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IEEE 1149.1 (JTAG)

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IEEE 1149.1 is the Standard Test Access Port and Boundary-Scan Architecture for test access ports used for testing printed circuit boards using boundary scan (BSDL). It is also used for application development. IEEE 1149.1 is also commonly known as JTAG (Joint Test Action Group).


IEEE 1149.7 is an compatible enhancement to IEEE 1149.1.


  • IEEE 1149.1 JTAG Testability Primer: SSYA002
  • JTAG/MPSD Emulation Technical Reference: SPDU079
  • Free commercial quality software (BSDL, pin toggle, access internal regs, tcl/tk scripting) at Free JTAG/1149.1

See Also