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    • 4. 发明申请
    • MEMORY SYSTEM AND METHOD OF OPERATING MEMORY SYSTEM USING SOFT READ VOLTAGES
    • 使用软读取电压操作存储器系统的存储器系统和方法
    • US20140153338A1
    • 2014-06-05
    • US14050430
    • 2013-10-10
    • Dae-seok ByeonBo-geun KimJae-woo Park
    • Dae-seok ByeonBo-geun KimJae-woo Park
    • G11C16/28
    • G11C16/0483G11C16/26G11C16/28G11C16/3404G11C16/3422
    • A method is provided for operating a memory system. The method includes reading nonvolatile memory cells using a first soft read voltage, a voltage level difference between the first soft read voltage and a first hard read voltage being indicated by a first voltage value; and reading the nonvolatile memory cells using a second soft read voltage paired with the first soft read voltage, a voltage level difference between the second soft read voltage and the first hard read voltage being indicated by a second voltage value. The second voltage value is different than the first voltage value. Also, a difference between the first voltage value and the second voltage value corresponds to the degree of asymmetry of adjacent threshold voltage distributions among multiple threshold voltage distributions set for the nonvolatile memory cells of the memory system.
    • 提供了一种用于操作存储器系统的方法。 该方法包括使用第一软读取电压读取非易失性存储器单元,由第一电压值表示第一软读取电压和第一硬读取电压之间的电压电平差; 以及使用与第一软读取电压成对的第二软读取电压读取非易失性存储单元,第二软读取电压和第一硬读取电压之间的电压电平差由第二电压值指示。 第二电压值不同于第一电压值。 此外,第一电压值和第二电压值之间的差异对应于针对存储器系统的非易失性存储器单元设置的多个阈值电压分布中的相邻阈值电压分布的不对称程度。