NONVOLATILE MEMORY DEVICE AND METHOD OF ERASING THE SAME
First Claim
1. A method of erasing a nonvolatile memory device, the method comprising the steps of:
- supplying an erase voltage to a P well of a semiconductor substrate having a memory cell block disposed therein;
performing a first erase verification operation for verifying an erase state of memory cells coupled to even bit lines of the memory cell block;
making a determination of success or failure for the first erase verification operation; and
if, as a result of the determination for the first erase verification operation, all the memory cells coupled to the even bit lines are determined to be erased, performing a second erase verification operation for verifying an erase state of memory cells coupled to odd bit lines of the memory cell block.
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Accused Products
Abstract
A method of erasing a nonvolatile memory device includes the steps of supplying an erase voltage to the P well of a semiconductor substrate having a memory cell block disposed therein; performing a first erase verification operation for verifying the erase state of memory cells coupled to the even bit lines of the memory cell block; making a determination of success or failure for the first erase verification operation; and if, as a result of the determination for the first erase verification operation, all the memory cells coupled to the even bit lines are determined to be erased, performing a second erase verification operation for verifying the erase state of memory cells coupled to odd bit lines of the memory cell block.
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Citations
14 Claims
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1. A method of erasing a nonvolatile memory device, the method comprising the steps of:
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supplying an erase voltage to a P well of a semiconductor substrate having a memory cell block disposed therein; performing a first erase verification operation for verifying an erase state of memory cells coupled to even bit lines of the memory cell block; making a determination of success or failure for the first erase verification operation; and if, as a result of the determination for the first erase verification operation, all the memory cells coupled to the even bit lines are determined to be erased, performing a second erase verification operation for verifying an erase state of memory cells coupled to odd bit lines of the memory cell block. - View Dependent Claims (2, 3)
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4. A method of erasing a nonvolatile memory device, the method comprising the steps of:
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supplying an erase voltage to a P well of a semiconductor substrate having a memory cell block disposed therein; performing an even verification operation for verifying an erase state of memory cells coupled to even bit lines of the memory cell block; if a result of the even verification operation is determined to be failure, raising the erase voltage by a step voltage and performing the steps from the step of supplying the erase voltage to the P well by using the raised erase voltage; if the result of the even verification operation is determined to be success, performing an odd verification operation for verifying an erase state of memory cells coupled to odd bit lines of the memory cell block; if a result of the odd verification operation is determined to be failure, raising the erase voltage by the step voltage, supplying the raised erase voltage to the P well, and performing the odd verification operation again; and if the result of the odd verification operation is determined to be success, finishing an erase operation. - View Dependent Claims (5, 6)
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7. A method of erasing a nonvolatile memory device, the method comprising the steps of:
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supplying an erase voltage to a P well of a semiconductor substrate having a memory cell block disposed therein; performing a first erase verification operation for verifying an erase state of memory cells coupled to even bit lines of the memory cell block; making a determination of success or failure for the first erase verification operation; if, as a result of the determination, the first erase verification operation is determined to be the failure, raising the erase voltage by a step voltage and supplying the raised erase voltage to the P well; performing a second erase verification operation for verifying an erase state of memory cells coupled to odd bit lines of the memory cell block; making a determination of success or failure for the second erase verification operation; and if, as a result of the determination, the second erase verification operation is determined to be the failure, raising the erase voltage by the step voltage, supplying the raised erase voltage to the P well, and performing the steps from the step of performing the first erase verification operation. - View Dependent Claims (8, 9)
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10. A nonvolatile memory device, comprising:
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a memory cell block configured to comprise a plurality of bit lines having a plurality of memory cells coupled thereto; a circuit group configured to erase the memory cell block; and a controller configured to control the circuit group, wherein the controller controls the circuit group so that the circuit group performs processes of; supplying an erase voltage to a P well of a semiconductor substrate having the memory cell block disposed therein, performing a first erase verification operation for verifying an erase state of memory cells, coupled to even bit lines of the plurality of bit lines, by supplying a verification voltage to relevant word lines of the memory cell block, if a result of the first erase verification operation is determined to be failure, raising the erase voltage by a step voltage and supplying the raised erase voltage to the P well, performing a second erase verification operation for verifying an erase state of memory cells, coupled to odd bit lines of the plurality of bit lines, and if a result of the second erase verification operation is determined to be failure, raising the erase voltage by the step voltage, supplying the raised erase voltage to the P well, and performing the processes from the process of performing the first erase verification operation. - View Dependent Claims (11)
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12. A nonvolatile memory device, comprising:
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a memory cell block configured to comprise a plurality of even and odd bit lines having a plurality of memory cells coupled thereto; a page buffer unit coupled to the plurality of even and odd bit lines and configured to detect verification data of the plurality of memory cells; and a voltage generator configured to supply a verification voltage to word lines of the memory cell block and supply an erase voltage to a P well of a semiconductor substrate having the memory cell block disposed therein, wherein after the voltage generator supplies the erase voltage to the P well, the page buffer unit performs an erase verification operation for memory cells coupled to the even bit lines, from among the plurality of memory cells, and if a result of the erase verification operation is determined to be success, performs the erase verification operation for memory cells coupled to the odd bit lines, from among the plurality of memory cells. - View Dependent Claims (13, 14)
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Specification