What is the T_SW_DIR pin on STLINK-V3?

[sean123]

I can't find any information about what the T_SW_DIR pin is on the STLINK-V3 products. I am planning to use a STLINK-V3MODS programmer in a project, but I can't find any other information about this pin, other than it is an output. Does anyone know what it is and what it's used for?

[Tesla DeLorean]

Would expect it reports the direction of the SWDIO pin to buffering circuitry, either level convertors or isolation

[Franksterb92]

here is a reference design for a voltage translator circuit from st and if you look at the jtag section on page 3 it is used as a direction control

https://www.st.com/resource/en/hw_model/stlink-v3mods_voltage-translator_reference-design.pdf

[Franksterb92]

the stlink v3 mods is really great but i wish they would make a version without the usb connector soldered on and break out the usb input