AR# 67103

Description

How is the VADJ rail treated on UltraScale Boards and Kits?

Solution

For UltraScale Boards and Kits, the process for VADJ read as defined in VITA57.1 FMC specification is followed.

This involves the querying of the Mezzanine Card's EPROM to ensure that the VADJ voltage is brought up at the correct voltage.

The Maxim Integrated power controllers on the UltraScale Boards and Kits power on with VADJ off by design.

VADJ gets enabled by the MSP430 System Controller after power-on under the following conditions (1 or 2 or 3):

1. If no FMC cards are plugged into the UltraScale board FMC connectors


2. If one FMC card is plugged into either of the 2 FMC connectors on the UltraScale board
   AND
   Proper IPMI format defined in VITA57.1 FMC specification is programmed into the Mezzanine Card's EPROM
   AND
   The Mezzanine Card's IPMI data defines a compatible VADJ voltage (range) with the UltraScale board's VADJ capability


3. If two FMC cards are plugged into the two UltraScale board FMC connectors
   AND
   Proper IPMI format defined in the VITA57.1 FMC specification is programmed into both of the Mezzanine Card's EPROMs
   AND
   Both Mezzanine Card's IPMI data defines a VADJ voltage (range) compatible with the UltraScale board's VADJ capability

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