Memory devices and method for error test, recordation and repair
First Claim
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1. A memory device, comprising:
- an array of memory cells including a plurality of redundant memory cells for replacing memory cells of the array; and
an on-die device operably coupled with the array of memory cells and configured to store data associated with unavailability of a redundant memory cell, wherein the on-die device includes an anti-fuse bank configured to indicate the unavailability of the redundant memory cell with at least one blown anti-fuse and at least one non-blown anti-fuse of the anti-fuse bank.
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Abstract
In a memory device, an on-die register is provided that is configured to store a row address as well as a column address of a memory cell that fails a test. Storing the row address frees testing from being limited to activating at one time only rows related to a common redundant segment. Storing the row address also guides repair using segmented redundancy. As an addition or alternative, information may be stored in an anti-fuse bank that is designed to provide access to a redundant cell but has not yet enabled access to that cell. If the information stored in the anti-fuse bank relates to the failure of the redundant cell, such information may be used to avoid repairing with that redundant cell.
82 Citations
24 Claims
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1. A memory device, comprising:
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an array of memory cells including a plurality of redundant memory cells for replacing memory cells of the array; and an on-die device operably coupled with the array of memory cells and configured to store data associated with unavailability of a redundant memory cell, wherein the on-die device includes an anti-fuse bank configured to indicate the unavailability of the redundant memory cell with at least one blown anti-fuse and at least one non-blown anti-fuse of the anti-fuse bank. - View Dependent Claims (2, 3)
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4. A memory device, comprising:
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an array of memory cells including a plurality of redundant memory cells for replacing memory cells of the array; and an on-die device operably coupled with the array of memory cells and configured to store data associated with unavailability of a redundant memory cell, wherein the data includes at least one bit associated with an address of the redundant memory cell and at least one bit associated with an enable of the redundant memory cell.
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5. A memory device, comprising:
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an array of memory cells including a plurality of redundant memory cells for replacing memory cells of the array; and an on-die device operably coupled with the array of memory cells and configured to store data associated with unavailability of a redundant memory cell, wherein the data includes at least one bit associated with which test the redundant memory cell failed. - View Dependent Claims (6)
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7. A memory device, comprising:
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a memory array on a semiconductor die; a plurality of programmable devices on the semiconductor die associated with a plurality of redundant memory cells; and control circuitry operably coupled with the memory array and the plurality of programmable devices, the control circuitry configured to refrain from using a particular redundant memory cell of the plurality of redundant memory cells when an associated programmable device indicates the particular redundant memory cell of the plurality to be unavailable, wherein the associated programmable device includes; a first programmable device corresponding to at least a portion of a memory address of a particular redundant memory cell; and a second programmable device corresponding to enablement of the particular redundant memory cell. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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- 15. A method, comprising signifying unavailability of a redundant memory cell of a memory array with an on-die device for replacement of a main memory cell of the memory array, wherein signifying unavailability of the redundant memory cell includes blowing at least one anti-fuse in a redundancy circuit while maintaining an anti-fuse of an enable redundancy circuit.
- 18. A method, comprising signifying unavailability of a redundant memory cell of a memory array with an on-die device for replacement of a main memory cell of the memory, wherein signifying unavailability of the redundant memory cell includes blowing at least one anti-fuse corresponding to an address bit of the redundant memory cell without blowing an anti-fuse corresponding to an enable bit of the redundant memory cell.
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20. A method. comprising:
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signifying unavailability of a redundant memory cell of a memory array with an on-die device for replacement of a main memory cell of the memory; a first testing of a plurality of redundant memory cells for identifying a failed redundant memory cell prior to complete packaging; and retaining a result of the testing in the on-die device for subsequent testing that occurs at a later fabrication stage than a fabrication stage of the first testing. - View Dependent Claims (21)
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Specification