boundary scan

from The Free On-line Dictionary of Computing (8 July 2008)

boundary scan

   The use of {scan registers} to capture state from device input
   and output pins.  {IEEE} Standard 1149.1-1990 describes the
   international standard implementation (sometimes called JTAG
   after the Joint Test Action Group which began the
   standardisation work).

   (1995-02-14)