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A link used to transfer test data (applied vectors or results) between the Test Controller and the device(s) involved in the test, adhering to the Capture-Shift-Update flow. There may be more than one data link per device in the SJTAG domain and data links may be unidirectional or bidirectional.
See also: Access Link
Source: Insert link to source of definition or "Internal" if SJTAG defined.