THREE DIMENSIONAL NON-VOLATILE STORAGE WITH DUAL LAYERS OF SELECT DEVICES
First Claim
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1. A non-volatile storage system, comprising:
- a monolithic three dimensional memory array of memory cells;
word lines connected to the memory cells;
a plurality of vertically oriented bit lines connected to the memory cells;
a plurality of global bit lines;
a first plurality of select devices that are connected to the global bit lines;
a second plurality of select devices that are connected to the vertically oriented bit lines and the first plurality of select devices, the first plurality of select devices are on a first level and the second plurality of select devices are on a second level that is above the first level; and
select lines connect to the first plurality of select devices and the second plurality of select devices.
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Abstract
A three-dimensional array adapted for memory elements that reversibly change a level of electrical conductance in response to a voltage difference being applied across them. Memory elements are formed across a plurality of planes positioned different distances above a semiconductor substrate. Bit lines to which the memory elements of all planes are connected are oriented vertically from the substrate and through the plurality of planes.
56 Citations
20 Claims
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1. A non-volatile storage system, comprising:
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a monolithic three dimensional memory array of memory cells; word lines connected to the memory cells; a plurality of vertically oriented bit lines connected to the memory cells; a plurality of global bit lines; a first plurality of select devices that are connected to the global bit lines; a second plurality of select devices that are connected to the vertically oriented bit lines and the first plurality of select devices, the first plurality of select devices are on a first level and the second plurality of select devices are on a second level that is above the first level; and select lines connect to the first plurality of select devices and the second plurality of select devices. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operating a storage system comprising a monolithic three dimensional memory array of memory cells, vertically oriented bit lines and word lines are connected to the memory cells, the method comprising:
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applying a selected word line voltage to a word line connected to a selected memory cell, a selected vertically oriented bit line is also connected to the selected memory cell; applying a selected bit line voltage to selected global bit lines based on a data pattern, the global bit lines communicate with the vertically oriented bit lines via a first plurality of select devices that are connected to the global bit lines and a second plurality of select devices that are connected to the vertically oriented bit lines and the first plurality of select devices, the first plurality of select devices are on a first level and the second plurality of select devices are on a second level that is above the first level; turning on a first select device from the first plurality of select devices and a second select device from the second plurality of select devices by applying a first selection signal to a first select line connected to the first select device and applying a second selection signal to a second select line connected to the second select device, the first select line is on an opposite side of a stack than the second select line in which the stack includes the first select device and the second select device connected together in series; and performing a memory operation in the selected memory cell in response to the selected bit line voltage and the selected word line voltage. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A non-volatile storage system, comprising:
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a substrate layer; select layer positioned above and not in the substrate layer; a memory layer positioned above and not in the substrate layer, the memory layer includes; a monolithic three dimensional array of memory elements, word lines connected to the memory elements, groups of word lines are connected together, and vertically oriented bit lines connected to the memory elements, the memory elements in combination with the vertically oriented bit lines and the word lines form a continuous mesh, the select layer includes select lines, the select layer includes a top row of vertically oriented select devices that are connected to the vertically oriented bit lines and a bottom row of vertically oriented select devices that are connected to the select lines, select devices of the top row of vertically oriented select devices are in series with select devise of the bottom row of vertically oriented select devices. - View Dependent Claims (20)
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Specification