CM5 B2B Connector Orientation

#1

I’m trying to build a carrier board for the CM5 but I’m struggling to determine the orientation of the ‘extra’ 100-pin board-to-board header.

Raspberry Pi labels the pins at each corner of their CM4 connectors:

pi_pins
pi_pins.png1151×1038 98 KB

I’d expect to see something similar for the Radxa CM5:

radxa_pins
radxa_pins.png666×776 171 KB

I tried looking at the CM4IO board CAD files but I don’t have Altium and they won’t load in Altium’s online viewer.

Does anyone know where pin 1 is on the third b2b connector?

#2

See the carrier board layout.

#3

@3djelly, I mentioned being unable to look at the carrier board yet you then advise to look at the carrier board?

It’s ok though because the OrangePi community helped us out in a chat channel. The answer is:

answer
answer.jpg1279×1506 308 KB

It would be great to add this to the CM5 datasheet so we can get closer to Raspberry Pi quality.