Apparatus having indications of memory cell density and methods of their determination and use
First Claim
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1. An apparatus, comprising:
- an array of memory cells comprising a plurality of series-connected strings of memory cells; and
a control logic to control access to the array of memory cells;
wherein indications of memory cell density for a plurality of portions of the array of memory cells are stored in the apparatus;
wherein two or more indications of memory cell density correspond to a particular series-connected string of memory cells of the plurality of series-connected strings of memory cells; and
wherein each indication of memory cell density corresponding to the particular series-connected string of memory cells corresponds to a different respective set of memory cells of the particular series-connected string of memory cells.
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Abstract
Methods and apparatus utilizing indications of memory cell density facilitate management of memory density of a memory device. By permitting each of a plurality of portions of a memory array of the memory device to be assigned a corresponding memory cell density determined through an evaluation of those portions of the memory array, better performing portions of the memory array may not be hindered by lesser performing portions of the memory array.
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Citations
45 Claims
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1. An apparatus, comprising:
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an array of memory cells comprising a plurality of series-connected strings of memory cells; and a control logic to control access to the array of memory cells; wherein indications of memory cell density for a plurality of portions of the array of memory cells are stored in the apparatus; wherein two or more indications of memory cell density correspond to a particular series-connected string of memory cells of the plurality of series-connected strings of memory cells; and wherein each indication of memory cell density corresponding to the particular series-connected string of memory cells corresponds to a different respective set of memory cells of the particular series-connected string of memory cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus, comprising:
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an array of memory cells comprising a plurality of series-connected strings of memory cells; and a control logic to control access to a particular memory cell of a particular series-connected string of memory cells of the plurality of series-connected strings of memory cells using a first indication of memory cell density corresponding to the particular memory cell and to control access to a different memory cell of the particular series-connected string of memory cells using a second indication of memory cell density corresponding to the different memory cell; wherein the first indication of memory cell density is independent of the second indication of memory cell density. - View Dependent Claims (13, 14, 15, 16)
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17. An apparatus, comprising:
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a memory device comprising an array of memory cells and storing indications of memory cell density for a plurality of portions of the array of memory cells; and a processor to control access to the memory device, wherein the processor is configured to obtain the indications of memory cell density from the memory device; wherein the array of memory cells comprises a plurality of series-connected strings of memory cells; and wherein two or more indications of memory cell density correspond to a particular series-connected string of memory cells of the plurality of series-connected strings of memory cells; and wherein each indication of memory cell density corresponding to the particular series-connected string of memory cells corresponds to a different respective set of memory cells of the particular series-connected string of memory cells. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of operating a memory device, comprising:
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evaluating disturb mechanisms for a plurality of portions of an array of memory cells of the memory device; determining a corresponding memory cell density for each of the plurality of portions of the array of memory cells in response to evaluating the disturb mechanisms; and storing indications of the determined memory cell densities for each of the plurality of portions of the array of memory cells to the memory device. - View Dependent Claims (29, 30, 31, 32)
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33. A method of operating an array of memory cells, comprising:
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writing data to a plurality of portions of an array of memory cells; reading the data from the plurality of portions of the array of memory cells; comparing the data read from the plurality of portions of the array of memory cells to the data written to the plurality of portions of the array of memory cells; determining a corresponding memory cell density for a particular set of reliability criteria for each of the plurality of portions of the array of memory cells in response to comparing the data; and determining a corresponding memory cell density for the particular set of reliability criteria for each of one or more other portions of the array of memory cells without comparing data read from the one or more other portions of the array of memory cells to data written to the one or more other portions of the array of memory cells. - View Dependent Claims (34, 35, 36, 37)
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38. An apparatus, comprising:
an array of memory cells, wherein; a first group of memory cells of the array of memory cells are assigned a first memory cell density; and a second group of memory cells of the array of memory cells are assigned a second memory cell density different from the first memory density, wherein a memory cell of the first group of memory cells is connected in series with a memory cell of the second group of memory cells. - View Dependent Claims (39, 40, 41)
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42. A method of operating an array of memory cells, comprising:
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individually determining memory cell density for each of a plurality of portions of the array of memory cells; and assigning the corresponding individually determined memory cell density to each of the plurality of portions of the array of memory cells; wherein a memory cell of a particular portion of the plurality of portions of the array of memory cells is connected in series with a memory cell of a different portion of the plurality of portions of the array of memory cells.
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43. A method of operating an array of memory cells, comprising:
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storing a corresponding indication of memory cell density for each of a plurality of portions of the array of memory cells; and operating each of the plurality of portions of the array of memory cells in accordance with its corresponding indication of memory cell density; wherein a memory cell of one of the plurality of portions of the array of memory cells having a particular corresponding indication of memory cell density is connected in series with a memory cell of another one of the plurality of portions of the array of memory cells having a different corresponding indication of memory cell density. - View Dependent Claims (44, 45)
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Specification