The Boundary-Scan Handbook by Kenneth P. Parker

Author:Kenneth P. Parker
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

7.5.3 System Level

At the system level, it may be important to make analog measurements utilizing the analog test facilities of 1149.4. Or, it may not! This is a strong function of what a “system” looks like and what type of analog measurements may be required of the system. The full suite of analog measurements of interest at board test may be overkill at system test. This will determine how many ATn ports need to be made accessible to a system level analog stimulus/measurement facility.

My favorite hypothetical example comes from the automotive industry. The engine control system for an automobile could be implemented with 1149.1/1149.4 technology to support system level testing and diagnosis. Interconnect tests would be very important since it is well known that interconnections (cabling and connectors) in cars are a weak point. Though there may be many analog components too, it may be too difficult (expensive) to make analog measurements on all of these if doing so requires routing several ATn domains back to a central analog stimulus and measurement resource. However, certain analog devices may be wear items that are expected to degrade in time. These could be serviced with a port while most other items are not. DFT-34: Consider which of all ATn ports in a system will be needed for system test and provide access to them.

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