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.
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.
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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.
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