摘要:
A method of programming a nonvolatile memory cell. The nonvolatile memory cell includes a diode steering element in series with a carbon storage element The method includes providing a first voltage to the nonvolatile memory cell. The first voltage reverse biases the diode steering element. The carbon storage element sets to a lower resistivity state.
摘要:
A method for using a multi-use memory cell and memory array are disclosed. In one preferred embodiment, a memory cell is operable as a one-time programmable memory cell or a rewritable memory cell. The memory cell comprises a memory element comprising a semiconductor material configurable to one of at least three resistivity states, wherein a first resistivity state is used to represent a data state of the memory cell when the memory cell operates as a one-time programmable memory cell but not when the memory cell operates as a rewritable memory cell. A memory array with such memory cells is also disclosed. In another preferred embodiment, a memory cell is provided comprising a switchable resistance material, wherein the memory cell is operable in a first mode in which the memory cell is programmed with a forward bias and a second mode in which the memory cell is programmed with a reverse bias.
摘要:
A multi-headed word line driver circuit incorporates bent-gate transistors to reduce the pitch otherwise achievable for interfacing to tightly-pitched array lines. In certain exemplary embodiments, a three-dimensional memory array includes multiple memory blocks and array lines traversing horizontally across at least one memory block. Vertical active area stripes are disposed beneath a first memory block, and a respective plurality of bent-gate electrodes intersects each respective active area stripe to define individual source/drain regions. Every other source/drain region is coupled to a bias node for the active area stripe, and remaining source/drain regions are respectively coupled to a respective array line associated with the first memory block, thereby forming a respective first driver transistor for the respective array line. In certain embodiments, a respective plurality of complementary array line driver circuits is disposed on each side of a connection area between adjacent memory blocks, and each such driver circuit is responsive to a single driver input node.
摘要:
A multi-use memory cell and memory array are disclosed. In one preferred embodiment, a memory cell is operable as a one-time programmable memory cell or a rewritable memory cell. The memory cell comprises a memory element comprising a semiconductor material configurable to one of at least three resistivity states, wherein a first resistivity state is used to represent a data state of the memory cell when the memory cell operates as a one-time programmable memory cell but not when the memory cell operates as a rewritable memory cell. A memory array with such memory cells is also disclosed. In another preferred embodiment, a memory cell is provided comprising a switchable resistance material, wherein the memory cell is operable in a first mode in which the memory cell is programmed with a forward bias and a second mode in which the memory cell is programmed with a reverse bias.
摘要:
A nonvolatile memory cell comprising a diode formed of semiconductor material can store memory states by changing the resistance of the semiconductor material by application of a set pulse (decreasing resistance) or a reset pulse (increasing resistance.) In preferred embodiments, set pulses are applied with the diode under forward bias, while reset pulses are applied with the diode in reverse bias. By switching resistivity of the semiconductor material of the diode, a memory cell can be either one-time programmable or rewriteable, and can achieve two, three, four, or more distinct data states.
摘要:
A method of programming a monolithic three-dimensional (3-D) memory having a plurality of levels of memory cells above a silicon substrate is disclosed. The method includes initializing a program voltage and program time interval; selecting a memory cell to be programmed within the three-dimensional memory having the plurality of levels of memory cells; applying a pulse having the program voltage and the program time interval to the selected memory cell; performing a read after write operation with respect to the selected memory cell to determine a measured threshold voltage value; and comparing the measured threshold voltage value to a minimum program voltage. In response to the comparison between the measured threshold voltage value and the minimum program voltage, the method further includes selectively applying at least one subsequent program pulse to the selected memory cell.
摘要:
A storage system and method for operating the storage system that uses reversible resistance-switching elements is described. Techniques are disclosed herein for varying programming conditions to account for different resistances that memory cells have. These techniques can program memory cells in fewer attempts, which can save time and/or power. Techniques are disclosed herein for achieving a high programming bandwidth while reducing the worst case current and/or power consumption.
摘要:
A storage system and method for operating the storage system that uses reversible resistance-switching elements is described. Techniques are disclosed herein for varying programming conditions to account for different resistances that memory cells have. These techniques can program memory cells in fewer attempts, which can save time and/or power. Techniques are disclosed herein for achieving a high programming bandwidth while reducing the worst case current and/or power consumption.
摘要:
A storage system and method for forming a storage system that uses punch-through diodes as a steering element in series with a reversible resistivity-switching element is described. The punch-through diode allows bipolar operation of a cross-point memory array. The punch-through diode may have a symmetrical non-linear current/voltage relationship. The punch-through diode has a high current at high bias for selected cells and a low leakage current at low bias for unselected cells. Therefore, it is compatible with bipolar switching in cross-point memory arrays having resistive switching elements. The punch-through diode may be a N+/P−/N+ device or a P+/N−/P+ device.
摘要翻译:描述了一种用于形成使用穿通二极管作为与可逆电阻率切换元件串联的转向元件的存储系统的存储系统和方法。 穿通二极管允许交叉点存储器阵列的双极性操作。 穿通二极管可具有对称的非线性电流/电压关系。 穿通二极管在选择的电池的高偏压下具有高电流,对于未选择的电池,在低偏压下具有低泄漏电流。 因此,它与具有电阻式开关元件的交叉点存储器阵列中的双极开关兼容。 穿通二极管可以是N + / P- / N +器件或P + / N- / P +器件。
摘要:
A monolithic, three dimensional NAND string includes a first memory cell located over a second memory cell, a select transistor, a first word line of the first memory cell, a second word line of the second memory cell, a bit line, a source line, and a select gate line of the select transistor. The first and the second word lines are not parallel to the bit line, and the first and the second word lines extend parallel to at least one of the source line and the select gate line.