个实施例中,通过确定合适的擦除验证电平来调整擦除深度。 除了调整擦除验证电平(或除此之外),擦除验证通过之后执行的擦除脉冲的数量可被调整以调整擦除深度。
    • 16. 发明申请
    • BITLINE VOLTAGE REGULATION IN NON-VOLATILE MEMORY
    • 非易失性存储器中的电压调节
    • WO2014022281A1
    • 2014-02-06
    • PCT/US2013/052504
    • 2013-07-29
    • SPANSION LLC
    • BINBOGA, Evrim
    • G11C16/24G11C16/30G11C16/34
    • G11C16/10G11C16/24G11C16/3427
    • Systems and methods are provided to minimize write disturb conditions in an untargeted memory cell of a non-volatile memory array. Bitline driver circuits are provided to control a ramped voltage applied both to a bitline of a target memory cell and a neighboring bitline of an untargeted memory cell, Various embodiments advantageously maintain the integrity of data stored in the untargeted memory cells by applying a controlled voltage signal to a previously floating bitline of a neighbor cell to reduce a potential difference between the source and drain nodes of the untargeted. neighbor memory cell during a write operation at a target memory cell. In another embodiment, an increased source bias voltage is applied on a "source" bitline of the target cell during the ramping of the drain bias voltage and then reduced to a ground or near ground potential during the write operation.
    • 提供了系统和方法以最小化非易失性存储器阵列的非目标存储器单元中的写入干扰状况。 提供位线驱动器电路以控制施加到目标存储器单元的位线和非目标存储器单元的相邻位线的斜坡电压。各种实施例有利地通过施加受控电压信号来维持存储在非目标存储器单元中的数据的完整性 到相邻小区的先前浮动的位线,以减少非目标的源和漏节点之间的电位差。 在目标存储器单元的写操作期间的相邻存储单元。 在另一个实施例中,在漏极偏置电压的斜坡期间,增加的源极偏置电压被施加在目标单元的“源”位线上,然后在写入操作期间被减小到接地或接地电位。
    • 17. 发明申请
    • FLASH MEMORY WITH TARGETED READ SCRUB ALGORITHM
    • 具有指定读取SCRUB算法的闪存
    • WO2013191870A1
    • 2013-12-27
    • PCT/US2013/043692
    • 2013-05-31
    • SANDISK TECHNOLOGIES INC.
    • SPROUSE, Steven, T.BAUCHE, AlexandraHUANG, YichaoCHEN, JianHUANG, JianminLEE, Dana
    • G11C16/34
    • G11C16/3418G11B20/18G11B20/1883G11C16/3427G11C16/3431
    • A method and system have been described for counteracting and correcting for read disturb effects in blocks of flash memory. The method may include the step of a controller of the memory system performing a read scrub scan on only a portion of one targeted word line in a block at desired intervals. The controller may calculate whether a read scrub scan is necessary based on a probabilistic determination that is calculated in response to each received host read command. The controller may then place a block associated with the targeted word line into a refresh queue if a number of errors are detected in the targeted word line that meets or exceeds a predetermined threshold. The block refresh process may include copying the data from the block into a new block during a background operation.
    • 已经描述了用于抵消和校正闪速存储器块中的读取干扰效应的方法和系统。 该方法可以包括存储器系统的控制器的步骤,其以期望的间隔仅在块中的一个目标字线的一部分上执行读取擦除扫描。 控制器可以基于响应于每个接收的主机读取命令而计算的概率确定来计算是否需要读取擦除扫描。 然后,如果在满足或超过预定阈值的目标字线中检测到多个错误,则控制器然后可以将与目标字线相关联的块放置到刷新队列中。 块刷新过程可以包括在后台操作期间将数据从块复制到新块中。
    • 18. 发明申请
    • READ COMPENSATION FOR PARTIALLY PROGRAMMED BLOCKS OF NON-VOLATILE STORAGE
    • 阅读对非易失性存储部分编程块的补偿
    • WO2013028721A1
    • 2013-02-28
    • PCT/US2012/051797
    • 2012-08-22
    • SANDISK TECHNOLOGIES, INC.LEE, DanaOOWADA, Ken
    • LEE, DanaOOWADA, Ken
    • G11C11/56G11C16/34
    • G11C16/3427G11C11/5642
    • Read compensation for partially programmed blocks of non-volatile storage is provided. In partially programmed blocks, the threshold voltage distributions may be shifted down relative to their final positions. Upon receiving a request to read a page that is stored in a block, a determination may be made whether the block is partially programmed. If so, then a suitable compensation may be made when reading the requested page. This compensation may compensate for the non-volatile storage elements (or pages) in the block that have not yet been programmed. The amount of compensation may be based on the amount of interference that would be caused to the requested page by later programming of the other pages. The compensation may compensate for shifts in threshold voltage distributions of the requested page that would occur from later programming of other pages.
    • 提供了部分编程的非易失性存储块的读取补偿。 在部分编程的块中,阈值电压分布可以相对于其最终位置向下移动。 在接收到读取存储在块中的页面的请求时,可以确定块是否被部分编程。 如果是这样,那么在阅读请求的页面时可以做出适当的补偿。 该补偿可以补偿块中尚未编程的非易失性存储元件(或页)。 赔偿金额可以基于通过稍后对其他页面进行编程而对所请求的页面造成的干扰量。 该补偿可以补偿所请求页面的阈值电压分布的变化,该偏移将从其他页面的后续编程发生。