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    • 2. 发明公开
    • 비휘발성 메모리 기록 동작에서의 지속적 검증
    • 在非易失性存储器写操作中继续验证
    • KR1020080089459A
    • 2008-10-06
    • KR1020087018467
    • 2006-12-27
    • 샌디스크 엘엘씨
    • 첸지앙
    • G11C16/34G11C16/10
    • G11C16/3468G11C16/3486G11C16/3459G11C16/0483G11C16/10
    • Temporary lock-out is provided while programming a group of non-volatile memory cells to more accurately program the memory cells. After successfully verifying that the threshold voltage of a memory cell has reached the level for its intended state, it is possible that the threshold voltage will subsequently decrease to below the verify level during additional iterations of the programming process needed to complete programming of other memory cells of the group. Memory cells are monitored (e.g., after each iteration) to determine if they fall below the verify level after previously verifying that the target threshold voltage has been reached. Cells that pass verification and then subsequently fail verification can be subjected to further programming. For example, the bit line voltage for the memory cell of interest may be set to a moderately high voltage to slow down or reduce the amount of programming accomplished by each subsequent programming pulse. In this manner, a memory cell that falls out of verification can be placed back in the normal programming flow without risking over-programming of the cell.
    • 在编写一组非易失性存储单元以更准确地对存储单元进行编程时,提供临时锁定。 在成功验证存储器单元的阈值电压已经达到其预期状态的电平之后,有可能阈值电压随后在完成其它存储器单元的编程所需的编程过程的附加迭代期间降低到低于验证电平 的组合。 监视存储器单元(例如,在每次迭代之后),以确定在先前验证是否已达到目标阈值电压之后它们是否落在验证电平以下。 通过验证然后随后验证失败的单元可以进行进一步的编程。 例如,感兴趣的存储单元的位线电压可以被设置为适度的高电压以减慢或减少由每个随后的编程脉冲实现的编程量。 以这种方式,退出验证的存储单元可以放回到正常编程流程中,而不会对单元进行过度编程的风险。