Detecting and managing bad columns
First Claim
1. A method for managing bad columns of a NAND flash memory array of a NAND flash memory unit, the method comprises:
- receiving or generating bad columns information indicative of the bad columns of the NAND flash memory array on a column to column basis;
receiving an input data unit to be written to the NAND flash memory array;
wherein the input data unit comprises bad column mapped data bits that are mapped to flash memory cells that belong to the bad columns of the NAND flash memory array;
sending the input data unit to the NAND flash memory unit and instructing the NAND flash memory unit to write the input data unit to a first portion of the NAND flash memory array to provide a programmed data unit;
sending the bad column mapped data bits to the NAND flash memory unit; and
instructing the NAND flash memory unit to write the bad column mapped data bits to a second portion of the NAND flash memory array to provide programmed bad column mapped data bits; and
wherein the first and second portions of the NAND flash memory array belong to a same physical page of the NAND flash memory array.
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Accused Products
Abstract
A system, computer readable medium and a method. The system includes a memory controller that comprises a control circuit and an interface. The memory controller is arranged to receive or generate bad columns information indicative of bad columns of the NAND flash memory array; wherein the bad columns information has a column resolution. The memory controller is arranged to receive an input data unit to be written to the NAND flash memory array; wherein the input data unit comprises bad column mapped data bits that are mapped to flash memory cells that belong to bad columns of the NAND flash memory array. The interface is arranged to send the input data unit to the NAND flash memory unit; instruct the NAND flash memory unit to write the input data unit to a first portion of the NAND flash memory array to provide a programmed data unit; send the bad column mapped data bits to the NAND flash memory unit; and instruct the NAND flash memory unit to write the bad column mapped data bits to a second portion of the NAND flash memory array to provide programmed bad column mapped data bits.
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Citations
19 Claims
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1. A method for managing bad columns of a NAND flash memory array of a NAND flash memory unit, the method comprises:
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receiving or generating bad columns information indicative of the bad columns of the NAND flash memory array on a column to column basis; receiving an input data unit to be written to the NAND flash memory array;
wherein the input data unit comprises bad column mapped data bits that are mapped to flash memory cells that belong to the bad columns of the NAND flash memory array;sending the input data unit to the NAND flash memory unit and instructing the NAND flash memory unit to write the input data unit to a first portion of the NAND flash memory array to provide a programmed data unit; sending the bad column mapped data bits to the NAND flash memory unit; and instructing the NAND flash memory unit to write the bad column mapped data bits to a second portion of the NAND flash memory array to provide programmed bad column mapped data bits; and wherein the first and second portions of the NAND flash memory array belong to a same physical page of the NAND flash memory array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A non-transitory computer readable medium that stores instructions to be executed by a computer and cause the computer to perform stages comprising:
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receiving or generating bad columns information indicative of bad columns of a NAND flash memory array of a NAND flash memory unit on a column to column basis; receiving an input data unit to be written to the NAND flash memory array;
wherein the input data unit comprises bad column mapped data bits that are mapped to flash memory cells that belong to the bad columns of the NAND flash memory array;sending the input data unit to the NAND flash memory unit and instructing the NAND flash memory unit to write the input data unit to a first portion of the NAND flash memory array to provide a programmed data unit; sending the bad column mapped data bits to the NAND flash memory unit; instructing the NAND flash memory unit to write the bad column mapped data bits to a second portion of the NAND flash memory array to provide programmed bad column mapped data bits; and wherein the first and second portions of the NAND flash memory array belong to a same physical page of the NAND flash memory array.
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11. A system, comprising a memory controller that comprises a
control circuit and an interface; -
wherein the control circuit is arranged to receive or generate bad columns information indicative of bad columns of the NAND flash memory array on a column to columns basis; wherein the memory controller is arranged to receive an input data unit to be written to the NAND flash memory array;
wherein the input data unit comprises bad column mapped data bits that are mapped to flash memory cells that belong to the bad columns of the NAND flash memory array;wherein the interface is arranged to; send the input data unit to the NAND flash memory unit; instruct the NAND flash memory unit to write the input data unit to a first portion of the NAND flash memory array to provide a programmed data unit; send the bad column mapped data bits to the NAND flash memory unit; instruct the NAND flash memory unit to write the bad column mapped data bits to a second portion of the NAND flash memory array to provide programmed bad column mapped data bits; and wherein the first and second portions of the NAND flash memory array belong to a same physical page of the NAND flash memory array. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification