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<p>A broad-level implementation of signature analysis that uses a built-in test module called a testing switch is presented. It is shown how board designers can incorporate the testing-switch modules to reduce the time it takes to isolate faulty chips. Both the test time and the power overhead are better with the testing-switch implementation than with schemes using built-in logic block observer circuits. The proposed technique is especially useful when boundary scan and self-test cannot be implemented in every chip of a board.</p>

N. Vasanthavada and N. Kanopoulos, "A Built-In Test Module for Fault Isolation," in IEEE Design & Test of Computers, vol. 6, no. , pp. 58-65, 1989.
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