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"The boundary scan register serves the purpose of capturing data in the boundary scan cells, which involves monitoring the input pins. This data can be scanned out of the device through the TDO pin for verification, and it can also be scanned into the device through the TDI pin. By doing so, the tester is able to verify the data on the output pins of the device."
<https://www.besterpcba.com/what-is-boundary-scan/>