Compute Module • JTAG on CM5

I am looking for JTAG pins on CM5 module, found the test points in datasheet page 37. But unable to identify test points TP48, TP49 , TP50, TP51 & TP52 on the board, because CM5 board dont have silkscreen on it. Kindly help how i can identify this.

Also, I am aware of SWD whcih is on the top side of CM5, it has test points and connector mount pads available on the board. I have referred "viewtopic.php?p=2287816&hilit=JTAG+on+CM5#p2287816", My understanding is that there is no other way to connect the SWD other than one on the CM5 module (I mean there are no other GPIO pins or UART pins which support SWD. Also CM5 i/o board dont has this debug option, 200 pin connector of SOM module which interconnects i/o board don't have debug pins). Correct me If I am wrong?

But in my case, I have to use 5 pin JTAG, how i need to extract JTAG pins from the CM5?

I have seen some sources saying CM5 has below alternative JTAG pins , Is that correct ?

The BCM2712 SoC on the CM5 provides two sets of JTAG signals as alternate functions on various GPIO pins.
* JTAG Alt1:
* GPIO 4: TDI (Test Data In)
* GPIO 5: TDO (Test Data Out)
* GPIO 6: RTCK (Return Test Clock) - This is an optional but often useful pin for adaptive clocking.
* GPIO 12: TMS (Test Mode Select)
* GPIO 13: TCK (Test Clock)
* JTAG Alt2:
* GPIO 22: TRST (Test Reset) - This is an optional reset for the JTAG logic.
* GPIO 23: RTCK (Return Test Clock)
* GPIO 24: TDO (Test Data Out)
* GPIO 25: TCK (Test Clock)
* GPIO 26: TDI (Test Data In)
* GPIO 27: TMS (Test Mode Select)

Statistics: Posted by TEJA00432328 — Thu Jul 03, 2025 8:30 am

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