Apparatuses and methods for controlling refresh operations
First Claim
1. A method comprising:
- receiving a first command to enter a target-row refresh mode;
receiving a second command and a third command during the target-row refresh mode, wherein the second command is accompanied by first address information designating a first word line of a plurality of word lines in a memory array, wherein the third command is accompanied by the first address information designating the first word line, and wherein the plurality of word lines further includes a second word line that is proximate to the first word line; and
performing, responsive to the second command and the third command, a refresh operation on the memory array by;
responsive to the second command, activating the first word line; and
responsive to the third command, activating the second word line if the second word line is functional and not activating the second word line if the second word line is not functional.
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Accused Products
Abstract
An apparatus includes a first word line, a second word line and a control. The second word line is contiguous to the first word line. The control circuit includes a first defective address storing circuit and a fast detection circuit. The first defective address storing circuit stores first enable information along with first defective address. The first enable information indicates whether or not the second word line is functional. The first detection circuit provides a first signal when the first word line is accessed. The first signal indicates whether or not the second word line is functional. The control circuit activates the second word line when the first signal indicates that the second word line is functional and does not activate the second word line when the first signal indicates that the second word line is not functional.
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Citations
33 Claims
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1. A method comprising:
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receiving a first command to enter a target-row refresh mode; receiving a second command and a third command during the target-row refresh mode, wherein the second command is accompanied by first address information designating a first word line of a plurality of word lines in a memory array, wherein the third command is accompanied by the first address information designating the first word line, and wherein the plurality of word lines further includes a second word line that is proximate to the first word line; and performing, responsive to the second command and the third command, a refresh operation on the memory array by; responsive to the second command, activating the first word line; and responsive to the third command, activating the second word line if the second word line is functional and not activating the second word line if the second word line is not functional. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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receiving a first command to enter a target-row refresh mode; receiving a second command and a third command during the target-row refresh mode, wherein the second command is accompanied by first address information designating a first word line of a plurality of word lines in a memory array, wherein the plurality of word lines further includes a second word line that is proximate to the first word line, and wherein enable information indicating whether the second word line is used or not used is stored before entering the target-row refresh mode; and performing a refresh operation on the memory array by activating the first or second word line responsive to the second or third command, respectively. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A method comprising:
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receiving a first command to enter a target-row refresh mode; receiving a second command and a third command during the target-row refresh mode, wherein the second command is accompanied by first address information designating a first word line of a plurality of word lines in a memory array, wherein the third command is accompanied by the first address information designating the first word line, and wherein the plurality of word lines further includes a second word line that is proximate to the first word line; and performing, responsive to the second command and the third command, a refresh operation on the memory array, wherein enable information used to cause the second word line to be activated is stored before entering the target-row refresh mode. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. A method comprising:
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receiving a first command to enter a target-row refresh mode; receiving a second command and a third command during the target-row refresh mode, wherein the second command is accompanied by first address information designating a first word line of a plurality of word lines in a memory array, wherein the third command is accompanied by the first address information designating the first word line, wherein the plurality of word lines further includes a second word line and a third word line, wherein the second word line is proximate to the first word line, and wherein the third word line is proximate to the first word line so that the first word line is sandwiched between the second word line and the third word line; and performing, responsive to the second command and the third command, a refresh operation on the memory array by; responsive to the second command, activating the second word line if the second word line is functional and not activating the second word line if the second word line is not functional; and responsive to the third command, activating the third word line if the third word line is functional and not activating the third word line if the third word line is not functional. - View Dependent Claims (28, 29, 30, 31, 32)
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33. An apparatus comprising:
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a memory array comprising a plurality of word lines, the plurality of word lines including first, second and third word lines, the second word line being proximate to the first word line, and the third word line being proximate to the first word line so that the first word line is sandwiched between the second word line and the third word line; a command/address circuit configured to, during a target-row refresh mode, receive first, second and third commands, each of the first, second and third commands being accompanied by first address information designating the first word line; and a refresh control circuit configured to; responsive to the first command, activate the first word line, responsive to the second command, activate the second word line if the second word line is functional and not activate the second word line if the second word line is not functional, and responsive to the third command, activate the third word line if the third word line is functional and not activate the third word line if the third word line is not functional.
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Specification