What is the difference between ST-LINK and JTAG?

[YShko.1]

I read on the intenet that they both are used to debug the IC.

But how they differ?

thanks

[S.Ma]

ST-Link is a hardware debug probe, as J-Link and I-Jet.

Most debug probe support 2 type of debug bus, the standard JTAG and the Arm 2+ wire SWD interface. Some debug probe support additonal debug feature such as virtual port com, trace, etc....

[YShko.1]

Hey,

So base on your answare ST-LINK is a hardware debug probe which has a JTAG bus?

[Sarra.S]

Hello @YShko.1​,

ST-Link is a hardware debug probe

JTAG is a standard protocol.

ST-Link is used to debug STM32 microcontrollers while JTAG is a standard protocol used to debug a wide range of microcontrollers.

 You can also refer to this AN4989 to learn more about it!

Hope that helps!