This paper discusses the aspects and associated requirements of design and implementation of at-speed scan testing. It also demonstrates some important vector generation and implementation procedures based on a real design.

An innovative method of scan pattern timing creation based on the results from Static Timing Analysis is presented. The paper also describes the usage of a clock control module on J750 tester, which creates fast clock by combining two tester channels with high edge placement accuracy.

These methods allow a short test pattern preparation time and the use of low-cost test equipment, while providing the high quality at-speed testing.