Method for microprocessor test insertion reduction
View Patent ↗Methods for reducing the requirement for multiple test vector sub-set insertions of a test vector set on test equipment having a limited memory size. In one embodiment, a single, selective test vector sub-set is utilized in the pre-burn-in test phase of microprocessors and multiple test vector sub-set insertions of a test vector set are utilized in the post-burn-in test phase. In one embodiment, the single, selective test vector sub-set includes selected test vectors from some or all of the test vector sub-sets used in the post-burn-in test phase and is sized to fit within the fixed memory capacity of the test equipment. In another embodiment, a single, selective test vector sub-set is utilized in both the pre-burn and post-burn test phases.
1. A method for testing one or more microprocessors for defects on test equipment having a fixed memory capacity, the method comprising:
loading a single, selective test vector sub-set into a fixed memory of test equipment, the selective test vector sub-set further comprising one or more selected test vectors, the selective test vector sub-set being less than or equal to the memory capacity of the test equipment;
executing the selective test vector sub-set on the test equipment prior to burning in the one or more microprocessors, execution of the selective test vector sub-set causing the test equipment to test the microprocessors with the one or more selected test vectors;
executing a burn-in of the one or more microprocessors;
after burning in the one or more microprocessors, loading a first test vector sub-set into the fixed memory of the test equipment, the first test vector sub-set being one segment of a test vector set, the first test vector sub-set further comprising a first sub-set of test vectors;
executing the first test vector sub-set on the test equipment, execution of the first test vector sub-set causing the test equipment to test the one or more microprocessors with the first sub-set of test vectors;
loading a second test vector sub-set into the fixed memory of the test equipment, the second test vector sub-set being another segment of the test vector set, the second test vector sub-set further comprising a second sub-set of test vectors; and
executing the second test vector sub-set on the test equipment, execution of the second test vector sub-set causing the test equipment to test the one or more microprocessors with the second sub-set of test vectors.
2. The method of claim 1 , further comprising:
after executing the second test vector sub-set on the test equipment, loading a third test vector sub-set into the fixed memory of the test equipment, the third test vector sub-set being a further segment of the test vector set, the third test vector sub-set further comprising a third sub-set of test vectors; and
executing the third test vector sub-set on the test equipment, execution of the second test vector sub-set causing the test equipment to test the one or more microprocessors with the third sub-set of test vectors.
3. The method of claim 2 , wherein the selected test vectors are selected from some or all of the first, second and third test vector sub-sets.
4. The method of claim 1 , wherein the selected test vectors are statistically selected.
5. The method of claim 1 , wherein the selected test vectors are test vectors that detect errors above a specified statistical frequency threshold and that fit within the memory size of the test equipment.
6. The method of claim 1 , wherein the selected test vectors are selected from some or both of the first and second test vector sub-sets.
7. The method of claim 1 , wherein the selected test vectors are selected from the test vector set.
8. A method for testing one or more microprocessors for defects on test equipment having a fixed memory capacity, the method comprising:
loading a single, selective test vector sub-set into a fixed memory of test equipment, the selective test vector sub-set further comprising one or more selected test vectors, the selective test vector sub-set being less than or equal to the memory capacity of the test equipment;
executing the selective test vector sub-set on the test equipment prior to burning in the one or more microprocessors, execution of the selective test vector sub-set causing the test equipment to test the microprocessors with the one or more selected test vectors;
executing a burn-in of the one or more microprocessors;
loading the single, selective test vector subset into the fixed memory of the test equipment; and
executing the selective test vector sub-set on the test equipment after burning in the one or more microprocessors, execution of the selective test vector sub-set causing the test equipment to test the microprocessors with the one or more selected test vectors.
9. The method of claim 8 , wherein the selected test vectors are statistically selected.
10. The method of claim 9 , wherein the selected test vectors are test vectors that detect errors above a specified statistical frequency threshold and that fit within the memory size of the test equipment.
11. The method of claim 8 , wherein the selected test vectors are selected from a test vector set.