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iMX6DL with AR8031 Ethernet phy - power pins and the Pins Tool

Question asked by Ian Dennis on Aug 21, 2017
Latest reply on Sep 12, 2017 by Artur Petukhov

We are designing a custom iMX6 board targetting DL, D and Q parts.  We have based our design on the SDB EVM and we are using the AR8031 phy (is this still recommended?).  We have NVCC_ENET connected to 3V3 and NVCC_RMGII connected to 1V5 as regulated by the AR8031's VDDIO_REG on-board regulator, both as per the SDB schematic.  But using the Pins 3.0 software tool, if we check both the MDIO/MDC and RGMII pins within the ENET peripheral, and nominate the above voltages in the Power Groups tab, then 'Power group conflict' warnings are generated, apparently because the NVCC_ENET and NVCC_RMGII voltages are not the same. Am I misunderstanding the Pins tool, or are these power connections wrong?  Any advice gratefully received. Thank you.