Memory block reallocation in a flash memory device
First Claim
Patent Images
1. A memory device comprising:
- a global wordline driver;
n global wordlines coupled to the global wordline driver; and
m local wordline drivers each coupled to a respective one of m physical memory blocks and having n global wordline inputs, wherein at least one of the n global wordline inputs of at least two of the m local wordline drivers are not coupled to at least one of the n global wordlines.
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Abstract
A non-volatile memory device has the pages of a certain memory block reallocated to other blocks in order to increase decrease disturb and increase reliability. Each of the reallocation blocks that contain the reallocated pages from the desired memory block are coupled to a wordline driver. These wordline drivers have a subset of the global wordlines as inputs. The desired wordline driver is selected by an appropriate select signal from a block decoder and an indication on an appropriate global wordline. This causes the wordline driver to generate a local wordline to the desired block with the reallocated page to be accessed.
19 Citations
20 Claims
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1. A memory device comprising:
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a global wordline driver; n global wordlines coupled to the global wordline driver; and m local wordline drivers each coupled to a respective one of m physical memory blocks and having n global wordline inputs, wherein at least one of the n global wordline inputs of at least two of the m local wordline drivers are not coupled to at least one of the n global wordlines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A memory device comprising:
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a global wordline driver; a plurality of global wordlines coupled to the global wordline driver; a first plurality of local wordline drivers each coupled to a respective one of a first plurality of physical memory blocks; and a second plurality of local wordline drivers each coupled to a respective one of a second plurality of physical memory blocks, wherein each of the first plurality of local wordline drivers are coupled to the plurality of global wordlines and wherein the second plurality of local wordline drivers are coupled to the plurality of global wordlines such that the plurality of global wordlines is divided between the second plurality of local wordline drivers. - View Dependent Claims (13, 14, 15, 16)
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17. A memory device comprising:
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a global wordline driver; a plurality of local wordline drivers coupled to the global wordline driver by a plurality of global wordlines; a plurality of memory blocks, each memory block coupled to a different one of the plurality of local wordline drivers; a plurality of block decoders, each block decoder coupled to a different one of the plurality of local wordline drivers, each block decoder configured to decode a received block address and enable its respective local wordline driver, wherein a first memory block of the plurality of memory blocks is divided between a first and a second local wordline driver. - View Dependent Claims (18, 19, 20)
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Specification