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    • 88. 发明授权
    • Circuit and method for retrieving data stored in semiconductor memory cells
    • 用于检索存储在半导体存储单元中的数据的电路和方法
    • US07889586B2
    • 2011-02-15
    • US12248843
    • 2008-10-09
    • Luca CrippaGiancarlo RagoneMiriam SangalliRino Micheloni
    • Luca CrippaGiancarlo RagoneMiriam SangalliRino Micheloni
    • G11C7/04
    • G11C11/5642G11C7/04G11C16/30
    • A circuit comprises at least one memory cell adapted to store data in terms of values of an electrical characteristic thereof, which exhibits a variability with temperature according to a first variation law; a voltage generator is provided for generating a voltage to be supplied to the at least one memory cell for retrieving the data stored therein, the voltage generator including first means adapted to cause the generated voltage take a value in a set of target values including at least one target value, corresponding to an operation to be performed on the memory cell. The voltage generator comprises second means for causing the value taken by the generated voltage vary with temperature according to a prescribed second variation law exploiting a compensation circuit element having said electrical characteristic.
    • 电路包括至少一个存储单元,适于根据其电特性的值存储数据,其根据第一变化规律表现出与温度的变化性; 提供电压发生器,用于产生要提供给所述至少一个存储单元的电压以检索存储在其中的数据,所述电压发生器包括适于使所产生的电压取值至少包括至少一组目标值的值的第一装置 一个目标值,对应于要在存储器单元上执行的操作。 电压发生器包括第二装置,用于使得所产生的电压所采取的值根据规定的第二变化规律随温度变化,利用具有所述电特性的补偿电路元件。
    • 90. 发明申请
    • NAND FLASH MEMORY DEVICE WITH ECC PROTECTED RESERVED AREA FOR NON-VOLATILE STORAGE OF REDUNDANCY DATA
    • 具有ECC保护区域的NAND闪存存储器件,用于非易失存储冗余数据
    • US20080065937A1
    • 2008-03-13
    • US11854685
    • 2007-09-13
    • Rino MicheloniRoberto RavasioAlessia Marelli
    • Rino MicheloniRoberto RavasioAlessia Marelli
    • G11C29/04
    • G11C29/82G06F11/1068G11C29/24G11C2029/0411
    • Basic redundancy information is non-volatily stored in a reserved area of an addressable area of a memory array, and is copied to volatile storage therein at every power-on of the memory device. The unpredictable though statistically inevitable presence of failed array elements in such a reserved area of the memory array corrupts the basic redundancy information established during the test-on wafer (EWS) phase of the fabrication process. This increases the number of rejects, and lowers the yield of the fabrication process. This problem is addressed by writing the basic redundancy data in the reserved area of the array with an ECC technique using a certain error correction code. The error correction code may be chosen among majority codes 3, 5, 7, 15 and the like, or the Hamming code for 1, 2, 3 or more errors, as a function of the fail probability of a memory cell as determined by the EWS phase during fabrication.
    • 基本冗余信息被非挥发地存储在存储器阵列的可寻址区域的保留区域中,并且在存储器件的每次上电时复制到其中的易失性存储器。 在存储器阵列的这种保留区域中,不可预测的,不可避免的存在故障阵列元件会破坏在制造过程的测试晶片(EWS)阶段期间建立的基本冗余信息。 这增加了废品的数量,降低了制造工艺的产量。 通过使用特定的纠错码通过ECC技术将阵列的保留区域中的基本冗余数据写入该问题来解决该问题。 可以在多数代码3,5,7,15等之中选择纠错码,或者对于1,2,3或更多个错误,可以选择Hamming代码作为存储器单元的故障概率的函数,如由 EWS相制造期间。