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JTAG without NJTRST

Question asked by Lukasz Przenioslo on Feb 16, 2016
Latest reply on Feb 17, 2016 by ogden1
Hello there,
I have a general question regarding the NJTRST signal in a JTAG protocol. In STM32 datasheets, I read that JTAG can operate with only 4 pins, without NJTRST. I only assume it then uses regular #RESET pin to acomplish the goal? Please correct me if I am wrong. Also in the specification, what is confusing for me, it doesnt say anywhere that the regular #RESET pin is needed at any point:

https://www.dropbox.com/s/j7ygboalkyuo6zs/Zrzut%20ekranu%202016-02-16%2008.14.08.png?dl=0

I would really apreciate if one could explain me briefly the difference between NJTRST and #RESET, how they are needed otr not for JTAG. I know that NJTRST is some kind of inner reset for JTAG logic.

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