On the internet, it always shows that each pin of the IC has its own Boundary Scan register (the yellow boxes)


But looking at BSDL files there are actually more BS registers than pins.

So for the questions:

  1. Is it right to say that there are always more BS registers than pins?
  2. What are the other BS registers used for OR Why are they there?
  3. How can we use JTAG(TAP controller, state machine etc) to find out which are the pin's BS register?


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.