Integrated circuit test optimization using adaptive test pattern sampling algorithm
First Claim
1. A method of implementing integrated circuit device testing using adaptive test pattern selection, the method comprising:
- performing an initial baseline testing of a first group of chips to be tested using a full set of test patterns;
for each of the first group of chips identified as failing at least one of the full set of test patterns, determining, by a computing device, a score for each test pattern in the full set, the score indicative of an ability of the test pattern to uniquely identify a failing chip with respect to other test patterns, and keeping a running average of the score for each test pattern as subsequent failed chips are identified;
following the initial baseline testing, performing streamlined testing on a second group of chips for a first duration, the streamlined testing comprising using a reduced set of the test patterns, the reduced set comprising test patterns having highest scores as determined by the initial baseline testing;
following the streamlined testing, performing full testing on a third group of chips for a second duration, the full testing comprising using the full set of the test patterns and, during the full testing, resuming determining a score for each test pattern in the full set for each failing device in the third group of chips and updating the running average of the score for each test pattern; and
alternating between the streamlined testing and the full testing for additional groups of chips.
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Abstract
A method of implementing integrated circuit device testing includes performing baseline testing of a first group of chips using a full set of test patterns, and for chip identified as failing, determining, a score for each test pattern in the full set. The score is indicative of an ability of the test pattern to uniquely identify a failing chip with respect to other test patterns. Following the baseline testing, streamlined testing on a second group of chips is performed, using a reduced set of the test patterns having highest average scores as determined by the baseline testing. Following the streamlined testing, full testing on a third group of chips is performed using the full set of test patterns, and updating the average score for each pattern. Further testing alternates between the streamlined testing and the full testing for additional groups of chips.
23 Citations
20 Claims
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1. A method of implementing integrated circuit device testing using adaptive test pattern selection, the method comprising:
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performing an initial baseline testing of a first group of chips to be tested using a full set of test patterns; for each of the first group of chips identified as failing at least one of the full set of test patterns, determining, by a computing device, a score for each test pattern in the full set, the score indicative of an ability of the test pattern to uniquely identify a failing chip with respect to other test patterns, and keeping a running average of the score for each test pattern as subsequent failed chips are identified; following the initial baseline testing, performing streamlined testing on a second group of chips for a first duration, the streamlined testing comprising using a reduced set of the test patterns, the reduced set comprising test patterns having highest scores as determined by the initial baseline testing; following the streamlined testing, performing full testing on a third group of chips for a second duration, the full testing comprising using the full set of the test patterns and, during the full testing, resuming determining a score for each test pattern in the full set for each failing device in the third group of chips and updating the running average of the score for each test pattern; and alternating between the streamlined testing and the full testing for additional groups of chips. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A computer program product comprising a non-transitory, tangible computer readable medium having computer readable instructions stored thereon that, when executed by a computer, implement a method of testing an integrated circuit device by using adaptive test pattern selection, the method comprising:
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performing an initial baseline testing of a first group of chips to be tested using a full set of test patterns; for each of the first group of chips identified as failing at least one of the full set of test patterns, determining a score for each test pattern in the full set, the score indicative of an ability of the test pattern to uniquely identify a failing chip with respect to other test patterns, and keeping a running average of the score for each test pattern as subsequent failed chips are identified; following the initial baseline testing, performing streamlined testing on a second group of chips for a first duration, the streamlined testing comprising using a reduced set of the test patterns, the reduced set comprising test patterns having highest scores as determined by the initial baseline testing; following the streamlined testing, performing full testing on a third group of chips for a second duration, the full testing comprising using the full set of the test patterns and, during the full testing, resuming determining a score for each test pattern in the full set for each failing device in the third group of chips and updating the running average of the score for each test pattern; and alternating between the streamlined testing and the full testing for additional groups of chips. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system for implementing integrated circuit device testing using adaptive test pattern selection, comprising:
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a computing network including a processing device in communication with one or more computer memory storage devices; and the processing device configured to; perform an initial baseline testing of a first group of chips to be tested using a full set of test patterns; for each of the first group of chips identified as failing at least one of the full set of test patterns, determine a score for each test pattern in the full set, the score indicative of an ability of the test pattern to uniquely identify a failing chip with respect to other test patterns, and keeping a running average of the score for each test pattern as subsequent failed chips are identified; following the initial baseline testing, perform streamlined testing on a second group of chips for a first duration, the streamlined testing comprising using a reduced set of the test patterns, the reduced set comprising test patterns having highest scores as determined by the initial baseline testing; following the streamlined testing, perform full testing on a third group of chips for a second duration, the full testing comprising using the full set of the test patterns and, during the full testing, resume determining a score for each test pattern in the full set for each failing device in the third group of chips and updating the running average of the score for each test pattern; and alternate between the streamlined testing and the full testing for additional groups of chips. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification