What to do with pin 9/T_JCLK of STLINK-V3MINIs 14pin connector

[LMI2]

I have STM32H750 100pin chip and STLINK-V3MINI. Pin 9 of mini 14 pin connector has no obvious place on the chip. There is already a JTCK/SWCLK signal between 6/14 and PA14/STM32H.

I am using AN4938 table 6 and UM2502 also table 6 to connect debug pins.

[Tesla DeLorean]

On the typical ARM 10-pin, that's the KEY pin (missing), perhaps there is a JTAG variant of the cable/connector where this is the same as JTCK, or it provides a second clock for another chain/device.

I'd focus on SWCLK, SWDIO, SWO and NRST signals.

[LMI2]

Yes, I have SWCLK, SWDIO, SWO and NRST signals handled. T_JCLK is just last "unhandled exception" in that connector.