My assembly is the AUBOARD 15P + Analog Devices AD-FMCOMMS4 RF board plugged in via the FMC connector.
An essential signal on the AUBOARD 15P is the PG_C2M (power good to mezzanine) to enable the power on the RF board.
I could not find any documentation as to how to enable this signal (any jumper, resistor/??)
More generally, the AUBOARD 15P schematics would be extremely helpful.
The D29 LED is off (meaning PG_C2M is 0).
Any help will be greatly appreciated
You have a couple of options here. The PG_C2M circuit looks like the following:
You could use R226 pullup to drive PG_C2M and populate it with something under 1K-ohms. This would pullup PG_C2M when the 3V3_UTIL (which is used to create +FMC_12V). This would get you passed your issue.
A more accurate PG_C2M would be created by using POWER_GOOD on the board which is driven after +VCCO_66_86. The POWER GOOD signal is on 0-ohm RES R590 which is on the back of the board.
The problem here is that the POWER_GOOD R590 resistor is across the board with respect to PG_C2M signal.
