Computer system predicting memory failure
First Claim
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1. An integrated circuit system comprising:
- a plurality of memory cells organized in groups and addressable to allow reading and writing of binary values to the memory cells;
a voltage control system independently applying a controllable voltage to the memory cells of different groups;
a memory reliability circuit communicating with the memory cells and voltage control system to, for a given group;
(a) reduce the voltage applied to the given group using the voltage control system to less than an operating voltage applied to other memory cells of other groups to simulate aging of the given group;
(b) write a test vector to the memory cells of the given group;
(c) read the test vector from the memory cells of the given group as a modified test vector change by any memory cell failure;
(d) compare the test vector to the modified test vector; and
(e) provide an output indicating predicted failure of the given group when the test vector does not match the modified test vector.
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Abstract
The prediction of memory failure is obtained by reducing the voltage on a bank of memory cells to momentarily artificially age the memory cells and subjecting the memory cells to a test in which one or more predetermined vectors are written to and read from the memory cells to detect memory cell errors.
11 Citations
18 Claims
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1. An integrated circuit system comprising:
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a plurality of memory cells organized in groups and addressable to allow reading and writing of binary values to the memory cells; a voltage control system independently applying a controllable voltage to the memory cells of different groups; a memory reliability circuit communicating with the memory cells and voltage control system to, for a given group; (a) reduce the voltage applied to the given group using the voltage control system to less than an operating voltage applied to other memory cells of other groups to simulate aging of the given group; (b) write a test vector to the memory cells of the given group; (c) read the test vector from the memory cells of the given group as a modified test vector change by any memory cell failure; (d) compare the test vector to the modified test vector; and (e) provide an output indicating predicted failure of the given group when the test vector does not match the modified test vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of predicting memory cell failure in an integrated circuit system having a plurality of memory cells organized in groups and addressable to allow reading and writing of binary values to the memory cells and having a voltage control system independently applying a controllable voltage to the memory cells of the different groups, the method comprising the steps of:
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(a) reducing the voltage applied to the given group using the voltage control system to less than an operating voltage applied to other memory cells of other groups to simulate aging of the given group; (b) writing a test vector to the memory cells of the given group; (c) reading the test vector from the memory cells of the given group as a modified test vector changed by any memory cell failure; (d) comparing the test vector to the modified test vector; and (e) providing an output indicating predicted failure of the given group when the test vector does not match the modified test vector.
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Specification