Which statement about boundary scan tests is accurate?

Which statement about boundary scan tests is accurate?

• A. They detect only power supply issues.
• B. They test software interfaces for faults.
• C. They measure processor clock speed.
• D. Boundary scan tests device I/O lines and interconnects to detect faults in traces/pins.

Answer: (D)

Boundary scan testing is a hardware-level diagnostic that exercises the connections at a device’s boundaries—the I/O pins and their interconnects. By shifting test data through boundary scan cells around each pin, faults such as opens or shorts in traces and pins can be detected without specialized fixtures. This is exactly the idea behind testing device I/O lines and their interconnects to find faults in traces and pins, which is why that statement is the correct one. It isn’t about only power issues, software interfaces, or measuring clock speed.

Boundary scan testing is a hardware-level diagnostic that exercises the connections at a device’s boundaries—the I/O pins and their interconnects. By shifting test data through boundary scan cells around each pin, faults such as opens or shorts in traces and pins can be detected without specialized fixtures. This is exactly the idea behind testing device I/O lines and their interconnects to find faults in traces and pins, which is why that statement is the correct one. It isn’t about only power issues, software interfaces, or measuring clock speed.