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60 DESIGN007 MAGAZINE I JANUARY 2024 Feature Interview by Andy Shaughnessy I-CONNECT007 Bert Horner, president of e Test Con- nection, Inc. (TTCI) in Hunt Valley, Mary- land, has been helping PCB designers address design-for-test challenges, as well as the need to consider DFT early in the design cycle. I asked him to discuss some of the DFT issues that PCB designers need to be more aware of, and what designers can do to help PCB manu- facturers avoid test problems farther down the line. As Bert says, many DFT snafus could be avoided if designers had a better understand- ing of the actual testing process. Andy Shaughnessy: Bert, what are some things that designers need to know about designing for test? Bert Horner: Of course, test is an integral part of the manufacturing process. Oen, designers will design a board that works, but it may only work in a lab or a non-production environ- ment. With DFT, there are really only a couple of key things that you'll need to consider. One is the controllability of parts; you want to be able to disable, control tri-state, and do cer- tain things to have controllability of the card as What Designers Should Know About Test